CN102820503A - Half-lumped miniaturized microwave filter and design method thereof - Google Patents
Half-lumped miniaturized microwave filter and design method thereof Download PDFInfo
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- CN102820503A CN102820503A CN2012102972742A CN201210297274A CN102820503A CN 102820503 A CN102820503 A CN 102820503A CN 2012102972742 A CN2012102972742 A CN 2012102972742A CN 201210297274 A CN201210297274 A CN 201210297274A CN 102820503 A CN102820503 A CN 102820503A
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Abstract
The invention discloses a half-lumped miniaturized microwave filter. According to the prototype circuit of a low-pass filter, the conventional distributed capacitors are replaced by a lumped capacitor in the middle of a micro-strip transmission line, so that the size of the microwave filter is effectively reduced, and the low pass filtering characteristic of a wide stop-band is generated at the same time. By using the half-lumped miniaturized microwave filter, the problem of the structure miniaturization of the microwave filter in a modern communication system is solved effectively; and the half-lumped miniaturized microwave filter is small in structural size, low in pass-band insertion loss, and wide in stop-band frequency range, low in cost and high in precision, and can be machined by adopting a standard printed circuit board technology conveniently.
Description
Technical field
The invention belongs to the design field of microwave and millimetric wave device, be specifically related to a kind of miniaturization microwave filter of half lump.
Background technology
Along with the fast development of wireless communication system, to the extraction of signal and utilization require increasingly high.Microwave filter is as one of indispensable Primary Component in the modern communications equipment; It is various unwanted signals of filtering and noise signal effectively; The signal that reduces between each circuit disturbs; Thereby ensure normal, the effectively work of communication equipment, realize high-quality communication, and then reach effective utilization of frequency resource.
Microwave filter is extensive application in systems such as microwave and millimeter wave communication, radar navigation, electronic countermeasures, missile guidance, test instrumentation, and its performance quality tends to directly have influence on the performance of whole system.General common microwave filter form mainly contains following several kinds: waveguide filter, microstrip filter, strip line filter and coaxial cavity filter or the like.According to different applications, need to adopt different structural forms to realize.And along with the development of system in package technology, to the miniaturization of microwave device and high performance demand more and more widely.Therefore,, how to design the microwave filter that satisfies the demands and more and more cause people's attention, the research of high performance miniaturization microwave filter also is of great significance and value as one of main components and parts in the communication system.
Traditional microwave low-pass filter mainly is to realize through the resonant tank between lumped capacity and the lumped inductance; But the applying frequency scope of this mode is very limited, because lumped capacity and inductance self are produced in the microwave frequency band scope parasitic capacitance and stray inductance can exert an influence to the performance of circuit.Adopt distributed parameter to realize lumped capacity and inductance in the circuit structure, can solve the not high enough problem of frequency application well.In " Equivalent-circuit analysis and lowpass filter design of split ring resonator DGS " article that people such as Wu B. deliver on Journal of electromagnetic waves and application periodical, propose to adopt the structure on split-ring resonator structure binding deficient ground to realize low pass filter.In " Sharp-rejection lowpass filter with controllable transmission zero " article that people such as Zhang J. deliver on Progress in electromagnetic research periodical, propose to adopt complementary split-rings resonator to design low pass filter.But these Filter Structures are comparatively complicated, be not easy to regulate, and its performance also need to improve.
Summary of the invention
In order to overcome existing defective in the above-mentioned prior art; The present invention provides a kind of miniaturization microwave filter of half lump; According to the prototype circuit structure of low pass filter, in the middle of microstrip transmission line, directly use lumped capacity to replace traditional distributed capacitor, obtain having the low-frequency filter characteristics of wide stopband; Little based on microwave filter physical dimension of the present invention, logical little, the stop-band frequency wide ranges of in-band insertion loss, and be convenient to adopt standard printed circuit board technology to process.
For realizing above-mentioned purpose, the concrete scheme that the present invention adopts is following:
According to an aspect of the present invention; A kind of miniaturization microwave filter of half lump is provided; Comprise the microwave-medium substrate, be arranged on first port 201, second port 202 on the said microwave-medium substrate, also comprise be arranged on the said microwave-medium substrate like lower component:
-be connected first microstrip transmission line 901 between said first port 201 and second port 202;
-be connected to second microstrip transmission line 902 between said first port 201 and second port 202, the 3rd microstrip transmission line 903, second lumped capacity 302, the 4th microstrip transmission line 904, the 5th microstrip transmission line 905 in turn; Wherein, Form series resonance between said second microstrip transmission line 902, second lumped capacity 302, the 4th microstrip transmission line 904 and produced a transmission zero, form two transmission zeros of the extra generation of resonance between said the 3rd microstrip transmission line 903, second lumped capacity 302, the 4th microstrip transmission line 904;
-the first lumped capacity 301, it is connected in the end that said second microstrip transmission line 902 connects said the 3rd microstrip transmission line 903, and said second microstrip transmission line 902 is through said first lumped capacity, 301 ground connection;
-Di three lumped capacities 303, it is connected in the end that said the 5th microstrip transmission line 905 connects said the 4th microstrip transmission line 904, and said the 5th microstrip transmission line 905 is through said the 3rd lumped capacity 303 ground connection.
Preferably, said microwave-medium substrate is the lossy dielectric material, relative dielectric constant=2.65, dielectric thickness=0.5 millimeter, surface metal thickness=35 micron, loss angle tangent=0.002.
Preferably, first lumped capacity is a flaky electric capacity, and model is 0603, and the capacitance size is 5.2 pico farads; Second lumped capacity is a flaky electric capacity, and model is 0402, and the capacitance size is 0.5 pico farad; The 3rd lumped capacity is a flaky electric capacity, and model is 0603, and the capacitance size is 5.2 pico farads.
Preferably, the input and output feeder line of said first port 201 and second port 202 all adopts 50 ohm microstrip forms, and matees with the SMA coaxial fitting.
According to another aspect of the present invention, a kind of method for designing of the miniaturization microwave filter according to said half lump provided by the invention is provided also, comprises the steps:
Steps A: lumped capacity being set on the microwave-medium substrate and between first port 201 and second port 202, microstrip transmission line being set, to produce three transmission zeros;
Step B: the capacitance of confirming the length and the lumped capacity of microstrip transmission line according to design parameter.
Preferably, said steps A comprises the steps:
-between said first port 201 and second port 202, first microstrip transmission line 901 is set;
-second microstrip transmission line 902 that is connected successively, the 3rd microstrip transmission line 903, second lumped capacity 302, the 4th microstrip transmission line 904, the 5th microstrip transmission line 905 be set between said first port 201 and second port 202;
First lumped capacity 301 that-setting is connected with the end that said second microstrip transmission line 902 is connected said the 3rd microstrip transmission line 903;
The 3rd lumped capacity 303 that-setting is connected with the end that said the 5th microstrip transmission line 905 is connected said the 4th microstrip transmission line 904.
Preferably, said step B comprises the steps:
-confirm the length of said first microstrip transmission line 901 according to the low-pass cut-off frequencies parameter;
-confirm the length of second microstrip transmission line 902 and the 5th microstrip transmission line 905 according to the location parameter of second transmission zero and the 3rd transmission zero;
-confirm the length of the 3rd microstrip transmission line 903 and the 4th microstrip transmission line 904 according to the location parameter of the 3rd transmission zero;
-confirm the capacitance of said second lumped capacity 302 according to the stop-band frequency range parameter,
Wherein, said the 3rd transmission zero be in said three transmission zeros the position near the transmission zero of passband, said second transmission zero be in said three transmission zeros position time near the transmission zero of passband.
Beneficial effect of the present invention: the structure miniaturization and the high performance problem that efficiently solve microwave filter in the millimeter-wave systems; Through between microstrip transmission line, using lumped capacity to replace distributed capacitor; Dwindle the area of filter greatly, satisfied the requirement of Modern Communication System miniaturization; Insertion loss in the passband is little, and in stopband range, has introduced three transmission zeros, has increased the blanketing frequency scope to spurious resonance; This filter construction is simple, is convenient to adopt standard printed circuit board technology to process realization, and cost is low, and precision is high.
Description of drawings
Fig. 1 is the vertical view according to the structure of the miniaturization microwave filter of half lump provided by the invention;
Fig. 2 be according to the miniaturization microwave filter of half lump provided by the invention transmission characteristic along with the second lumped capacity C
2The curve chart that changes;
Fig. 3 be according to the miniaturization microwave filter of half lump provided by the invention the curve chart that changes along with the length l of the 3rd microstrip transmission line and/or the 4th microstrip transmission line of transmission characteristic;
Fig. 4 be according to the miniaturization microwave filter of half lump provided by the invention the curve chart that changes along with the length a of second microstrip transmission line and/or the 5th microstrip transmission line of transmission characteristic;
Fig. 5 be according to the miniaturization microwave filter of half lump provided by the invention test result and simulation result comparison diagram.
Embodiment
Be easy to understand understanding in order to make technological means of the present invention, creation characteristic and to reach purpose, further set forth the present invention below in conjunction with specific embodiment.
The present invention provides a kind of miniaturization microwave filter of half lump, comprises microwave-medium substrate, microstrip transmission line and lumped capacity.Said microstrip transmission line is etched in microwave-medium plate surface; Through in the middle of microstrip transmission line, adopting lumped capacity to replace distributed capacitor; Obviously reduce the physical dimension of circuit, in stopband, introduced three transmission zeros simultaneously, increased the frequency range of stopband.
As shown in Figure 1; Be vertical view according to the miniaturization microwave filter of half lump provided by the invention; First microstrip transmission line 901 is connected between first port 201 and second port 202, can access different low-pass cut-off frequencies through the length that designs said first microstrip transmission line 901.Wherein, said first port 201 can be input port or output port, and correspondingly, said second port 202 is output port or input port, and this does not influence flesh and blood of the present invention, will not give unnecessary details inferior.
Between said first port 201 and second port 202, also be connected with second microstrip transmission line 902, the 3rd microstrip transmission line 903, second lumped capacity 302, the 4th microstrip transmission line 904, the 5th microstrip transmission line 905 in turn.Second microstrip transmission line 902 is connected with ground with the 3rd lumped capacity 303 through first lumped capacity 301 respectively with the 5th microstrip transmission line 905.
Wherein, form series resonance between said second microstrip transmission line 902, second lumped capacity 302, the 4th microstrip transmission line 904 and produced a transmission zero, be used for improving the steepness of transmission characteristic; Form two transmission zeros of the extra generation of resonance between said the 3rd microstrip transmission line 903, second lumped capacity 302, the 4th microstrip transmission line 904, be used for increasing the width of stop-band frequency scope.
In a preference of present embodiment, said microwave-medium substrate is the lossy dielectric material, relative dielectric constant=2.65, dielectric thickness=0.5 millimeter, surface metal thickness=35 micron, loss angle tangent=0.002.The input and output feeder line of said first port 201 and second port 202 all adopts 50 ohm microstrip forms, and matees with the SMA coaxial fitting.
As shown in Figure 2, shown that transmission characteristic according to the miniaturization microwave filter of half lump provided by the invention is along with the second lumped capacity C
2The curve chart that changes can be known by figure, along with C
2The capacitance size becomes big, and the stop-band frequency scope narrows down.
As shown in Figure 3; Shown according to the transmission characteristic of the miniaturization microwave filter of half lump provided by the invention and can know by figure, along with l becomes big along with the curve chart that the length l of the 3rd microstrip transmission line and/or the 4th microstrip transmission line changes; The more past passband in the position of the 3rd transmission zero near; Reduced the stop-band frequency scope, wherein, said the 3rd transmission zero be in said three transmission zeros the position near the transmission zero of passband.
As shown in Figure 4; Shown the curve chart that changes along with the length a of second microstrip transmission line and/or the 5th microstrip transmission line according to the transmission characteristic of the miniaturization microwave filter of half lump provided by the invention; Can know by figure; Along with a becomes big, what the position between second transmission zero and the 3rd transmission zero was divided opens more, wherein; Said the 3rd transmission zero be in said three transmission zeros the position near the transmission zero of passband, said second transmission zero be in said three transmission zeros position time near the transmission zero of passband.
As shown in Figure 5, shown according to the test result and the simulation result comparison diagram of the miniaturization microwave filter of half lump provided by the invention, can know that by comparison diagram simulation result and test result are identical basically, reached the expectation effect.
The present invention also provides a kind of method for designing of the miniaturization microwave filter according to said half lump provided by the invention, comprises the steps:
Steps A: lumped capacity being set on the microwave-medium substrate and between first port 201 and second port 202, microstrip transmission line being set, to produce three transmission zeros;
Step B: the capacitance of confirming the length and the lumped capacity of microstrip transmission line according to design parameter.
Particularly, said steps A comprises the steps:
-between said first port 201 and second port 202, first microstrip transmission line 901 is set;
-second microstrip transmission line 902 that is connected successively, the 3rd microstrip transmission line 903, second lumped capacity 302, the 4th microstrip transmission line 904, the 5th microstrip transmission line 905 be set between said first port 201 and second port 202;
First lumped capacity 301 that-setting is connected with the end that said second microstrip transmission line 902 is connected said the 3rd microstrip transmission line 903;
The 3rd lumped capacity 303 that-setting is connected with the end that said the 5th microstrip transmission line 905 is connected said the 4th microstrip transmission line 904.
More particularly, said step B comprises the steps:
-confirm the length of said first microstrip transmission line 901 according to the low-pass cut-off frequencies parameter;
-confirm the length of second microstrip transmission line 902 and the 5th microstrip transmission line 905 according to the location parameter of second transmission zero and the 3rd transmission zero;
-confirm the length of the 3rd microstrip transmission line 903 and the 4th microstrip transmission line 904 according to the location parameter of the 3rd transmission zero;
-confirm the capacitance of said second lumped capacity 302 according to the stop-band frequency range parameter,
Wherein, said the 3rd transmission zero be in said three transmission zeros the position near the transmission zero of passband, said second transmission zero be in said three transmission zeros position time near the transmission zero of passband.
To sum up; Miniaturization microwave filter according to half lump provided by the invention leads to in-band insertion loss less than 0.9dB; Three transmission zeros have been produced in the stopband; When with-when 20dB was the inhibition standard in the stopband, the stop-band frequency scope was from 0.83GHz to 2.37GHz, the Filter Structures size is 0.04 λ * 0.03 λ.It is thus clear that; The present invention can effectively solve the structure miniaturization and the high performance problem of microwave filter in the millimeter-wave systems; Through between microstrip transmission line, using lumped capacity to replace distributed capacitor, the size of having dwindled filter has greatly satisfied the requirement of Modern Communication System miniaturization; This filter construction is simple simultaneously, is convenient to adopt standard printed circuit board technology to process realization, and cost is low, and precision is high.
More than show and described basic principle of the present invention, principal character and advantage of the present invention.Those skilled in the art should understand; The present invention is not restricted to the described embodiments; That describes in the foregoing description and the specification just explains principle of the present invention; The present invention also has various changes and modifications under the prerequisite that does not break away from spirit and scope of the invention, and these variations and improvement all fall in the scope of the invention that requires protection.The present invention requires protection range to be defined by appending claims and equivalent thereof.
Claims (7)
1. the miniaturization microwave filter of one and half lumps; Comprise the microwave-medium substrate, be arranged on first port (201), second port (202) on the said microwave-medium substrate; It is characterized in that, also comprise be arranged on the said microwave-medium substrate like lower component:
-be connected first microstrip transmission line (901) between said first port (201) and second port (202);
-be connected to second microstrip transmission line (902), the 3rd microstrip transmission line (903), second lumped capacity (302), the 4th microstrip transmission line (904), the 5th microstrip transmission line (905) between said first port (201) and second port (202) in turn; Wherein, Form series resonance between said second microstrip transmission line (902), second lumped capacity (302), the 4th microstrip transmission line (904) and produced a transmission zero, form two transmission zeros of the extra generation of resonance between said the 3rd microstrip transmission line (903), second lumped capacity (302), the 4th microstrip transmission line (904);
-the first lumped capacity (301), it is connected in the end that said second microstrip transmission line (902) connects said the 3rd microstrip transmission line (903), and said second microstrip transmission line (902) is through said first lumped capacity (301) ground connection;
-Di three lumped capacities (303), it is connected in the end that said the 5th microstrip transmission line (905) connects said the 4th microstrip transmission line (904), and said the 5th microstrip transmission line (905) is through said the 3rd lumped capacity (303) ground connection.
2. the miniaturization microwave filter of half lump according to claim 1 is characterized in that, said microwave-medium substrate is the lossy dielectric material; Relative dielectric constant=2.65; Dielectric thickness=0.5 millimeter, surface metal thickness=35 micron, loss angle tangent=0.002.
3. the miniaturization microwave filter of half lump according to claim 1 is characterized in that, first lumped capacity (301) is a flaky electric capacity, and model is 0603, and the capacitance size is 5.2 pico farads; Second lumped capacity (302) is a flaky electric capacity, and model is 0402, and the capacitance size is 0.5 pico farad; The 3rd lumped capacity (303) is a flaky electric capacity, and model is 0603, and the capacitance size is 5.2 pico farads.
4. the miniaturization microwave filter of half lump according to claim 1 is characterized in that, the input and output feeder line of said first port (201) and second port (202) all adopts 50 ohm microstrip forms, and matees with the SMA coaxial fitting.
5. the method for designing of the miniaturization microwave filter of described half lump of claim 1 is characterized in that, comprises the steps:
Steps A: lumped capacity being set on the microwave-medium substrate and between first port (201) and second port (202), microstrip transmission line being set, to produce three transmission zeros;
Step B: the capacitance of confirming the length and the lumped capacity of microstrip transmission line according to design parameter.
6. the method for designing of the miniaturization microwave filter of half lump according to claim 5 is characterized in that said steps A comprises the steps:
-between said first port (201) and second port (202), first microstrip transmission line (901) is set;
-second microstrip transmission line (902), the 3rd microstrip transmission line (903), second lumped capacity (302), the 4th microstrip transmission line (904), the 5th microstrip transmission line (905) that is connected successively be set between said first port (201) and second port (202);
-first lumped capacity (301) that the end that is connected said the 3rd microstrip transmission line (903) with said second microstrip transmission line (902) is connected is set;
-the 3rd lumped capacity (303) that the end that is connected said the 4th microstrip transmission line (904) with said the 5th microstrip transmission line (905) is connected is set.
7. the method for designing of the miniaturization microwave filter of half lump according to claim 5 is characterized in that said step B comprises the steps:
-confirm the length of said first microstrip transmission line (901) according to the low-pass cut-off frequencies parameter;
-confirm the length of second microstrip transmission line (902) and the 5th microstrip transmission line (905) according to the location parameter of second transmission zero and the 3rd transmission zero;
-confirm the length of the 3rd microstrip transmission line (903) and the 4th microstrip transmission line (904) according to the location parameter of the 3rd transmission zero;
-confirm the capacitance of said second lumped capacity (302) according to the stop-band frequency range parameter,
Wherein, said the 3rd transmission zero be in said three transmission zeros the position near the transmission zero of passband, said second transmission zero be in said three transmission zeros position time near the transmission zero of passband.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104078726A (en) * | 2014-06-04 | 2014-10-01 | 中国电子科技集团公司第十研究所 | Parallel connection type unilateral elliptic function transmission line filter |
| CN105406831A (en) * | 2015-12-21 | 2016-03-16 | 成都新欣神风电子科技有限公司 | Semi-lumped microwave band-pass filtering circuit and filter |
| US9882254B2 (en) | 2014-07-10 | 2018-01-30 | Sercomm Corporation | Microstrip line filter |
| CN112886936A (en) * | 2021-04-29 | 2021-06-01 | 中国电子科技集团公司第九研究所 | Novel miniature ultra wide band high pass filter |
| CN116259940A (en) * | 2023-04-14 | 2023-06-13 | 天津理工大学 | Dual-passband filter composed of semi-lumped elements |
| CN116259940B (en) * | 2023-04-14 | 2024-05-03 | 天津理工大学 | Dual-passband filter composed of semi-lumped elements |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104078726A (en) * | 2014-06-04 | 2014-10-01 | 中国电子科技集团公司第十研究所 | Parallel connection type unilateral elliptic function transmission line filter |
| CN104078726B (en) * | 2014-06-04 | 2016-07-06 | 中国电子科技集团公司第十研究所 | Parallel connection type one side elliptic function line filter |
| US9882254B2 (en) | 2014-07-10 | 2018-01-30 | Sercomm Corporation | Microstrip line filter |
| CN105406831A (en) * | 2015-12-21 | 2016-03-16 | 成都新欣神风电子科技有限公司 | Semi-lumped microwave band-pass filtering circuit and filter |
| CN112886936A (en) * | 2021-04-29 | 2021-06-01 | 中国电子科技集团公司第九研究所 | Novel miniature ultra wide band high pass filter |
| CN112886936B (en) * | 2021-04-29 | 2022-03-01 | 中国电子科技集团公司第九研究所 | Novel miniature ultra wide band high pass filter |
| CN116259940A (en) * | 2023-04-14 | 2023-06-13 | 天津理工大学 | Dual-passband filter composed of semi-lumped elements |
| CN116259940B (en) * | 2023-04-14 | 2024-05-03 | 天津理工大学 | Dual-passband filter composed of semi-lumped elements |
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