CN103117449A - Axial mode helical antenna with double-layer segmental medium lens - Google Patents
Axial mode helical antenna with double-layer segmental medium lens Download PDFInfo
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- CN103117449A CN103117449A CN2013100677296A CN201310067729A CN103117449A CN 103117449 A CN103117449 A CN 103117449A CN 2013100677296 A CN2013100677296 A CN 2013100677296A CN 201310067729 A CN201310067729 A CN 201310067729A CN 103117449 A CN103117449 A CN 103117449A
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Abstract
The invention relates to an axial mode helical antenna, particularly to an axial mode helical antenna with a double-layer segmental medium lens. The axial mode helical antenna with the double-layer segmental medium lens aims at solving the problem that when the coil number of an existing helical antenna is large, the enhancement effect of the gain is obvious, and the manufacture of the antenna can be complex. The double-layer segmental medium lens is arranged above the upper end of the helical antenna, and the lower surface of the double-layer segmental medium lens is a downward-convex spherical surface. The distance between the vertex of the lower surface of the double-layer segmental medium lens and the upper end surface of the helical antenna is 12mm, the lower end of the helical antenna is connected with the terminals of micro-strip line metal straps on a micro-strip impedance transformer floor, the tops of the micro-strip line metal straps on the micro-strip impedance transformer floor are connected with an inner conductor of a coaxial feeder line, the central axis of the helical antenna is perpendicular to the upper surface of the micro-strip impedance transformer floor, and the micro-strip metal straps are arranged on the micro-strip impedance transformer floor in a question mark shape. The axial mode helical antenna with the double-layer segmental medium lens is applicable to the radio field.
Description
Technical field
The present invention relates to the axial mode helical antenna, be specifically related to the axial mode helical antenna that loads with double-deck segment di-lens.
Background technology
helical antenna is by a kind of antenna of spiral metal wire as radiant body, the shape that is wound around due to helix is different, can be divided into cylindrical screw, the cylindroid spiral, trochoid spiral and spherical helix etc., wherein axial mode is a kind of important mode of operation of helical antenna, this kind pattern mainly produce along helical axis to radiation, and the electromagnetic wave of radiation is circularly polarised wave, so be widely used in satellite communication, recent development along with mobile communication, cover in order to obtain stable on a large scale WLAN, the axial mode helical antenna also is used as antenna for base station.The input impedance of the helical antenna of axial mode work is approximate in the broad frequency band frequency range of 2: 1 (theoretical value near) is a constant, is about 140 Ω, so have the broadband impedance characteristic.Usually the gain of helical antenna is determined by the spiral number of turns, in the situation that pitch is certain, more the gain of vast of heaven line is just higher for helix, but when the number of turns was excessive, the effect that gain improves was just not obvious, and the making of antenna also will become very complicated.In order to obtain high-gain, can take three kinds of modes: one, group battle array: shortcoming is to introduce complicated feeding network, and the application of array is restricted; Two, the axial mode elliptical cylinder-shape spiral that adopt to become lift angle is as antenna radiator: compare under same axial length, number of turns condition with common helical antenna, gain maximum in the certain frequency scope can increase about 1dB, but the making of antenna is very complicated; Three, adopt large reflecting surface: adopt the antenna of this method to have higher gain and simple structure, but the size of this antenna is very large.In addition, existing feed port impedance is generally 50 Ω, if directly give the helical antenna feed of 140 Ω, can produce 22.5% energy reflection loss, therefore must consider resistance matching problem.
Summary of the invention
The present invention is for solving the existing helical antenna number of turns when excessive, the DeGrain that gain improves, and the making of antenna also will become very complicated problem, and then the axial mode helical antenna that loads with double-deck segment di-lens is proposed.
the present invention addresses the above problem the technical scheme of taking to be: the present invention includes double-deck segment di-lens, helix, micro belt impedance converter floor and coaxial feeder, double-deck segment di-lens is arranged on the top of helix upper end, the lower surface of double-deck segment di-lens is lower protruding sphere, the distance of the vertex distance helix upper end end face of double-deck segment di-lens lower surface is 12mm, on the lower end of helix and micro belt impedance converter floor, the terminal of microstrip line metal strap is connected, on the micro belt impedance converter floor, the top of microstrip line metal strap is connected with the inner wire of coaxial feeder, the axis of helix is vertical with the upper surface on micro belt impedance converter floor, microstrip line metal strap on micro belt impedance converter floor 3 is the question mark shaped setting.
The invention has the beneficial effects as follows: after the present invention had introduced a double-deck segment di-lens, in the situation that do not affect other performance, gain was increased to 11dB by 10dB, has obtained significant raising; After the present invention adopted custom-designed micro belt impedance converter floor, the working band of antenna was 1.82GHz～2.46GHz, and relative bandwidth has reached 30% higher value; Micro belt impedance converter of the present invention is circuitron, and is simple in structure, is convenient to produce in enormous quantities low cost of manufacture.
Description of drawings
Fig. 1 is overall structure schematic diagram of the present invention, Fig. 2 is the cutaway view of double-deck segment di-lens, Fig. 3 is micro belt impedance converter floor upper surface schematic diagram, and Fig. 4 is the experimental result of antenna standing-wave ratio, and Fig. 5 is that antenna is in the experimental result of the circular polarization gain pattern of 2.4GHz.
Embodiment
embodiment one: present embodiment is described in conjunction with Fig. 1 to Fig. 5, the described axial mode helical antenna that loads with double-deck segment di-lens of present embodiment comprises double-deck segment di-lens 1, helix 2, micro belt impedance converter floor 3 and coaxial feeder 4, double-deck segment di-lens 1 is arranged on the top of helix 2 upper ends, the lower surface of double-deck segment di-lens 1 is lower protruding sphere, the distance h 1 of the vertex distance helix 2 upper end end faces of double-deck segment di-lens 1 lower surface is 12mm, on the lower end of helix 2 and micro belt impedance converter floor 3, the terminal of microstrip line metal strap is connected, on micro belt impedance converter floor 3, the top of microstrip line metal strap is connected with the inner wire of coaxial feeder 4, the axis of helix 2 is vertical with the upper surface on micro belt impedance converter floor 3, microstrip line metal strap on micro belt impedance converter floor 3 is the question mark shaped setting.
In present embodiment the microstrip line metal strap is by ten curve end to end compositions, sets up rectangular coordinate system take the geometric center of micro belt impedance converter floor 3 upper surfaces as initial point, and the coordinate parameters that forms ten curves of microstrip line metal strap is:
Embodiment two: present embodiment is described in conjunction with Fig. 2, the double-deck segment di-lens 1 of the described axial mode helical antenna that loads with double-deck segment di-lens of present embodiment is comprised of outer media ball 1-1 and internal layer medium ball 1-2, outer media ball 1-1 is sleeved on internal layer medium ball 1-2, and the centre of sphere of outer media ball 1-1 overlaps with the centre of sphere of internal layer medium ball 1-2.
The technique effect of present embodiment is: the two layer medium globe lens has been realized the environment of gradual change for Electromagnetic Wave Propagation, can reduce electromagnetic wave in the reflection of lens surface, and assembles preferably the electromagnetic wave effect in addition.
Other composition and annexation are identical with embodiment one.
Embodiment three: present embodiment is described in conjunction with Fig. 2, the thickness h of the double-deck segment di-lens 1 of the described axial mode helical antenna that loads with double-deck segment di-lens of present embodiment is 17.5mm～18.5mm, the diameter d 1 of outer media ball 1-1 is 217mm～219mm, the medium relative dielectric constant ε of outer media ball 1-1
r1=2.25, the diameter d 2 of internal layer medium ball 1-2 is 190mm～192mm, the medium relative dielectric constant ε of internal layer medium ball 1-2
r2=4.5.
The technique effect of present embodiment is: by the relative dielectric constant of choose reasonable lens sizes and material, can reduce to greatest extent to load the antenna impedance mismatch that causes, and can effectively improve the gain of antenna.
Other composition and annexation are identical with embodiment one.
Embodiment four: present embodiment is described in conjunction with Fig. 2, the thickness h of the double-deck segment di-lens 1 of the described axial mode helical antenna that loads with double-deck segment di-lens of present embodiment is 18mm, the diameter d 1 of outer media ball 1-1 is 218mm, and the diameter d 2 of internal layer medium ball 1-2 is 191.6mm.Other composition and annexation are identical with embodiment three.
Embodiment five: present embodiment is described in conjunction with Fig. 1, the diameter D of the helix 2 of the described axial mode helical antenna that loads with double-deck segment di-lens of present embodiment is 30mm～34mm, the pitch S of helix 2 is 22mm～26mm, and the number of turns of helix 2 is five circles.
The technique effect of present embodiment is: by the design of helix size, can make impedance, polarization and the gain parameter of antenna realize optimizing in needed frequency band.
Other composition and annexation are identical with embodiment one.
Embodiment six: in conjunction with Fig. 1, present embodiment is described, the diameter D of the helix 2 of the described axial mode helical antenna that loads with double-deck segment di-lens of present embodiment is 32mm, and the pitch S of helix 2 is 24mm.Other composition and annexation are identical with embodiment five.
Embodiment seven: present embodiment is described in conjunction with Fig. 1, the micro belt impedance converter floor 3 of the described axial mode helical antenna that loads with double-deck segment di-lens of present embodiment is the micro belt impedance converter floor 3 that the polytetrafluoroethylfiberglass fiberglass-cloth laminated sheet is made, the diameter on micro belt impedance converter floor 3 is 95mm～105mm, the thickness on micro belt impedance converter floor 3 is 2mm, the relative dielectric constant on micro belt impedance converter floor 3 is 2.3, and on micro belt impedance converter floor 3, the thickness of microstrip line metal strap is 0.018mm～0.037mm.
The technique effect of present embodiment is: the micro belt impedance converter of introducing is printed circuit, and the floor of helical antenna can be served as in the large floor of microstrip circuit, and the cost of manufacture of printed circuit is lower simultaneously, can reduce like this holistic cost of antenna.
Other composition and annexation are identical with embodiment one.
Embodiment eight: in conjunction with Fig. 1, present embodiment is described, the diameter on the micro belt impedance converter floor 3 of the described axial mode helical antenna that loads with double-deck segment di-lens of present embodiment is 100mm, and the thickness on micro belt impedance converter floor 3 is 2mm.Other composition and annexation are identical with embodiment seven.
Embodiment nine: in conjunction with Fig. 1, present embodiment is described, the coaxial feeder 4 of the described axial mode helical antenna that loads with double-deck segment di-lens of present embodiment is that diameter is the coaxial feeder that the coaxial cable of 50 Ω of 2mm～5mm is made.
The technique effect of present embodiment is: the coaxial cable that diameter is less can couple together circuit board easily, can effectively reduce simultaneously the weight of circuit, the power capacity of the coaxial cable transmission that diameter is larger is larger, adopts the design of present embodiment can make the scope of application of antenna more extensive.
Other composition and annexation are identical with embodiment one.
Embodiment ten: in conjunction with Fig. 1, present embodiment is described, the coaxial feeder 4 of the described axial mode helical antenna that loads with double-deck segment di-lens of present embodiment is that diameter is the coaxial feeder that the coaxial cable of 50 Ω of 5mm is made.Other composition and annexation are identical with embodiment nine.
Claims (10)
1. the axial mode helical antenna that loads with double-deck segment di-lens, it is characterized in that: the described axial mode helical antenna that loads with double-deck segment di-lens comprises double-deck segment di-lens (1), helix (2), micro belt impedance converter floor (3) and coaxial feeder (4), double-deck segment di-lens (1) is arranged on the top of helix (2) upper end, the lower surface of double-deck segment di-lens (1) is lower protruding sphere, the distance (h1) of vertex distance helix (2) the upper end end face of double-deck segment di-lens (1) lower surface is 12mm, the lower end of helix (2) is connected with the terminal of the upper microstrip line metal strap in micro belt impedance converter floor (3), the top of the upper microstrip line metal strap in micro belt impedance converter floor (3) is connected with the inner wire of coaxial feeder (4), the axis of helix (2) is vertical with the upper surface on micro belt impedance converter floor (3), microstrip line metal strap on micro belt impedance converter floor (3) is the question mark shaped setting.
2. the axial mode helical antenna that loads with double-deck segment di-lens according to claim 1, it is characterized in that: double-deck segment di-lens (1) is comprised of outer media ball (1-1) and internal layer medium ball (1-2), outer media ball (1-1) is sleeved on internal layer medium ball (1-2), and the centre of sphere of outer media ball (1-1) overlaps with the centre of sphere of internal layer medium ball (1-2).
3. the axial mode helical antenna that loads with double-deck segment di-lens according to claim 1, it is characterized in that: the thickness (h) of double-deck segment di-lens (1) is 17.5mm～18.5mm, the diameter (d1) of outer media ball (1-1) is 217mm～219mm, the medium relative dielectric constant ε of outer media ball (1-1)
r1=2.25, the diameter (d2) of internal layer medium ball (1-2) is 190mm～192mm, the medium relative dielectric constant ε of internal layer medium ball (1-2)
r2=4.5.
4. the axial mode helical antenna that loads with double-deck segment di-lens according to claim 3, it is characterized in that: the thickness (h) of double-deck segment di-lens (1) is 18mm, the diameter (d1) of outer media ball (1-1) is 218mm, and the diameter (d2) of internal layer medium ball (1-2) is 191.6mm.
5. the axial mode helical antenna that loads with double-deck segment di-lens according to claim 1, it is characterized in that: the diameter (D) of helix (2) is 30mm～34mm, the pitch (S) of helix (2) is 22mm～26mm, and the number of turns of helix (2) is five circles.
6. the axial mode helical antenna that loads with double-deck segment di-lens according to claim 5, it is characterized in that: the diameter (D) of helix (2) is 32mm, and the pitch (S) of helix (2) is 24mm.
7. the axial mode helical antenna that loads with double-deck segment di-lens according to claim 1, it is characterized in that: micro belt impedance converter floor (3) is the micro belt impedance converter floor (3) that the polytetrafluoroethylfiberglass fiberglass-cloth laminated sheet is made, the diameter on micro belt impedance converter floor (3) is 95mm～105mm, the thickness on micro belt impedance converter floor (3) is 2mm, the relative dielectric constant on micro belt impedance converter floor (3) is 2.3, the thickness of the upper microstrip line metal strap in micro belt impedance converter floor (3) is 0.018mm～0.037mm.
8. the axial mode helical antenna that loads with double-deck segment di-lens according to claim 7, it is characterized in that: the diameter on micro belt impedance converter floor (3) is 100mm, the thickness on micro belt impedance converter floor (3) is 2mm.
9. the axial mode helical antenna that loads with double-deck segment di-lens according to claim 1 is characterized in that: coaxial feeder (4) is that diameter is the coaxial feeder that the coaxial cable of 50 Ω of 2mm～5mm is made.
10. the axial mode helical antenna that loads with double-deck segment di-lens according to claim 9 is characterized in that: coaxial feeder (4) is that diameter is the coaxial feeder that the coaxial cable of 50 Ω of 5mm is made.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013100677296A CN103117449A (en) | 2013-03-04 | 2013-03-04 | Axial mode helical antenna with double-layer segmental medium lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013100677296A CN103117449A (en) | 2013-03-04 | 2013-03-04 | Axial mode helical antenna with double-layer segmental medium lens |
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| Publication Number | Publication Date |
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| CN103117449A true CN103117449A (en) | 2013-05-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013100677296A Pending CN103117449A (en) | 2013-03-04 | 2013-03-04 | Axial mode helical antenna with double-layer segmental medium lens |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103474746A (en) * | 2013-08-28 | 2013-12-25 | 西安空间无线电技术研究所 | Axial mould spiral antenna with excellent axial ratio property |
| CN108232447A (en) * | 2018-02-28 | 2018-06-29 | 中国人民解放军国防科技大学 | Impedance transformer for self-compensating structure antenna |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4287518A (en) * | 1980-04-30 | 1981-09-01 | Nasa | Cavity-backed, micro-strip dipole antenna array |
| CN1153315C (en) * | 1999-09-30 | 2004-06-09 | 株式会社东芝 | Antenna device |
| CN102255145A (en) * | 2011-04-19 | 2011-11-23 | 浙江大学 | Lens type antenna housing |
| CN102694265A (en) * | 2011-03-25 | 2012-09-26 | 吕清 | Micro-strip scoop-type feed slit surface wave excitation antenna |
-
2013
- 2013-03-04 CN CN2013100677296A patent/CN103117449A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4287518A (en) * | 1980-04-30 | 1981-09-01 | Nasa | Cavity-backed, micro-strip dipole antenna array |
| CN1153315C (en) * | 1999-09-30 | 2004-06-09 | 株式会社东芝 | Antenna device |
| CN102694265A (en) * | 2011-03-25 | 2012-09-26 | 吕清 | Micro-strip scoop-type feed slit surface wave excitation antenna |
| CN102255145A (en) * | 2011-04-19 | 2011-11-23 | 浙江大学 | Lens type antenna housing |
Non-Patent Citations (1)
| Title |
|---|
| 白贵芳等: "《天线与电波传播解题指南》", 31 January 2012 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103474746A (en) * | 2013-08-28 | 2013-12-25 | 西安空间无线电技术研究所 | Axial mould spiral antenna with excellent axial ratio property |
| CN103474746B (en) * | 2013-08-28 | 2015-09-23 | 西安空间无线电技术研究所 | A kind of axial mode helical antenna with excellent axial ratio performance |
| CN108232447A (en) * | 2018-02-28 | 2018-06-29 | 中国人民解放军国防科技大学 | Impedance transformer for self-compensating structure antenna |
| CN108232447B (en) * | 2018-02-28 | 2023-09-15 | 中国人民解放军国防科技大学 | Impedance converter for self-compensating structure antenna |
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Application publication date: 20130522 |