CN110011070A - A kind of Dual-polarized Micro Strip Array for synthetic aperture radar - Google Patents
A kind of Dual-polarized Micro Strip Array for synthetic aperture radar Download PDFInfo
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- CN110011070A CN110011070A CN201910293346.8A CN201910293346A CN110011070A CN 110011070 A CN110011070 A CN 110011070A CN 201910293346 A CN201910293346 A CN 201910293346A CN 110011070 A CN110011070 A CN 110011070A
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- high frequency
- frequency substrate
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- lower layer
- feeding network
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/27—Adaptation for use in or on movable bodies
- H01Q1/28—Adaptation for use in or on aircraft, missiles, satellites, or balloons
- H01Q1/285—Aircraft wire antennas
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/48—Earthing means; Earth screens; Counterpoises
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
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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
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- Engineering & Computer Science (AREA)
- Aviation & Aerospace Engineering (AREA)
- Remote Sensing (AREA)
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- Astronomy & Astrophysics (AREA)
- General Physics & Mathematics (AREA)
- Variable-Direction Aerials And Aerial Arrays (AREA)
Abstract
The invention discloses a kind of Dual-polarized Micro Strip Array for synthetic aperture radar, the antenna array includes: identical upper layer high frequency substrate and lower layer's high frequency substrate；It is supported by several dielectric posts, is placed in parallel to be spaced a distance between the two；Air dielectric layer is formed between the upper layer high frequency substrate and lower layer's high frequency substrate；Several radiation patch are set in the same position of the upper layer high frequency substrate and lower layer's high frequency substrate upper surface；The upper surface of lower layer's high frequency substrate is additionally provided with the dual polarization feeding network connecting with radiation patch, and the lower surface of lower layer's high frequency substrate is for metal.Dual-polarized Micro Strip Array of the invention has the advantages that high bandwidth, standing-wave ratio lower than 1.5, high-gain, particular beam, Sidelobe；Furthermore antenna array of the invention enormously simplifies antenna structure, easily designed and realization without design of sunkening cord.
Description
Technical field
The invention belongs to antenna technical fields, and in particular to a kind of double polarized micro strip antenna for synthetic aperture radar
Battle array.
Background technique
Synthetic aperture radar (SAR) is as a kind of microwave imaging remote sensing technology for working in active probe mode, from previous generation
It has recorded since occurring the fifties, is always the Hot spots for development in radar remote sensing field, be the important hand for realizing that earth observation is indispensable
Section.Synthetic aperture radar combines the performance for being conducive to experiment of UAV remote sensing system overall performance with unmanned plane.UAV system synthesis
The aperture radar time for lift off is short, it is easy to operate, the area of observation coverage can be reached rapidly and fly, be particularly suitable for low coverage and zonally
Area's (deep woods, river, massif etc.) imaging, greatly strengthens the detectivity of unmanned plane.
Effect of the antenna in SAR radar system is most important, and which determine the efficiency of input energy and emitted energies
Intensity has the function of being oriented to and amplifying electromagnetic wave.Usual airborne antenna has electromagnetic horn, Waveguide slot antenna, micro-strip
Antenna etc..Compared to electromagnetic horn and Waveguide slot antenna, microstrip antenna has low section, light-weight advantage, in addition, micro-strip
Paster antenna also has many advantages, such as suitable wide frequency range, various dual polarizations can be achieved, is low cost, easy to produce, in engineering field
It has been applied widely.However, microband paste is typical resonance class antenna, quality factor are very high, therefore smaller bandwidth.
Polarization information is able to reflect the vectorial property of electromagnetic wave, is electromagnetic wave in addition to time domain, frequency domain and spatial information (si)
Another utilizable important information extracts target signature according to the not like-polarized scatter echo of target, analyzes on this basis
Target property, to be distinguished to different type target.It is thus completely to portray the indispensable important parameter of target property,
And it is limited by the target signature that single-polarized antenna obtains, dual polarized antenna can obtain more target property information.
Double polarized micro strip antenna mostly uses stacking or the design of other special constructions at present, and multi-purpose probe structure feeds or needs
Aperture coupled is wanted to feed, structure is complicated, and difficulty of processing is big, higher cost.
Summary of the invention
The shortcomings that it is an object of the invention to overcome the above-mentioned prior art and deficiency, are based on Antenna Impedance Matching technology, mention
For a kind of Dual-polarized Micro Strip Array for synthetic aperture radar, have high bandwidth, standing-wave ratio lower than 1.5, high-gain, specific
The advantages of wave beam, Sidelobe.
To achieve the goals above, the invention proposes a kind of Dual-polarized Micro Strip Array for synthetic aperture radar,
The antenna array includes: identical upper layer high frequency substrate and lower layer's high frequency substrate；It is supported between the two by several dielectric posts,
It is placed in parallel to be spaced a distance；Air dielectric layer is formed between the upper layer high frequency substrate and lower layer's high frequency substrate；
Several radiation patch are set in the same position of the upper layer high frequency substrate and lower layer's high frequency substrate upper surface；The lower layer is high
The upper surface of frequency substrate is additionally provided with the dual polarization feeding network connecting with radiation patch, and the lower surface of lower layer's high frequency substrate is
Metal.
As a kind of improvement of above-mentioned apparatus, the dual polarization feeding network includes: horizontal polarization feeding network and vertical
Polarize feeding network, and the horizontal polarization feeding network includes one one point six not equal part power splitter and six one point of trisection function
Divide device, the vertical polarization feeding network includes one one point six not equal part power splitter and six one point of trisection power splitters；Two
A one point six not equal part power splitter be symmetrical arranged.
As a kind of improvement of above-mentioned apparatus, the horizontal polarization feeding network, vertical polarization feeding network and lower layer are high
The radiation patch of frequency substrate is located at approximately the same plane；Each radiation patch is separately connected one point of a horizontal polarization feeding network
One point of trisection power splitter of trisection power splitter and a vertical polarization feeding network.
As a kind of improvement of above-mentioned apparatus, the power of the not equal part power splitter of one point six of the horizontal polarization feeding network
Distribution meets Chebyshev's distribution, and the power distribution of equal part power splitter does not meet and cuts one point six of the vertical polarization feeding network
Than snow husband's distribution.
As a kind of improvement of above-mentioned apparatus, the radiation patch of lower layer's high frequency substrate horizontally spaced set,
Spaced set in the longitudinal direction.
As a kind of improvement of above-mentioned apparatus, the material of the radiation patch is metal conductive materials.
A kind of improvement as above-mentioned apparatus, which is characterized in that the radiation patch is square, side length L are as follows:
Wherein,
Wherein, Δ L is equivalent radiated power gap length, and W is the width of general microstrip antenna radiation patch；εeFor equivalent dielectric
Constant；H is the thickness of lower layer's high frequency substrate, f0For the centre frequency of Antenna Operation, εrIt is normal for the opposite dielectric of lower layer's high frequency substrate
Number, c is the light velocity.
As a kind of improvement of above-mentioned apparatus, the surrounding identical bits of the upper layer high frequency substrate and lower layer's high frequency substrate are installed
Multiple first via holes are set, screw sequentially passes through the first via hole, dielectric posts and lower layer's high frequency base of upper layer high frequency substrate from top to bottom
First via hole of plate, and be secured with nuts below lower layer's high frequency substrate.
As a kind of improvement of above-mentioned apparatus, the material of the dielectric posts is resin.
As a kind of improvement of above-mentioned apparatus, the same position at four angles of the upper layer high frequency substrate and lower layer's high frequency substrate
On be respectively equipped with 4 the second via holes of circle, for antenna array and external equipment to be attached.
Compared with prior art, method advantage of the invention is:
1, Dual-polarized Micro Strip Array of the invention, have high bandwidth, standing-wave ratio lower than 1.5, high-gain, particular beam,
The advantages of Sidelobe；
2, the present invention provides a kind of Dual-polarized Micro Strip Arrays for synthetic aperture radar, by using parasitic patch
The mode of (radiation patch of upper layer high frequency substrate), solves resistance matching problem, so that two feeding networks point
Cloth solves the problems, such as that Dual-polarized Micro Strip Array needs to be layered feed in same layer；
3, Dual-polarized Micro Strip Array of the invention is without sunkening cord design, enormously simplifies antenna structure, it is easily designed with
It realizes；
4, Dual-polarized Micro Strip Array of the invention uses dielectric posts between two layers of high frequency substrate, that is, ensure that substrate
Between positional relationship, also be conducive to reinforce antenna structural strength.Antenna is avoided to receive windage deformation in high-altitude.
Detailed description of the invention
Fig. 1 is the overall structure diagram of the Dual-polarized Micro Strip Array for synthetic aperture radar of the invention；
Fig. 2 is lower layer's high frequency substrate and on-board circuitry schematic diagram of the invention；
Fig. 3 is upper layer high frequency substrate and on-board circuitry schematic diagram of the invention；
Fig. 4 is dielectric posts and positional diagram of the invention；
Fig. 5 is the lobe pattern of vertical polarization port excitation；
Fig. 6 is the lobe pattern of horizontal polarization port excitation.
Specific embodiment
Below with reference to embodiment and in conjunction with attached drawing, the present invention is described in further detail.
As shown in Figure 1, a kind of Dual-polarized Micro Strip Array for synthetic aperture radar, comprising: two pieces of identical high frequencies
Substrate, air dielectric layer, two pieces of high frequency substrates are supported by dielectric posts, so that a certain distance is placed in parallel.Two pieces of height
Frequency substrate is divided into upper layer high frequency substrate and lower layer's high frequency substrate, and upper layer high frequency substrate top surface is equipped with radiation patch, lower layer's high frequency base
Plate top surface is equipped with the radiation patch of dual polarization feeding network and quantity identical as top plate, and lower layer's high frequency substrate bottom surface is metal
Ground.
As shown in Fig. 2, the dual polarization feeding network on lower layer's high frequency substrate top surface includes one point of six not equal part power splitter
With one point of trisection power splitter, radiation patch is connected by transmission network.The radiation patch is square, the size and work of patch
The size of working frequency and high frequency substrate is related with characteristic, and paster material is metal conductive materials, and the radiation patch of top plate is located at
Right above lower plywood radiation patch, as shown in Figure 3.The spacing of radiation patch is determining using the conventional method of Antenna Design, this reality
It applies example and chooses 0.75 λ0, both will not will not be because of the excessive generation grid of spacing because of the too small coupling caused between radiation patch of spacing
Valve, wherein λ0For free space wavelength.Radiation patch horizontally spaced set, in the longitudinal direction spaced set.
Upper layer high frequency substrate and lower layer's high frequency substrate are supported by the dielectric posts of via hole, and screw sequentially passes through from top to bottom
Layer high frequency substrate, dielectric posts and lower layer's high frequency substrate, and be secured with nuts below lower layer's high frequency substrate, two pieces of high frequency substrates
Between formed air dielectric layer.Feeding network is divided into horizontal polarization feeding network and vertical polarization feeding network, and horizontal polarization
The radiation patch of feeding network, vertical polarization feed and lower layer's high frequency substrate is located at approximately the same plane, horizontal polarization feeding network
Comprising one one point six, equal part power splitter and six one point of trisection power splitters, vertical polarization feeding network do not include one one point
Six not equal part power splitter and six one point of trisection power splitters.Described one point six not the power distribution of equal part power splitter meet and cut ratio
Husband's distribution is avenged, the present embodiment takes minor level -21dB to calculate, and power-division ratios from top to bottom are followed successively by 0.25:0.59:1:1:
0.59:0.25.The type and quantity of above-mentioned power splitter require flexible choice according to different Antenna Designs.
Dielectric posts are resin material, avoid causing to couple using metal material, and dielectric posts are provided with 11, as shown in Figure 4；
Height is 3.7mm, and upper layer high frequency substrate and lower layer's high frequency substrate have 11 via holes for fixing upper layer high frequency substrate, lower layer respectively
High frequency substrate and dielectric posts.
The material of upper layer high frequency substrate and lower layer's high frequency substrate is Rogers RT/duroid 5880 (tm), and size is
280*192*0.5mm has 4 circular vias on four angles, for antenna and external equipment to be connected respectively.
Dual polarization feeding network and radiation patch are printed on the high frequency substrate, and thickness selects general thickness 35um.
The polarization mode of Dual-polarized Micro Strip Array is vertical polarization and horizontal polarization.
The design process of the Dual-polarized Micro Strip Array includes:
Step S1) plate choose, the design select with a thickness of 0.5mm 5880 plate of rogers, dielectric constant compared with
It is low, it is easy to accomplish broadband.
Step S2) determine the number of radiation patch.Antenna element gain is generally 7-10dB, the every increase of radiation patch number
1 times, antenna gain about increases 3dB；Gain requirement is 20db in the present embodiment, and the gain of radiation patch is 9dB, radiation patch
Number 18, estimation antenna gain is 21.5dB.
Step S3) according to the actual operating frequency of antenna, estimate the length of radiation patch on lower layer and upper layer high frequency substrate.
The length L of radiation patch is determined by following formula:
Wherein,
Wherein, Δ L is equivalent radiated power gap length, and W is the width of general microstrip antenna radiation patch；εeFor equivalent dielectric
Constant；H is the thickness of high frequency substrate, f0For the centre frequency of Antenna Operation, εrFor the relative dielectric constant of high frequency substrate, c is light
Speed.
Step S4) it is required according to actual antennas wave beam, design dual polarization feeding network.The function of dual polarization feeding network point ratio
Determine that the design selects minor level -21dB to calculate using the optimal array of Chebyshev.
Step S5) using every physical length of HFSS design software optimization antenna, until index is optimal value.
The dual polarized antenna index of the present embodiment are as follows:
1. polarization mode: horizontal polarization, vertical polarization.
2. centre frequency 5.7GHZ.
3. band is wider than 400MHZ.
4. gain is greater than 20dB.
5. vertical plane minor level is less than -12dB.
6. horizontal plane minor level is less than -20dB.
7. cross polarization level is less than -25dB in half-power beam width.
The part index number of optimization, parameter are as follows:
1. lower layer patch patch side length 17.5cm, last time patch side length 18.4cm.
2. dual polarization feeding network phase difference is less than 10 °.
It is illustrated in figure 5 the lobe pattern of vertical polarization port in the present embodiment, wherein solid line indicates the radiation side of vertical plane
Xiang Tu, dotted line indicate the antenna pattern of horizontal plane, You Tuzhong it is found that transmitting antenna using the above structure vertical plane spoke
The half power lobe width for penetrating directional diagram is 22 °, and minor level is less than 13dB；In the half-power wave of the antenna pattern of horizontal plane
Degree is 13 °, and minor level is less than -21dB.
It is illustrated in figure 6 the lobe pattern of horizontal polarization port in the present embodiment, wherein solid line indicates the radiation side of vertical plane
Xiang Tu, dotted line indicate the antenna pattern of horizontal plane, You Tuzhong it is found that transmitting antenna using the above structure vertical plane spoke
The half power lobe width for penetrating directional diagram is 22 °, and minor level is less than -13dB；In the half-power of the antenna pattern of horizontal plane
Lobe width is 13 °, and minor level is less than -21dB.
It should be noted last that the above examples are only used to illustrate the technical scheme of the present invention and are not limiting.Although ginseng
It is described the invention in detail according to embodiment, those skilled in the art should understand that, to technical side of the invention
Case is modified or replaced equivalently, and without departure from the spirit and scope of technical solution of the present invention, should all be covered in the present invention
Scope of the claims in.
Claims (10)
1. a kind of Dual-polarized Micro Strip Array for synthetic aperture radar, which is characterized in that the antenna array includes: identical
Upper layer high frequency substrate and lower layer's high frequency substrate；It is supported between the two by several dielectric posts, to be spaced a distance flat
Row is placed；Air dielectric layer is formed between the upper layer high frequency substrate and lower layer's high frequency substrate；The upper layer high frequency substrate is under
Several radiation patch are set in the same position of layer high frequency substrate upper surface；The upper surface of lower layer's high frequency substrate is additionally provided with
The dual polarization feeding network connecting with radiation patch, the lower surface of lower layer's high frequency substrate is for metal.
2. the Dual-polarized Micro Strip Array according to claim 1 for synthetic aperture radar, which is characterized in that described double
The feeding network that polarizes includes: horizontal polarization feeding network and vertical polarization feeding network, and the horizontal polarization feeding network includes
One one point six equal part power splitter and six one point of trisection power splitters, the vertical polarization feeding network do not include one one point
Six not equal part power splitter and six one point of trisection power splitters；Two one point six not equal part power splitter be symmetrical arranged.
3. the Dual-polarized Micro Strip Array according to claim 2 for synthetic aperture radar, which is characterized in that the water
The radiation patch of mean pole feeding network, vertical polarization feeding network and lower layer's high frequency substrate is located at approximately the same plane；Each spoke
Penetrate one point of trisection power splitter and vertical polarization feeding network that patch is separately connected a horizontal polarization feeding network
One point of trisection power splitter.
4. a kind of Dual-polarized Micro Strip Array for synthetic aperture radar according to claim 2, which is characterized in that institute
The power distribution for stating one point six of horizontal polarization feeding network not equal part power splitter meets Chebyshev's distribution, the vertical polarization
The power distribution of the not equal part power splitter of one point six of feeding network meets Chebyshev's distribution.
5. the Dual-polarized Micro Strip Array according to claim 3 for synthetic aperture radar, which is characterized in that under described
The radiation patch horizontally spaced set of layer high frequency substrate, in the longitudinal direction spaced set.
6. the Dual-polarized Micro Strip Array according to claim 1 for synthetic aperture radar, which is characterized in that the spoke
The material for penetrating patch is metal conductive materials.
7. according to claim 1, being used for the Dual-polarized Micro Strip Array of synthetic aperture radar, feature described in one of 3,5 or 6
It is, the radiation patch is square, side length L are as follows:
Wherein,
Wherein, Δ L is equivalent radiated power gap length, and W is the width of general microstrip antenna radiation patch；εeFor effective dielectric constant；
H is the thickness of lower layer's high frequency substrate, f0For the centre frequency of Antenna Operation, εrFor the relative dielectric constant of lower layer's high frequency substrate, c
For the light velocity.
8. the Dual-polarized Micro Strip Array according to claim 1 for synthetic aperture radar, which is characterized in that on described
Multiple first via holes are arranged in the surrounding same position of layer high frequency substrate and lower layer's high frequency substrate, and screw sequentially passes through from top to bottom
First via hole of layer the first via hole of high frequency substrate, dielectric posts and lower layer's high frequency substrate, and used in the lower section of lower layer's high frequency substrate
Nut is fixed.
9. the Dual-polarized Micro Strip Array for synthetic aperture radar according to claim 1 or 8, which is characterized in that institute
The material for the dielectric posts stated is resin.
10. the Dual-polarized Micro Strip Array for synthetic aperture radar according to claim 1 or 8, which is characterized in that institute
It states and is respectively equipped with 4 the second via holes of circle in the same position at four angles of upper layer high frequency substrate and lower layer's high frequency substrate, being used for will
Antenna array is attached with external equipment.
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Cited By (6)
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| CN110797649A (en) * | 2019-11-11 | 2020-02-14 | 中国电子科技集团公司第十四研究所 | Broadband dual-polarization microstrip antenna sub-array with filtering and scaling functions |
| CN111509379A (en) * | 2020-04-09 | 2020-08-07 | 山东华箭科工创新科技有限公司 | Double-layer 5G microstrip array antenna |
| CN111864366A (en) * | 2020-07-24 | 2020-10-30 | 上海炫雅科技有限公司 | Antenna structure for improving cross polarization performance of dual-polarization microstrip antenna |
| CN113036437A (en) * | 2021-03-17 | 2021-06-25 | 中国科学院微电子研究所 | Millimeter wave radar antenna |
| CN114188715A (en) * | 2021-12-31 | 2022-03-15 | 深圳市道通智能汽车有限公司 | Microstrip antenna and millimeter wave radar |
| CN116937185A (en) * | 2023-07-28 | 2023-10-24 | 南京华成微波技术有限公司 | Intelligent double-polarized linear array microwave receiving and transmitting system |
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| CN114188715A (en) * | 2021-12-31 | 2022-03-15 | 深圳市道通智能汽车有限公司 | Microstrip antenna and millimeter wave radar |
| CN116937185A (en) * | 2023-07-28 | 2023-10-24 | 南京华成微波技术有限公司 | Intelligent double-polarized linear array microwave receiving and transmitting system |
| CN116937185B (en) * | 2023-07-28 | 2024-02-23 | 南京华成微波技术有限公司 | Intelligent double-polarized linear array microwave receiving and transmitting system |
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Application publication date: 20190712 |