US20040233099A1 - System for receiving multiple independent rf signals having different polarizations and scan angles - Google Patents
System for receiving multiple independent rf signals having different polarizations and scan angles Download PDFInfo
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- US20040233099A1 US20040233099A1 US10/346,231 US34623103A US2004233099A1 US 20040233099 A1 US20040233099 A1 US 20040233099A1 US 34623103 A US34623103 A US 34623103A US 2004233099 A1 US2004233099 A1 US 2004233099A1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/0087—Apparatus or processes specially adapted for manufacturing antenna arrays
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/24—Combinations of antenna units polarised in different directions for transmitting or receiving circularly and elliptically polarised waves or waves linearly polarised in any direction
Definitions
- This invention relates generally to active array RF systems and more particularly to a receiver capable of simultaneously receiving N independent RF input signals, which can respectively have different, scan angles and be circularly or linearly polarized.
- the present invention is directed to a wideband receiver system capable of simultaneously receiving multiple independent polarized (linearly or circularly) RF input signals from multiple sources within a wide scan angle range.
- Embodiments of the invention are suitable for a wide range of military and commercial application.
- the exemplary embodiment described herein is particularly suited for receiving input signals within the X/Ku band, e.g., between 10.9 and 15.35 Ghz.
- a preferred receiver in accordance with the invention utilizes first and second linear orthogonal radiators for respectively receiving composite signals RF X and RF Y .
- Each of the composite signals can contain multiple independent RF input signals, e.g., F 1 at a frequency of f 1 , F 2 at a frequency of f 2 , . . . FN at frequency fN.
- the RF X and RF Y components are then uniquely paired and processed in a polarization compensation stage by selective phase shifting based on the known polarization (e.g., left hand circular, right hand circular, linear 0-90°/180°-270°, and linear 90°-180°/270°-360°) of the signals to be received to produce four coherent signals, i.e., RF XY1 , RF XY2 , RF XY3 , RF XY4 . These four coherent signals are then selectively phase shifted in a scan angle compensation stage to recover the input signals F 1 , F 2 , F 3 , F 4 . The recovered input signals are then preferably band pass filtered.
- the known polarization e.g., left hand circular, right hand circular, linear 0-90°/180°-270°, and linear 90°-180°/270°-360°
- the composite signal RF X is applied to a four way divider which produces the four signals components RF X1 , RF X2 , RF X3 , RF X4 .
- the composite signal RF Y is applied to a four way divider to produce the signal components RF Y1 , RF Y2 , RF Y3 , RF Y4 .
- Each signal component contains contributions from the four input signals F 1 , F 2 , F 3 , F 4 .
- the RF X signal components are then respectively passed through controllable 90° phase shift branches and the RF Y signal components are respectively passed through controllable 180° phase shift branches.
- each 90° phase shift branch is uniquely paired with an output from a 180° phase shift branch and then summed in one of four two-way combiners to produce a coherent output.
- the 90° and 180° phase shift branches are digitally controlled to define a desired polarization angle, i.e., right hand circularly polarized, left hand circularly polarized, or linearly polarized, for each branch pairing.
- the following table describes an exemplary two bit control of the polarization phase shifters for each branch pairing for each polarity condition: POLARITY 90° shifter 180° shifter Right Hand Circular ON OFF Left Hand Circular ON ON Linear 0°-90°/180°-270° OFF OFF Linear 90°-180°/270°-360° OFF ON
- the coherent outputs of the four two-way combiners are then respectively applied to four digitally controlled phase shifters to compensate for scan angle. More particularly, the output of the first two-way combiner processing signals RF X1 and RF Y1 is applied to a first phase shifter which is digitally controlled to define the scan angle of the input signal F 1 . Similarly, the outputs of the second, third and fourth two-way combiners are respectively applied to the second, third and fourth phase shifters which are respectively digitally controlled to define the scan angles of signals F 2 , F 3 , F 4 .
- the outputs from the scan angle phase shifters which comprise the received input signals F 1 , F 2 , F 3 , F 4 , are then preferably passed through band filters respectively tuned to f1, f2, f3, f4.
- a preferred implementation of a receiver in accordance with the invention utilizes multiple substrates configured for stacking into a compact substrate assembly.
- the preferred substrate assembly includes six substrates or layers configured as follows:
- the substrates are connected vertically preferably using fuzz-button interconnects, and caged via hole technology.
- the preferred substrate assembly comprises a sixteen channel device. That is the Radiator/Balun substrate forms a sixteen element matrix in which each element contains orthogonally polarized radiators for supplying composite signals RF X and RF Y . Each element is coupled through the layers of the stack assembly forming the aforedisccussed receiver to recover four input signals F 1 , F 2 , F 3 , F 4
- FIG. 1 is a block diagram depicting the architecture of a receiver in accordance with the present invention
- FIG. 2 is a block diagram showing a preferred electronic implementation of the receiver architecture of FIG. 1;
- FIG. 3 is an exploded isometric illustration of a stack assembly implementing sixteen channels of an active array RF system where each channel can receive four independent RF input signals;
- FIG. 4 is an exploded isometric illustration of an exemplary layer of the stack assembly of FIG. 3.
- FIG. 1 generally depicts a receiver 100 in accordance with the invention for simultaneously receiving multiple independent RF input signals.
- the exemplary multiple input signals are represented in FIG. 1 as F 1 , F 2 , F 3 , F 4 and are shown as emanating from respective independent signal sources (s/s).
- the characteristics of the signal sources can vary widely depending on the application of the receiver 100 .
- the signal sources can be satellite based for use in a variety of commercial and direct-to-home systems for transferring broadcast television and/or internet and/or data signals.
- the signal sources can comprise aircraft, ships, and land based stations for providing communication therebetween.
- the input signals F 1 , F 2 , F 3 , F 4 will be presumed to be operating at frequencies f1, f2, f3, f4, respectively.
- Each independent input signal will also be presumed to be polarized, either linearly or circularly (right hand or left hand) and to be directed at a known scan angle relative to the receiver 10 .
- the intended function of the receiver 10 is to be able to simultaneously receive multiple input signals despite their exhibiting different scan angles and polarizations.
- a receiver in accordance with the invention will herein be described with reference to a preferred embodiment intended to handle received input signals in the 10.9 to 15.35 GHz range wherein each input signal can be circularly or linear polarized and can exhibit a scan angle within a range ⁇ 45° to +45° relative to the receiver.
- the receiver 10 is comprised of a first radiator 12 and a second radiator 13 mounted orthogonal to one another.
- the radiators 12 and 13 respectively yield composite output signals RF X and RF Y in response to the signal energy incident on the radiators.
- the composite signals RF X and RF Y each contain contributions from input signals F 1 , F 2 , F 3 , F 4 .
- the composite signal RF X is applied through a balun 14 to a low noise amplifier 15 .
- the composite signal RF Y is applied through a balun 16 to a low noise amplifier 17 .
- the output of low noise amplifier 15 is applied to divider circuit 18 which produces four substantially equal component signals RF X1 , RF X2 , RF X3 , RF X4 .
- the output of low noise amplifier 17 is coupled through divider circuit 19 to produce four substantially equal component signals RF Y1 , RF Y2 , RF Y3 , RF Y4 .
- the RF X and RF Y component signals are all applied to the input of a polarity compensation stage 20 .
- the polarity compensation stage 20 is comprised of multiple channels or branch pairs.
- Each branch pair 21 includes a 90° phase shift branch 22 and a 180° phase shift branch 23 .
- the RF X components supplied by divider 18 are respectively applied to different 90° phase shift branches 22 within the polarity compensation stage 20 .
- Each 90° phase shift branch 22 is depicted as including a digitally controllable 90° phase shifter 24 and one or more amplifier stages.
- the component outputs from divider 19 are respectively applied to different 180° phase shift branches 23 , each branch including a digitally controllable 180° phase shifter 25 and one or more amplifier stages.
- a digital controller 27 is provided for selectively controlling the states (i.e., on/off) of each of the phase shifters 24 , 25 in the polarity compensation stage 20 .
- states i.e., on/off
- four bits respectively control the four 90° phase shifters 24 .
- four bits respectively control the four 180° phase shifters 115 .
- Polarity compensation is effected in each branch pair accordance with the following table: POLARITY 90° shifter 180° shifter Right Hand Circular ON OFF Left Hand Circular ON ON Linear 0°-90°/180°-270° OFF OFF Linear 90°-180°/270°-360° OFF ON
- Operation in accordance with the foregoing table enables the polarity compensation stage 20 to phase align paired RF X and RF Y component signals to produce coherent output signals RF XY1 , RF XY2 , RF XY3 , RF XY4 from the respective branch pairs.
- Each branch pair output signal constitutes the sum of respective branch signals.
- These coherent branch pair output signals are then applied to different channels of a scan angle compensation stage 30 .
- the scan angle compensation stage 30 is depicted as being comprised of four channels, each channel 31 being comprised of a digitally controllable attenuator 32 connected in series with a digitally controllable phase shifter 33 .
- a twelve bit controller output (i.e., three bits per channel) 35 controls the four attenuators 32 .
- the attenuators function to balance the amplitudes on the multiple channels of compensation stage 30 .
- a sixteen bit controller output 36 controls the phase shifters 33 to define a scan angle for each channel.
- each coherent signal e.g., RF XY1
- applied to the scan angle compensation stage 30 will contain a dominant input signal dependent upon the angle of incidence of the input signal energy on the radiators.
- the polarity compensation stage 20 and the scan angle compensation stage 30 together process the composite signals supplied by the radiators 12 and 13 to recover the input signals F 1 , F 2 , F 3 , F 4 at the outputs of the phase shifters 33 .
- the outputs from the phase shifters 33 are preferably respectively directed through band pass filters 38 respectively tuned to the input signal frequencies, i.e., f1, f2, f3, f4.
- FIG. 3 illustrates a preferred structural implementation of the invention which comprises a sixteen channel substrate assembly 100 (sometimes called “Receive Tile”) for use in an active phased array antenna system for receiving four simultaneous input signals within the X/Ku band which can exhibit various scan angles and be variously polarized.
- FIG. 2 is a block diagram illustrating the functional circuitry for a single channel of the assembly 100 .
- the substrate assembly 100 shown in FIG. 3 is comprised of six substrates or layers, that are stacked on top of one another. An exploded view of a single exemplary substrate is shown in FIG. 4. These substrates technology to form the assembly 100 .
- the top substrate layer comprises a matrix 101 of sixteen radiator elements mounted adjacent to a balun substrate 102 . Each radiator element includes two orthogonal polarized square patch radiators. Each pair of orthogonal radiators makes possible the reception of variously polarized signals as described in connection with FIG. 1.
- the radiator matrix 101 is attached to the balun substrate 102 which preferably comprises a multilayer LTCC substrate.
- the balun substrate 102 is attached to an aluminum-graphite frame 103 , e.g., by film epoxy 113 (FIG. 4).
- the frame 103 supports the Fuzz-button interconnects 111 and enables vertical connection between the multiple substrates.
- the Fuzz-button interconnects 111 support the propagation of RF, DC and digital signals between the substrates.
- a low noise amplifier (LNA) substrate 104 below the radiator/balun substrate layer is a low noise amplifier (LNA) substrate 104 .
- This multilayer LTCC substrate has a strip line and a two-way divider 201 (FIG. 2) for inputting and outputting RF signals, respectively, to and from the low noise amplifier chip 300 .
- Sixteen low noise amplifier chips 300 are installed in the substrate 104 .
- the LNA chips are connected to the strip line and output divider by caged via holes 112 and strip lines.
- the DC signals are also delivered to the chip by the caged via holes.
- Each pair of orthogonal radiators of matrix 101 responds to incident signal energy by feeding the aforedisccussed composite signals RF X and RF Y to a low noise amplifier chip 300 .
- the outputs of the low noise amplifier chip are connected to a strip line divider 201 that divides the signal into two substantially equal component signals.
- the LNA chip 300 comprises a two-channel amplifier. Each channel is a five stage balanced low noise amplifier 301 that operates in 9.75 to 15.35 GHz frequency range.
- Each channel consists of a two stage low noise amplifier 302 with two Lang couplers 303 at input and output and a three stage buffer amplifier 304 with two Lang couplers 303 at input and output.
- the low noise amplifier chip 300 provides amplification for the composite input signals RF X and RF Y from the radiators to maintain the active array's low noise figure, high input return loss and wide bandwidth.
- the LNA substrate 104 is attached to an aluminum-graphite frame 105 using film epoxy 113 .
- the substrate 104 is then connected to the radiator/balun substrate 102 via Fuzz-button interconnection 111 .
- the assembly 100 further includes a first circular/linear polarization substrate 106 interconnected below the LNA substrate 104 .
- This multi-layer LTCC substrate 106 has a two-way divider 201 and a two-way combiner 202 for inputting and outputting RF signals, respectively, to and from a circular/linear polarization chip 400 in substrate 106 .
- Sixteen chips 400 are installed in the circular/linear polarization substrate 106 . These chips are connected to the input divider 201 and output combiners 202 via caged via holes 112 and strip lines. DC and digital signals are also delivered to the chip by the caged via holes.
- Each input divider on substrate 106 divides an output signal from the LNA substrate 104 to produce substantially equal component signals which are fed to the circular/linear polarization chip 400 .
- Each of the chips 400 includes digitally (one bit) controllable 90° phase shifters and digitally (one bit) controllable 180° phase shifters, as described in connection with FIG. 1.
- Each of the chips 400 also includes a serial to parallel converter (SPC) for converting a serial control stream to parallel control bits for controlling the phase shifters.
- the SPC devices are preferably implemented by gallium arsenide (GaAs) technology and integrated into the chip design. The integration of digital and RF circuits on the chips 400 enables the realization of high performance within a very compact physical package.
- the output combiners 202 on substrate 106 combine the output signals from the circular/linear polarization (CP/LP) chip 400 .
- the substrate 106 is attached to an aluminum-graphite frame 105 using film epoxy 113 .
- the CP/LP chip 400 is a four-channel receiver chip that is capable of simultaneously receiving two linearly or circularly polarized signals.
- Each of channels one and two consists of a two-stage amplifier 403 , a 90° phase shift 404 , and a one stage amplifier 405 .
- Each of channels three and four consists of a two-stage amplifier 406 , 180° phase shift 407 , and a one stage amplifier 408 .
- the four bit digital serial to parallel converter 409 uses three TTL signals to control the phase shifters bits that control the polarization angles of the received signals.
- Channels one and three receive the linear and orthogonal components of the first signal applied to chip 400 .
- Channels two and four receive the linear and orthogonal components of the second signal applied to chip 400 .
- the amplifier stages provide amplification for incoming signals.
- the control bits controlling of the 180° and 90° phase shifts enable phase alignment of the differently polarized received signals, as described in the previously presented table.
- the substrate 107 is substantially identical to substrate 106 and includes a two-way divider 201 and a two-way combiner 202 for inputting and outputting RF signals, respectively, to and from its circular/linear polarization chip 400 . Sixteen chips 400 are installed in the circular/linear polarization substrate 107 . It should be understood from FIG. 2 and the earlier discussion of FIG. 1 that substrate 106 produces coherent signals RF XY2 and RF XY3 and substrate 107 produces coherent signals RF XY1 and RF XY4 .
- the scan substrate 108 below the circular/linear polarization substrate 107 .
- This multilayer LTCC substrate has strip lines for inputting and outputting RF signals to and from the scan chips 500 .
- Sixteen scan chips 500 are installed in the scan substrate 108 . These chips are connected to the input and output strip lines via caged via holes 112 and strip lines. The DC and digital signals are also delivered to the chip 500 by the caged via holes. The four coherent output signals produced by the circular/linear polarization substrates 106 , 107 are fed to the scan chip 500 .
- Each of the scan chips 500 is comprised of four channels 501 where each channel includes a digitally (three bits) controllable attenuator 502 and a digitally (four bits) controllable phase shifter 504 as previously described in connection with FIG. 1.
- Each channel 501 consists of a three bit attenuator 502 and four bit phase shifter.
- Each three bit attenuator 502 has 0.5, 1 and 2 dB bits.
- Each four bit phase shifter 504 has 22.5°, 45°, 90° and 180° phase bits.
- Each chip 500 also includes a serial to parallel converter 507 for converting a serial twenty-eight bit stream to parallel bits for controlling the attenuators and phase shifters.
- the attenuators facilitate proper signal balancing and tapering for a phased array antenna to reduce side lobes.
- the scan chip 500 controls the scan angle of the receiver as described in connection with FIG. 1 and enables the receiver to receive signals with different scan angles.
- serial to parallel converter 507 on each chip 500 is preferably implemented using GaAs technology to enable the integration of digital and RF circuitry on the chip. This integration facilitates the ability to minimize the space requirements of the overall substrate assembly. Moreover, since the operating frequency of an active array antenna is determined by the spacing between radiator elements, the minimization of size permits the realization of improved high frequency electrical performance.
- the scan substrate 108 is attached to an aluminum-graphite frame 105 using film epoxy 113 and connected to the circular/linear polarization substrate 107 via Fuzz-button interconnections 111 .
- the regulator substrate 109 is located below the scan substrate 108 .
- This multilayer LTCC substrate 109 contains four sixteen-way combiners 602 that combine the output signals from the sixteen scan chips 500 .
- the regulator substrate 109 also contains regulator chips 604 for providing DC signals for the various chips in assembly 100 and for switches 606 for turning the chips on and off.
- the regulator substrate 109 has a multi-pin connector for delivering DC and digital signals, capacitors for DC and digital filtering, and four GPO connectors for bringing RF signals out of the substrate assembly 100 .
- This substrate 109 is attached to an aluminum-graphite frame 110 using film epoxy 113 .
- the multiple substrate frames 111 are fastened together using screws 114 , 115 or by any suitable alternative fastening system.
- the four output signals from each of the sixteen scan chips 500 on substrate 108 are connected via combiners 602 to the four bandpass filters 800 that are respectively tuned to f1, f2, f3, f4.
- the filters 800 are preferably installed outside of the substrate assembly 100 .
Abstract
Description
- [0001] This invention was made under Government Contract N00178-99-9-9001.
- This invention relates generally to active array RF systems and more particularly to a receiver capable of simultaneously receiving N independent RF input signals, which can respectively have different, scan angles and be circularly or linearly polarized.
- The prior art describes various active array RF systems useful in a wide range of military and commercial applications for handling circularly and/or linearly polarized signals. For example only, U.S. Pat. No. 6,020,848 describes a phased array antenna system that allows reception of electrically selectable single polarity or simultaneous dual polarity/dual beam signals.
- The present invention is directed to a wideband receiver system capable of simultaneously receiving multiple independent polarized (linearly or circularly) RF input signals from multiple sources within a wide scan angle range. Embodiments of the invention are suitable for a wide range of military and commercial application. The exemplary embodiment described herein is particularly suited for receiving input signals within the X/Ku band, e.g., between 10.9 and 15.35 Ghz.
- A preferred receiver in accordance with the invention utilizes first and second linear orthogonal radiators for respectively receiving composite signals RFX and RFY. Each of the composite signals can contain multiple independent RF input signals, e.g., F1 at a frequency of f1, F2 at a frequency of f2, . . . FN at frequency fN. The composite signals, RFX and RFY, are respectively divided into multiple components, e.g., (where N=4) RFX1, RFX2, RFX3, RFX4 and RFY1, RFY2, RFY3, RFY4. The RFX and RFY components are then uniquely paired and processed in a polarization compensation stage by selective phase shifting based on the known polarization (e.g., left hand circular, right hand circular, linear 0-90°/180°-270°, and linear 90°-180°/270°-360°) of the signals to be received to produce four coherent signals, i.e., RFXY1, RFXY2, RFXY3, RFXY4. These four coherent signals are then selectively phase shifted in a scan angle compensation stage to recover the input signals F1, F2, F3, F4. The recovered input signals are then preferably band pass filtered.
- More particularly, in a preferred embodiment, the composite signal RFX is applied to a four way divider which produces the four signals components RFX1, RFX2, RFX3, RFX4. Similarly, the composite signal RFY is applied to a four way divider to produce the signal components RFY1, RFY2, RFY3, RFY4. Each signal component contains contributions from the four input signals F1, F2, F3, F4. The RFX signal components are then respectively passed through controllable 90° phase shift branches and the RFY signal components are respectively passed through controllable 180° phase shift branches. The output of each 90° phase shift branch is uniquely paired with an output from a 180° phase shift branch and then summed in one of four two-way combiners to produce a coherent output. The 90° and 180° phase shift branches are digitally controlled to define a desired polarization angle, i.e., right hand circularly polarized, left hand circularly polarized, or linearly polarized, for each branch pairing. The following table describes an exemplary two bit control of the polarization phase shifters for each branch pairing for each polarity condition:
POLARITY 90° shifter 180° shifter Right Hand Circular ON OFF Left Hand Circular ON ON Linear 0°-90°/180°-270° OFF OFF Linear 90°-180°/270°-360° OFF ON - The coherent outputs of the four two-way combiners, each containing the input signals F1, F2, F3, F4, are then respectively applied to four digitally controlled phase shifters to compensate for scan angle. More particularly, the output of the first two-way combiner processing signals RFX1 and RFY1 is applied to a first phase shifter which is digitally controlled to define the scan angle of the input signal F1. Similarly, the outputs of the second, third and fourth two-way combiners are respectively applied to the second, third and fourth phase shifters which are respectively digitally controlled to define the scan angles of signals F2, F3, F4. The outputs from the scan angle phase shifters, which comprise the received input signals F1, F2, F3, F4, are then preferably passed through band filters respectively tuned to f1, f2, f3, f4. A preferred implementation of a receiver in accordance with the invention utilizes multiple substrates configured for stacking into a compact substrate assembly. The preferred substrate assembly includes six substrates or layers configured as follows:
- Layer 1=Radiator/Balun Substrate
-
Layer 2=Low Noise Amplifier (LNA) Substrate -
Layer 3=First Circular/Linear Polarization Control Substrate -
Layer 4=Second Circular/Linear Polarization Control Substrate -
Layer 5=Scan Control Substrate - Layer 6=Regulator Substrate
- The substrates are connected vertically preferably using fuzz-button interconnects, and caged via hole technology.
- The preferred substrate assembly comprises a sixteen channel device. That is the Radiator/Balun substrate forms a sixteen element matrix in which each element contains orthogonally polarized radiators for supplying composite signals RFX and RFY. Each element is coupled through the layers of the stack assembly forming the aforedisccussed receiver to recover four input signals F1, F2, F3, F4
- FIG. 1 is a block diagram depicting the architecture of a receiver in accordance with the present invention;
- FIG. 2 is a block diagram showing a preferred electronic implementation of the receiver architecture of FIG. 1;
- FIG. 3 is an exploded isometric illustration of a stack assembly implementing sixteen channels of an active array RF system where each channel can receive four independent RF input signals; and
- FIG. 4 is an exploded isometric illustration of an exemplary layer of the stack assembly of FIG. 3.
- Attention is initially directed to FIG. 1 which generally depicts a
receiver 100 in accordance with the invention for simultaneously receiving multiple independent RF input signals. The exemplary multiple input signals are represented in FIG. 1 as F1, F2, F3, F4 and are shown as emanating from respective independent signal sources (s/s). The characteristics of the signal sources can vary widely depending on the application of thereceiver 100. For example, the signal sources can be satellite based for use in a variety of commercial and direct-to-home systems for transferring broadcast television and/or internet and/or data signals. In other applications, the signal sources can comprise aircraft, ships, and land based stations for providing communication therebetween. - The input signals F1, F2, F3, F4, to be discussed herein will be presumed to be operating at frequencies f1, f2, f3, f4, respectively. Each independent input signal will also be presumed to be polarized, either linearly or circularly (right hand or left hand) and to be directed at a known scan angle relative to the
receiver 10. The intended function of thereceiver 10 is to be able to simultaneously receive multiple input signals despite their exhibiting different scan angles and polarizations. A receiver in accordance with the invention will herein be described with reference to a preferred embodiment intended to handle received input signals in the 10.9 to 15.35 GHz range wherein each input signal can be circularly or linear polarized and can exhibit a scan angle within a range −45° to +45° relative to the receiver. - The
receiver 10 is comprised of a first radiator 12 and asecond radiator 13 mounted orthogonal to one another. Theradiators 12 and 13 respectively yield composite output signals RFX and RFY in response to the signal energy incident on the radiators. Thus the composite signals RFX and RFY each contain contributions from input signals F1, F2, F3, F4. As shown in FIG. 1, the composite signal RFX is applied through abalun 14 to alow noise amplifier 15. Similarly the composite signal RFY is applied through abalun 16 to alow noise amplifier 17. The output oflow noise amplifier 15 is applied todivider circuit 18 which produces four substantially equal component signals RFX1, RFX2, RFX3, RFX4. Similarly, the output oflow noise amplifier 17 is coupled throughdivider circuit 19 to produce four substantially equal component signals RFY1, RFY2, RFY3, RFY4. The RFX and RFY component signals are all applied to the input of apolarity compensation stage 20. - The
polarity compensation stage 20 is comprised of multiple channels or branch pairs. Eachbranch pair 21 includes a 90°phase shift branch 22 and a 180°phase shift branch 23. More particularly, note in FIG. 1 that the RFX components supplied bydivider 18 are respectively applied to different 90°phase shift branches 22 within thepolarity compensation stage 20. Each 90°phase shift branch 22 is depicted as including a digitally controllable 90°phase shifter 24 and one or more amplifier stages. Similarly, the component outputs fromdivider 19 are respectively applied to different 180°phase shift branches 23, each branch including a digitally controllable 180°phase shifter 25 and one or more amplifier stages. - A
digital controller 27 is provided for selectively controlling the states (i.e., on/off) of each of thephase shifters polarity compensation stage 20. Thus, for example, four bits (output 28) respectively control the four 90°phase shifters 24. Similarly, four bits (output 29) respectively control the four 180°phase shifters 115. Polarity compensation is effected in each branch pair accordance with the following table:POLARITY 90° shifter 180° shifter Right Hand Circular ON OFF Left Hand Circular ON ON Linear 0°-90°/180°-270° OFF OFF Linear 90°-180°/270°-360° OFF ON - Operation in accordance with the foregoing table enables the
polarity compensation stage 20 to phase align paired RFX and RFY component signals to produce coherent output signals RFXY1, RFXY2, RFXY3, RFXY4 from the respective branch pairs. Each branch pair output signal constitutes the sum of respective branch signals. These coherent branch pair output signals are then applied to different channels of a scanangle compensation stage 30. - The scan
angle compensation stage 30 is depicted as being comprised of four channels, eachchannel 31 being comprised of a digitallycontrollable attenuator 32 connected in series with a digitallycontrollable phase shifter 33. - A twelve bit controller output (i.e., three bits per channel)35 controls the four
attenuators 32. The attenuators function to balance the amplitudes on the multiple channels ofcompensation stage 30. - A sixteen bit controller output36 (i.e., four bits per channel) controls the
phase shifters 33 to define a scan angle for each channel. Typically, each coherent signal, e.g., RFXY1, applied to the scanangle compensation stage 30 will contain a dominant input signal dependent upon the angle of incidence of the input signal energy on the radiators. - Thus, it should now be understood how the
polarity compensation stage 20 and the scanangle compensation stage 30 together process the composite signals supplied by theradiators 12 and 13 to recover the input signals F1, F2, F3, F4 at the outputs of thephase shifters 33. The outputs from thephase shifters 33 are preferably respectively directed through band pass filters 38 respectively tuned to the input signal frequencies, i.e., f1, f2, f3, f4. - Attention is now directed to FIG. 3 which illustrates a preferred structural implementation of the invention which comprises a sixteen channel substrate assembly100 (sometimes called “Receive Tile”) for use in an active phased array antenna system for receiving four simultaneous input signals within the X/Ku band which can exhibit various scan angles and be variously polarized. FIG. 2 is a block diagram illustrating the functional circuitry for a single channel of the
assembly 100. - The
substrate assembly 100 shown in FIG. 3 is comprised of six substrates or layers, that are stacked on top of one another. An exploded view of a single exemplary substrate is shown in FIG. 4. These substrates technology to form theassembly 100. The top substrate layer comprises amatrix 101 of sixteen radiator elements mounted adjacent to a balun substrate 102. Each radiator element includes two orthogonal polarized square patch radiators. Each pair of orthogonal radiators makes possible the reception of variously polarized signals as described in connection with FIG. 1. Theradiator matrix 101 is attached to the balun substrate 102 which preferably comprises a multilayer LTCC substrate. The balun substrate 102 is attached to an aluminum-graphite frame 103, e.g., by film epoxy 113 (FIG. 4). Theframe 103 supports the Fuzz-button interconnects 111 and enables vertical connection between the multiple substrates. The Fuzz-button interconnects 111 support the propagation of RF, DC and digital signals between the substrates. - Below the radiator/balun substrate layer is a low noise amplifier (LNA)
substrate 104. This multilayer LTCC substrate has a strip line and a two-way divider 201 (FIG. 2) for inputting and outputting RF signals, respectively, to and from the lownoise amplifier chip 300. Sixteen lownoise amplifier chips 300 are installed in thesubstrate 104. The LNA chips are connected to the strip line and output divider by caged viaholes 112 and strip lines. The DC signals are also delivered to the chip by the caged via holes. - Each pair of orthogonal radiators of
matrix 101 responds to incident signal energy by feeding the aforedisccussed composite signals RFX and RFY to a lownoise amplifier chip 300. The outputs of the low noise amplifier chip are connected to astrip line divider 201 that divides the signal into two substantially equal component signals. TheLNA chip 300 comprises a two-channel amplifier. Each channel is a five stage balancedlow noise amplifier 301 that operates in 9.75 to 15.35 GHz frequency range. Each channel consists of a two stagelow noise amplifier 302 with twoLang couplers 303 at input and output and a threestage buffer amplifier 304 with twoLang couplers 303 at input and output. The lownoise amplifier chip 300 provides amplification for the composite input signals RFX and RFY from the radiators to maintain the active array's low noise figure, high input return loss and wide bandwidth. TheLNA substrate 104 is attached to an aluminum-graphite frame 105 usingfilm epoxy 113. Thesubstrate 104 is then connected to the radiator/balun substrate 102 via Fuzz-button interconnection 111. - The
assembly 100 further includes a first circular/linear polarization substrate 106 interconnected below theLNA substrate 104. Thismulti-layer LTCC substrate 106 has a two-way divider 201 and a two-way combiner 202 for inputting and outputting RF signals, respectively, to and from a circular/linear polarization chip 400 insubstrate 106. Sixteenchips 400 are installed in the circular/linear polarization substrate 106. These chips are connected to theinput divider 201 andoutput combiners 202 via caged viaholes 112 and strip lines. DC and digital signals are also delivered to the chip by the caged via holes. - Each input divider on
substrate 106 divides an output signal from theLNA substrate 104 to produce substantially equal component signals which are fed to the circular/linear polarization chip 400. Each of thechips 400 includes digitally (one bit) controllable 90° phase shifters and digitally (one bit) controllable 180° phase shifters, as described in connection with FIG. 1. Each of thechips 400 also includes a serial to parallel converter (SPC) for converting a serial control stream to parallel control bits for controlling the phase shifters. The SPC devices are preferably implemented by gallium arsenide (GaAs) technology and integrated into the chip design. The integration of digital and RF circuits on thechips 400 enables the realization of high performance within a very compact physical package. Theoutput combiners 202 onsubstrate 106 combine the output signals from the circular/linear polarization (CP/LP)chip 400. Thesubstrate 106 is attached to an aluminum-graphite frame 105 usingfilm epoxy 113. - The CP/
LP chip 400 is a four-channel receiver chip that is capable of simultaneously receiving two linearly or circularly polarized signals. Each of channels one and two consists of a two-stage amplifier 403, a 90°phase shift 404, and a onestage amplifier 405. Each of channels three and four consists of a two-stage amplifier phase shift 407, and a onestage amplifier 408. The four bit digital serial toparallel converter 409 uses three TTL signals to control the phase shifters bits that control the polarization angles of the received signals. Channels one and three receive the linear and orthogonal components of the first signal applied tochip 400. Channels two and four receive the linear and orthogonal components of the second signal applied tochip 400. The amplifier stages provide amplification for incoming signals. The control bits controlling of the 180° and 90° phase shifts enable phase alignment of the differently polarized received signals, as described in the previously presented table. - Below the first circular/
linear polarization substrate 106 is a second circular/linear polarization substrate 107. Thesubstrate 107 is substantially identical tosubstrate 106 and includes a two-way divider 201 and a two-way combiner 202 for inputting and outputting RF signals, respectively, to and from its circular/linear polarization chip 400. Sixteenchips 400 are installed in the circular/linear polarization substrate 107. It should be understood from FIG. 2 and the earlier discussion of FIG. 1 thatsubstrate 106 produces coherent signals RFXY2 and RFXY3 andsubstrate 107 produces coherent signals RFXY1 and RFXY4. Below the circular/linear polarization substrate 107 is thescan substrate 108. This multilayer LTCC substrate has strip lines for inputting and outputting RF signals to and from the scan chips 500. Sixteenscan chips 500 are installed in thescan substrate 108. These chips are connected to the input and output strip lines via caged viaholes 112 and strip lines. The DC and digital signals are also delivered to thechip 500 by the caged via holes. The four coherent output signals produced by the circular/linear polarization substrates scan chip 500. Each of the scan chips 500 is comprised of four channels 501 where each channel includes a digitally (three bits)controllable attenuator 502 and a digitally (four bits) controllable phase shifter 504 as previously described in connection with FIG. 1. Each channel 501 consists of a threebit attenuator 502 and four bit phase shifter. Each threebit attenuator 502 has 0.5, 1 and 2 dB bits. Each four bit phase shifter 504 has 22.5°, 45°, 90° and 180° phase bits. Eachchip 500 also includes a serial to parallel converter 507 for converting a serial twenty-eight bit stream to parallel bits for controlling the attenuators and phase shifters. The attenuators facilitate proper signal balancing and tapering for a phased array antenna to reduce side lobes. Thescan chip 500 controls the scan angle of the receiver as described in connection with FIG. 1 and enables the receiver to receive signals with different scan angles. - The serial to parallel converter507 on each
chip 500 is preferably implemented using GaAs technology to enable the integration of digital and RF circuitry on the chip. This integration facilitates the ability to minimize the space requirements of the overall substrate assembly. Moreover, since the operating frequency of an active array antenna is determined by the spacing between radiator elements, the minimization of size permits the realization of improved high frequency electrical performance. - The
scan substrate 108 is attached to an aluminum-graphite frame 105 usingfilm epoxy 113 and connected to the circular/linear polarization substrate 107 via Fuzz-button interconnections 111. - The
regulator substrate 109 is located below thescan substrate 108. Thismultilayer LTCC substrate 109 contains four sixteen-way combiners 602 that combine the output signals from the sixteenscan chips 500. Theregulator substrate 109 also containsregulator chips 604 for providing DC signals for the various chips inassembly 100 and forswitches 606 for turning the chips on and off. Theregulator substrate 109 has a multi-pin connector for delivering DC and digital signals, capacitors for DC and digital filtering, and four GPO connectors for bringing RF signals out of thesubstrate assembly 100. Thissubstrate 109 is attached to an aluminum-graphite frame 110 usingfilm epoxy 113. The multiple substrate frames 111 are fastened together usingscrews - The four output signals from each of the sixteen
scan chips 500 onsubstrate 108 are connected via combiners 602 to the four bandpass filters 800 that are respectively tuned to f1, f2, f3, f4. The filters 800 are preferably installed outside of thesubstrate assembly 100. - From the foregoing, it should now be clear that an apparatus has been described enabling a receiver to simultaneously receive multiple independent RF input signals which can have different polarizations and different scan angles. Although a preferred embodiment has been described in detail, it should be appreciated that many variations and modifications will occur to those skilled in the art which fall within the spirit of the invention and intended scope of the appended claims.
Claims (20)
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/346,231 US6828932B1 (en) | 2003-01-17 | 2003-01-17 | System for receiving multiple independent RF signals having different polarizations and scan angles |
PCT/US2004/001127 WO2004068698A2 (en) | 2003-01-17 | 2004-01-16 | System for receiving multiple independent rf signals having different polarizations and scan angles |
JP2006502855A JP2006516379A (en) | 2003-01-17 | 2004-01-16 | System for receiving a plurality of independent RF signals having different polarizations and scan angles |
EP04702946A EP1583982A4 (en) | 2003-01-17 | 2004-01-16 | System for receiving multiple independent rf signals having different polarizations and scan angles |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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US10/346,231 US6828932B1 (en) | 2003-01-17 | 2003-01-17 | System for receiving multiple independent RF signals having different polarizations and scan angles |
Publications (2)
Publication Number | Publication Date |
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US20040233099A1 true US20040233099A1 (en) | 2004-11-25 |
US6828932B1 US6828932B1 (en) | 2004-12-07 |
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US10/346,231 Expired - Fee Related US6828932B1 (en) | 2003-01-17 | 2003-01-17 | System for receiving multiple independent RF signals having different polarizations and scan angles |
Country Status (4)
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US (1) | US6828932B1 (en) |
EP (1) | EP1583982A4 (en) |
JP (1) | JP2006516379A (en) |
WO (1) | WO2004068698A2 (en) |
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US9425890B2 (en) | 2009-04-13 | 2016-08-23 | Viasat, Inc. | Multi-beam active phased array architecture with independent polarization control |
US10516219B2 (en) | 2009-04-13 | 2019-12-24 | Viasat, Inc. | Multi-beam active phased array architecture with independent polarization control |
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US7145509B2 (en) * | 2004-02-17 | 2006-12-05 | Kyocera Corporation | Array antenna and radio communication apparatus using the same |
US20070264929A1 (en) * | 2004-12-18 | 2007-11-15 | Chao-Chun Chen | Satellite communication system architecture |
US20060135153A1 (en) * | 2004-12-18 | 2006-06-22 | Chao-Chun Chen | Satellite communication system architecture |
US7593753B1 (en) * | 2005-07-19 | 2009-09-22 | Sprint Communications Company L.P. | Base station antenna system employing circular polarization and angular notch filtering |
US7808427B1 (en) * | 2009-05-28 | 2010-10-05 | Raytheon Company | Radar system having dual band polarization versatile active electronically scanned lens array |
RU2501131C1 (en) * | 2012-05-03 | 2013-12-10 | Открытое акционерное общество Центральное конструкторское бюро аппаратостроения | Reflector-type active phased antenna array element (versions) |
US9667467B2 (en) | 2015-08-25 | 2017-05-30 | The Boeing Company | Gain distribution in compact high gain phased array antenna systems and methods |
KR102382640B1 (en) * | 2020-04-20 | 2022-04-01 | 원광대학교산학협력단 | Wireless communication apparatus having cross-polarization canceler |
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Also Published As
Publication number | Publication date |
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EP1583982A4 (en) | 2008-05-14 |
US6828932B1 (en) | 2004-12-07 |
JP2006516379A (en) | 2006-06-29 |
WO2004068698A3 (en) | 2005-01-27 |
WO2004068698A2 (en) | 2004-08-12 |
EP1583982A2 (en) | 2005-10-12 |
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