CN104701613A - Low-RCS (radar cross section) microstrip patch antenna based on polarization conversion - Google Patents
Low-RCS (radar cross section) microstrip patch antenna based on polarization conversion Download PDFInfo
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- CN104701613A CN104701613A CN201510112415.2A CN201510112415A CN104701613A CN 104701613 A CN104701613 A CN 104701613A CN 201510112415 A CN201510112415 A CN 201510112415A CN 104701613 A CN104701613 A CN 104701613A
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Abstract
The invention discloses a low-RCS microstrip patch antenna based on polarization conversion. The low-RCS microstrip patch antenna based on polarization conversion is used for solving the defect of poor scattering performance of existing microstrip patch antennas. The low-RCS microstrip patch antenna based on polarization conversion comprises a radiating unit (1), a dielectric slab (2), a metal ground slab (3), a coaxial joint (4) and a polarization conversion surface (5). The upper surface and the lower surface of the dielectric slab (2) are printed with the radiating unit (1), and the polarization conversion surface (5) as well as the metal ground slab (3) respectively; the polarization conversion surface (5) is composed of four polarization conversion unit groups (51), and the center of the polarization conversion surface (5) is provided with a square area (6); every polarization conversion unit group (51) comprises a plurality of polarization conversion units (511) with the symmetric axises provided with square notches (512) which point to the same direction. The low-RCS microstrip patch antenna based on polarization conversion has the advantages of being stable in radiating performance and high in scattering performance and can serve as a communication antenna on a low-RCS device.
Description
Technical field
The invention belongs to antenna technical field, relate to a kind of micro-strip paster antenna of low radar cross section, in particular to a kind of micro-strip paster antenna being reduced radar cross section by application polarization conversion structure, under the prerequisite ensureing antenna radiation performance, there is good scattering properties.Be applicable to radar system radiation characteristic and scattering properties all being had to requirement.
Background technology
In various communication system, antenna is the important component part in radar system, and its radar cross section is the main contributions source of the overall radar cross section of aircraft.Because antenna is as communication equipment, first need the normal reception and the transmitting that ensure self electromagnetism ripple, the therefore conventional technology of reducing radar cross section is also not suitable for antenna radar area reduction.Effectively reducing the radar cross section of antenna, and ensure that the radiation characteristic of antenna itself is not subject to obvious impact, is that a difficult problem maximum in field is reduced in antenna radar cross section.The scattering of antenna generally includes two parts: a part is the scattered field of antenna when connecing matched load, and be the structure item scattered field irrelevant with antenna load situation, its scattering mechanism can be explained by the scattering mechanism of common scattering object; Another part is then the radar cross section under meaning loading condition taken over by antenna, because load is not mated with antenna, electromagnetic wave is through the reflection of antenna, carry out secondary radiation and the scattered field produced, because it is relevant with the change of antenna load situation, therefore be called antenna mode scattering field, as a loaded scatters body, this is the distinctive scattering of antenna.In the face of polarization is identical, and being in the electromagnetic wave in antenna operating band, realizing low radar cross section characteristic, is an extremely difficult task.At present, Chinese scholars does not all find completely desirable technological means, and antenna can be made to realize good radiation and scattering properties simultaneously.So, how to ensure that, under the impregnable prerequisite of antenna radiation characteristics, design has the antenna of low radar cross section, significant.
In antenna system, reduce radar cross section realize mainly through following three kinds of modes:
(1) time domain radar cross section controls.When communication system needs work, antenna is allowed to be in normal operating conditions, and when communication system does not work, antenna is then managed to stash, thus realize the low radar cross section characteristic of time sharing system, but, just lose low radar cross section characteristic completely when communication system works.
(2) radar cross section, spatial domain controls.If antenna belongs to oblique fire formula traveling-wave antenna, then antenna tilt can be placed, thus make the maximum of structural mode scattering shift out threat radar region, meanwhile, by width phase control, its greatest irradiation direction still can be made to remain on required direction, in addition, good impedance matching is carried out to aerial array, reduces antenna mode scattering, finally realize low radar cross section characteristic.But, except threat radar region, low radar cross section characteristic cannot be kept.
(3) frequency domain radar cross section controls.By smear radar absorbing, appropriate change antenna profile, adopt passive cancellation techniques or active cancellation techniques, all can effectively realize good scattering properties, wherein first two is the most effective and the most frequently used.
Existing micro-strip paster antenna is printed conductor thin slice and metal floor and formed respectively in the upper and lower both sides of dielectric substrate.Compared with other antennas, there is lightweight, thin profile and be easy to the features such as processing.Fig. 1 gives a kind of existing micro-strip paster antenna, comprises radiating element 1, dielectric-slab 2, metal floor 2 and coaxial fitting 4; The upper and lower surface of dielectric-slab 1 is printed with radiating element 2 and metal floor 3 respectively, coaxial fitting inner core is connected with radiating element through dielectric-slab, the outer core of coaxial fitting is then connected with metal floor 3, radiating element 2 adopts the length of side to be the square-shaped metal paster of 15.6mm, and floor adopts the length of side to be the square-shaped metal paster of 80mm.By rational optimal design, this antenna can realize good radiation characteristic, but because the size of the metal floor of this micro-strip paster antenna is greater than radiating element, there is radar cross section high, the defect of scattering properties difference.
Summary of the invention
The object of the invention is to the defect existed for above-mentioned existing micro-strip paster antenna, proposing a kind of low radar cross section micro-strip paster antenna based on polarization conversion, for reducing the radar cross section of micro-strip paster antenna, improving its scattering property.
For realizing above-mentioned object, the present invention includes radiating element 1, dielectric-slab 2, metal floor 3 and coaxial fitting 4; The upper and lower surface of described dielectric-slab 2 is printed with respectively radiating element 1 and metal floor 3, it is characterized in that: be also printed with polarization conversion surface 5 at the upper surface of dielectric-slab 2, this polarization conversion surface 5 is made up of four polarization conversion unit groups 51, these polarization conversion unit groups are distributed in the surrounding of radiating element 1, the middle formation length of side is the span of the square area 6, M of M is 19-23mm; Each polarization conversion unit group 51 comprises several polarization conversion unit 511, polarization conversion unit 511 is the circumference be made up of a line segment bent through several times is foursquare symmetrical structure, symmetry axis leaves square notch 512, and the square notch 512 of polarization conversion unit 511 in each polarization conversion unit group 51 is pointed to identical.
The above-mentioned low radar cross section micro-strip paster antenna based on polarization conversion, it is characterized in that polarization conversion unit group 51 is that arrangement is formed in the cycle such as X-direction and Y-direction by n polarization conversion unit 511, n >=8, at the default polarization conversion unit 511 in summit place near radiating element 1, for the formation of the square area 6 in the middle of polarization conversion surface 5; The sensing of polarization conversion unit 511 square notch 512 in adjacent polarized converting unit group 51 differs 90 °.
The above-mentioned low radar cross section micro-strip paster antenna based on polarization conversion, it is characterized in that polarization conversion unit 511 has four resonance frequencys, its lowest resonant frequency is identical with the operating frequency of existing micro-strip paster antenna.
The above-mentioned low radar cross section micro-strip paster antenna based on polarization conversion, it is characterized in that the circumference square size dimension S1 of polarization conversion unit 511 is 9mm, square notch 512 size dimension S2 is 3mm, and the span of the feature sizes S3 of bending line segment is 0.9-1.1mm.
The above-mentioned low radar cross section micro-strip paster antenna based on polarization conversion, it is characterized in that the shape of radiating element 1 is for square, the length of side is 15.6mm.
The above-mentioned low radar cross section micro-strip paster antenna based on polarization conversion, is characterized in that the outer core 42 of coaxial fitting 4 is connected with metal floor 3, and inner core 41 is connected with radiating element 1 through dielectric-slab 2, forms base drive structure.
Compared with prior art, tool has the following advantages in the present invention:
1) the present invention is owing to have employed the polarization conversion surface be made up of four polarization conversion unit groups, and the electromagnetic wave that adjacent polarized converting unit group reflects because polarised direction offsets mutually on the contrary, thus effectively reduces radar cross section.
2) the present invention is identical with operating frequency of antenna due to the resonance frequency of polarization conversion unit, in antenna operating band, finally reduce the radar cross section of antenna.And because this polarization conversion unit has four frequency characteristics, still can effectively reduce radar cross section outward at antenna operating band, finally in broadband, achieve good scattering properties.
3) the present invention is due to the size by adjusting the square area formed by four polarization conversion unit groups, eliminates the impact produced antenna radiation characteristics owing to introducing polarization conversion surface, ensure that antenna radiation performance is basicly stable.
Accompanying drawing explanation
Fig. 1 is the overall structure figure of existing micro-strip paster antenna;
Fig. 2 is sectional structure chart of the present invention;
Fig. 3 is plan structure figure of the present invention;
Fig. 4 is the structural representation of the polarization conversion unit in the present invention;
Fig. 5 is the S parameter characteristic schematic diagram of the polarization conversion unit in the present invention;
Fig. 6 is the S parameter curve comparison figure of the present invention and existing micro-strip paster antenna;
Fig. 7 is the present invention and existing micro-strip paster antenna at the antenna pattern in x-z face and y-z face;
Fig. 8 is the radar cross section comparison diagram that the present invention and existing micro-strip paster antenna change with angle respectively under x polarizes and y polarized electromagnetic wave irradiates;
Fig. 9 be the present invention and existing micro-strip paster antenna respectively under x polarizes and y polarized electromagnetic wave irradiates with the radar cross section comparison diagram of frequency change.
Embodiment
Below in conjunction with the drawings and specific embodiments, the invention will be further described
Embodiment 1:
With reference to Fig. 2, the present invention includes radiating element 1, dielectric-slab 2, metal floor 3, coaxial fitting 4 and polarization conversion surface 5.It is 80mm square dielectric material that dielectric-slab 2 adopts dielectric constant to be 4.4, length of side L, and its thickness h is 2mm; Be printed with radiating element 1 at the upper surface geometric center place of dielectric-slab 2, this radiating element 1 adopts profile to be foursquare metal patch, and its length of side w is 15.6mm, is printed with polarization conversion surface 5 in the surrounding of the upper surface radiating element 1 of dielectric-slab 2.Be printed with metal floor 3 at dielectric-slab 2 lower surface, the shape of this metal floor 3 is identical with dielectric-slab 2 with size.The immediate vicinity of dielectric-slab 2 is provided with via hole, and the inner core 41 of coaxial fitting 4 welds with radiating element 1 through this via hole, and outer core 42 is connected with metal floor 3, forms base drive structure.
With reference to Fig. 3 and Fig. 4, the circumference on polarization conversion surface 5, in square, is made up of four the polarization conversion unit groups 51 being distributed in radiating element 1 surrounding.By 15 polarization conversion unit 511, in the cycle such as X-direction and Y-direction, arrangement is formed each polarization conversion unit group 51 respectively, and a length of side M=23mm, square area 6 around radiating element 1 is being formed near a drift angle place default polarization conversion unit 511, four polarization conversion unit groups 51 of radiating element 1.
Polarization conversion unit 511 is live width S3 is 1.0mm, through the symmetrical structure of the line segment formation of several times bending.The square of the circumference of this symmetrical structure to be length of side S1 be 9mm, and on symmetry axis, leave the square notch 512 that length of side S2 is 3mm.
The sensing of the square notch 512 of the polarization conversion unit 511 in each polarization conversion unit group 51 is identical, all point to or backward radiation cell orientation, the sensing of polarization conversion unit 511 square notch 512 therefore in adjacent polarized converting unit group 51 differs 90 °.The polarization of ele direction that adjacent converting unit group 51 reflects offsets mutually on the contrary, thus effectively reduces radar cross section.
Embodiment 2:
Embodiment 2 is identical with embodiment 1 structure, only adjusts partial parameters.
The length of side M=19mm of square area 6; The live width S3=0.9mm of polarization conversion unit 511
Embodiment 3:
Embodiment 3 is identical with embodiment 1 structure, only adjusts partial parameters.
The length of side M=20mm of square area 6; The live width S3=1.1mm of polarization conversion unit 511
Advantage of the present invention further illustrates by the emulation of embodiment 1:
1, content is emulated
1.1) utilize the S parameter of the polarization conversion unit 511 of business simulation software CST Microwave Studio 2011 pairs of above-described embodiments 1 to carry out simulation calculation within the scope of 3.0-12.0GHz, result as shown in Figure 5.
1.2) utilize the S parameter of business simulation software CST Microwave Studio 2011 pairs of above-described embodiments 1 to carry out simulation calculation within the scope of 4.0-4.6GHz, result as shown in Figure 6.
1.3) far field radiation pattern of business simulation software CST Microwave Studio 2011 pairs of above-described embodiments 1 is utilized to carry out simulation calculation at 4.3GHz place, result as shown in Figure 7, wherein: 7 (a), for embodiment micro-strip paster antenna is at the antenna pattern in x-z face, 7 (b) is for embodiment micro-strip paster antenna is at the antenna pattern in y-z face.
1.4) utilize business simulation software CST Microwave Studio 2011 pairs of above-described embodiments 1 to carry out simulation calculation in the monostatic radar cross section at 4.3GHz place, and incoming electromagnetic wave frequency is identical with the operating frequency of antenna.Irradiating angle change from-90 ° to+90 ° of incident electromagnetic wave.The curve that the monostatic radar cross section that simulation calculation obtains changes with angle as shown in Figure 8.Wherein: 8 (a) is for embodiment 1 micro-strip paster antenna is under x polarized electromagnetic wave irradiates, with the monostatic radar cross section of angle change and the comparison diagram of existing micro-strip paster antenna, 8 (b) for embodiment 1 micro-strip paster antenna is under y polarized electromagnetic wave irradiates, along with monostatic radar cross section and the comparison diagram of existing micro-strip paster antenna of angle change.
1.5) utilize the monostatic radar cross section of business simulation software CST Microwave Studio 2011 pairs of above-described embodiments 1 in electromagnetic wave vertical irradiation situation to carry out simulation calculation, incoming electromagnetic wave frequency changes from 2GHz to 12GHz.Result as shown in Figure 9, wherein: 9 (a) is for embodiment 1 micro-strip paster antenna is under x polarized electromagnetic wave vertical irradiation, with the monostatic radar cross section of frequency change and the comparison diagram of existing micro-strip paster antenna, 9 (b) for embodiment 1 micro-strip paster antenna is under y polarized electromagnetic wave vertical irradiation, with the monostatic radar cross section of frequency change and the comparison diagram of existing micro-strip paster antenna.
2, simulation result
With reference to Fig. 5, the polarization conversion unit used in inventive antenna can be, and x polarized electromagnetic wave is converted to y polarized electromagnetic wave by these four frequency places of 4.2GHz, 6.75GHz, 9GHz and 12GHz.Because its structure is diagonally symmetrical, therefore for y polarization incident electromagnetic wave, also can be converted to x polarized electromagnetic wave accordingly, realize polarization conversion.
With reference to Fig. 6, inventive antenna, when S11 is greater than 10dB, has the working band of 4.23GHz-4.39GHz, relative bandwidth 4%, substantially overlap with the resonance frequency of existing micro-strip paster antenna, this illustrates that inventive antenna has the impedance bandwidth similar with existing micro-strip paster antenna.
With reference to Fig. 7 (a) and Fig. 7 (b), the greatest irradiation directive gain of inventive antenna reaches 5.6dBi, gain in greatest irradiation direction only to decline 0.5dBi relative to existing micro-strip paster antenna, there is no significantly sacrificing, and the greatest irradiation direction of inventive antenna is all the time along the normal direction of antenna surface.Illustrate that inventive antenna overlaps substantially with the far field radiation pattern of existing micro-strip paster antenna.
With reference to Fig. 8 (a) and 8 (b), when with antenna, there is the plane wave of identical operating frequency, when irradiating antenna surface along certain angle, good radar signal interception system can be realized in the angular range of ± 25 °, the normal direction of greatest irradiation direction and antenna surface can realize the radar signal interception system of 13dBsm, ensure that the low radar cross section characteristic that the maintenance of antenna within the scope of this angular domain is good.
With reference to Fig. 9 (a) and 9 (b), when the plane wave vertical irradiation that x polarization and y polarize is to antenna surface, the radar cross section of micro-strip paster antenna of the present invention obtains good reducing in very wide frequency band, and reduce the working band that scope covers antenna, ensure that antenna is under multipolarization and wide band situation, still can realize low radar cross section characteristic.
Above simulation result illustrates that inventive antenna under the prerequisite ensureing good radiance, can realize the radar cross section lower than existing micro-strip paster antenna.
More than describe and embodiment; be only preferred embodiment of the present invention; do not form any limitation of the invention; obviously for those skilled in the art; after having understood content of the present invention and design principle; all when based on principle of the present invention and structure, the various correction in form and in details and change may be carried out, but these corrections based on inventive concept and change are still within the protection range of claim of the present invention.
Claims (6)
1., based on a low radar cross section micro-strip paster antenna for polarization conversion, comprise radiating element (1), dielectric-slab (2), metal floor (3) and coaxial fitting (4); The upper and lower surface of described dielectric-slab (2) is printed with respectively radiating element (1) and metal floor (3), it is characterized in that: be also printed with polarization conversion surface (5) at the upper surface of dielectric-slab (2), this polarization conversion surface (5) is made up of four polarization conversion unit groups (51), these polarization conversion unit groups are distributed in the surrounding of radiating element (1), the middle formation length of side is the square area (6) of M, and the span of M is 19-23mm; Each polarization conversion unit group (51) comprises several polarization conversion unit (511), polarization conversion unit (511) is the circumference be made up of a line segment bent through several times is foursquare symmetrical structure, symmetry axis leaves square notch (512), and the square notch (512) of polarization conversion unit (511) in each polarization conversion unit group (51) is pointed to identical.
2. the low radar cross section micro-strip paster antenna based on polarization conversion according to claim 1, it is characterized in that polarization conversion unit group (51) is that arrangement is formed in the cycle such as X-direction and Y-direction by n polarization conversion unit (511), n >=8, the default polarization conversion unit (511) in summit place near radiating element (1), for the formation of the square area (6) in the middle of polarization conversion surface (5); The sensing of polarization conversion unit (511) square notch (512) in adjacent polarized converting unit group (51) differs 90 °.
3. the low radar cross section micro-strip paster antenna based on polarization conversion according to claim 1, it is characterized in that polarization conversion unit (511) has four resonance frequencys, its lowest resonant frequency is identical with the operating frequency of existing micro-strip paster antenna.
4. the low radar cross section micro-strip paster antenna based on polarization conversion according to claim 1, it is characterized in that the circumference square size dimension S1 of polarization conversion unit (511) is 9mm, square notch (512) size dimension S2 is 3mm, and the span of the feature sizes S3 of bending line segment is 0.9-1.1mm.
5. the low radar cross section micro-strip paster antenna based on polarization conversion according to claim 3, it is characterized in that the shape of radiating element (1) is for square, the length of side is 15.6mm.
6. the low radar cross section micro-strip paster antenna based on polarization conversion according to claim 1, it is characterized in that the outer core (42) of coaxial fitting (4) is connected with metal floor (3), inner core (41) is connected with radiating element (1) through dielectric-slab (2), forms base drive structure.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107069232A (en) * | 2016-12-28 | 2017-08-18 | 广东精点数据科技股份有限公司 | The RCS reducing techniques of micro-strip paster antenna |
| CN107069233A (en) * | 2016-12-28 | 2017-08-18 | 广东精点数据科技股份有限公司 | Micro-strip paster antenna with low RCS characteristics |
| CN107069238A (en) * | 2016-12-28 | 2017-08-18 | 广东精点数据科技股份有限公司 | Polarized rotation blade unit and polarized rotation piece |
| CN107579346A (en) * | 2017-08-23 | 2018-01-12 | 西安电子科技大学 | A kind of microstrip antenna of the low radar cross section of ultra wide band |
| CN107591617A (en) * | 2017-08-29 | 2018-01-16 | 电子科技大学 | A kind of SIW back of the body chamber slot antennas of mixing AMC tessellates structure loading |
| CN108923125A (en) * | 2018-06-27 | 2018-11-30 | 河南安伏众电子科技有限公司 | Low radar scattering cross section micro-strip paster antenna based on frequency-selective surfaces |
| CN109980359A (en) * | 2019-03-24 | 2019-07-05 | 西安电子科技大学 | The low RCS antenna in broadband based on polarization conversion surface |
| CN115101939A (en) * | 2022-06-13 | 2022-09-23 | 电子科技大学 | Broadband RCS (radar cross section) reduced antenna based on polarization rotation super surface |
| CN109980359B (en) * | 2019-03-24 | 2024-04-16 | 西安电子科技大学 | Broadband low-RCS antenna based on polarization conversion surface |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107069232A (en) * | 2016-12-28 | 2017-08-18 | 广东精点数据科技股份有限公司 | The RCS reducing techniques of micro-strip paster antenna |
| CN107069233A (en) * | 2016-12-28 | 2017-08-18 | 广东精点数据科技股份有限公司 | Micro-strip paster antenna with low RCS characteristics |
| CN107069238A (en) * | 2016-12-28 | 2017-08-18 | 广东精点数据科技股份有限公司 | Polarized rotation blade unit and polarized rotation piece |
| CN107579346A (en) * | 2017-08-23 | 2018-01-12 | 西安电子科技大学 | A kind of microstrip antenna of the low radar cross section of ultra wide band |
| CN107579346B (en) * | 2017-08-23 | 2019-10-25 | 西安电子科技大学 | A kind of microstrip antenna of the low radar cross section of ultra wide band |
| CN107591617A (en) * | 2017-08-29 | 2018-01-16 | 电子科技大学 | A kind of SIW back of the body chamber slot antennas of mixing AMC tessellates structure loading |
| CN107591617B (en) * | 2017-08-29 | 2019-11-05 | 电子科技大学 | A kind of SIW back chamber slot antenna of mixing AMC tessellate structure load |
| CN108923125A (en) * | 2018-06-27 | 2018-11-30 | 河南安伏众电子科技有限公司 | Low radar scattering cross section micro-strip paster antenna based on frequency-selective surfaces |
| CN109980359A (en) * | 2019-03-24 | 2019-07-05 | 西安电子科技大学 | The low RCS antenna in broadband based on polarization conversion surface |
| CN109980359B (en) * | 2019-03-24 | 2024-04-16 | 西安电子科技大学 | Broadband low-RCS antenna based on polarization conversion surface |
| CN115101939A (en) * | 2022-06-13 | 2022-09-23 | 电子科技大学 | Broadband RCS (radar cross section) reduced antenna based on polarization rotation super surface |
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