CN107579346A - A kind of microstrip antenna of the low radar cross section of ultra wide band - Google Patents
A kind of microstrip antenna of the low radar cross section of ultra wide band Download PDFInfo
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- CN107579346A CN107579346A CN201710727439.8A CN201710727439A CN107579346A CN 107579346 A CN107579346 A CN 107579346A CN 201710727439 A CN201710727439 A CN 201710727439A CN 107579346 A CN107579346 A CN 107579346A
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Abstract
The present invention proposes a kind of microstrip antenna of the low radar cross section of ultra wide band, for solving the technical problem of existing microstrip antenna decrement radar cross section narrow bandwidth.Including medium substrate, metal floor, polarization conversion surface, radiating element and coaxial fitting；Metal floor is printed on the lower surface of medium substrate, polarization conversion surface is printed on the upper surface of medium substrate, the upper center position of medium substrate is provided with rectangular cavities, the radiating element fixed with coaxial fitting output end is provided with above the cavity, polarization conversion surface is made up of four polarization conversion unit groups, each polarization conversion unit group include several point shape units that successively decrease, and the orientation of point shape unit that successively decreases in adjacent polarized converting unit group differs 900.The present invention has ultra wide band reduces microstrip antenna radar cross section stable performance the advantages of, reduces the electromagnetic interference between antenna in the antenna system complicated available for electromagnetic environment in broadband.
Description
Technical field
The invention belongs to antenna technical field, it is related to a kind of microstrip antenna of the low radar cross section of ultra wide band, available for electromagnetism
Electromagnetic interference in the complicated antenna system of environment in broadband between reduction antenna.
Background technology
In the communications field now, signal transmitting and reception system are most important composition portions in whole communications platform
Point, antenna is the part of core in the system.With the development of wireless technology, the electromagnetic environment residing for antenna is also more and more multiple
It is miscellaneous, between antenna interfering as influence signal transmitting and receiving an important factor for.The radiation characteristic of antenna determines its transceiving electromagnetic
The ability of ripple, and its scattering properties has important influence to its Electro Magnetic Compatibility, it characterizes reflection energy of the antenna to incoming wave
Power, the antenna having compared with weak scattering characteristic can effectively reduce its own interference to other antenna transmission signals, strengthen antenna
Between Electro Magnetic Compatibility.
The scattering of antenna come quantitatively characterizing, generally includes two parts generally by radar cross section：A part is with scattering day
The unrelated structural mode scattering field of linear load situation, it is scattered field when antenna connects matched load, its scattering mechanism with it is general
Logical scattering object is identical；Another part is then with the antenna mode scattering field of the loading condition change of antenna, and it is due to load
The power for mismatching and reflecting with antenna caused scattered field through antenna re-radiation, this is antenna as a loaded scatters body
And distinctive scattered field.
Microstrip antenna is the antenna for adding conductor sheet on the dielectric substrate with conductor earth plate and being formed, and utilizes micro-strip
Line or coaxial feeding, radio frequency electromagnetic field is encouraged between conductor patch and earth plate, and passed through paster surrounding and earth plate
Between gap to external radiation.Compared with conventional aerial, microstrip antenna is in light weight, small volume, thin profile, easy to process.Chinese Shen
Please publication No. CN 104701613A, the patent application of entitled " the low radar cross section micro-strip paster antenna based on polarization conversion ",
Disclose a kind of low radar cross section micro-strip paster antenna based on polarization conversion, including radiating element, dielectric-slab, metal floor,
Coaxial fitting and polarization conversion surface；The upper surface printing radiating element of dielectric-slab and polarization conversion surface, the printing of its lower surface
Metal floor, polarization conversion surface are made up of four polarization conversion unit groups, and centre has square area；Each polarization conversion
Unit group includes and the polarization conversion unit of square notch is left on several symmetry axis, the pole in each polarization conversion unit group
The square notch sensing for changing converting unit is identical；The existing microstrip antenna is only in 4.2GHz, 6.75GHz, 9GHz and 12GHz
This four frequencies nearby reduce radar cross section in frequency band, reduce narrow bandwidth, it is difficult to electromagnetic interference between antenna is reduced in broadband.
The content of the invention
A kind of the defects of it is an object of the invention to overcome above-mentioned prior art to exist, it is proposed that the low radar cross section of ultra wide band
Microstrip antenna, for solving the technical problem of existing microstrip antenna decrement radar cross section narrow bandwidth.
To achieve the above object, the technical solution adopted by the present invention is：
A kind of microstrip antenna of the low radar cross section of ultra wide band, including medium substrate 1 and it is printed on the lower surface of medium substrate 1
Metal floor 2, it is characterised in that：The upper surface of the medium substrate 1 is printed with polarization conversion surface 3, upper center position
Rectangular cavities of the cross section for square are provided with, the bottom of the cavity is provided with the coaxial fitting 5 by medium substrate 1, on
Side is provided with the radiating element 4 fixed with the output end of coaxial fitting 5；The polarization conversion surface 3 surrounds rectangular cavities by four
The arrangement of polarization conversion unit group 31 form, each polarization conversion unit group 31 is arranged by n in the cycle such as X-direction and Y-direction
Point shape unit 311 that successively decreases form, n >=8, and in the default one point shape unit 311 that successively decreases at the rectangular cavities；It is described to successively decrease
The square that point shape unit 311 is connected by k arranged in a straight line and summits is formed, and the ratios such as each square length of side is from centre to both sides are passed
Subtract, wherein k is the odd number more than or equal to three；A point orientation for shape unit 311 of successively decreasing in adjacent polarized converting unit group 31
90 ° of difference；The radiating element 4 is located in the plane at the place of polarization conversion surface 3.
A kind of microstrip antenna of the low radar cross section of above-mentioned ultra wide band, the radiating element 4, it is shaped as size dimension W=
8mm square, and geometric center is located in the longitudinal center axis of rectangular cavities.
A kind of microstrip antenna of the low radar cross section of above-mentioned ultra wide band, the rectangular cavities, the size dimension M=of its cross section
12-20mm, height dimension H0=1mm.
A kind of microstrip antenna of the low radar cross section of above-mentioned ultra wide band, point shape unit 311 that successively decreases, the intermediate square length of side
Size A=2.0-2.2mm, it is t=0.5 to wait than degradation factor.
A kind of microstrip antenna of the low radar cross section of above-mentioned ultra wide band, the medium substrate 1, its surface configuration are square.
The present invention compared with prior art, has the following advantages that：
1st, the present invention to size square in point shape unit that successively decreases by optimizing, in x polarization or y very in broadband
The electromagnetic wave irradiation of polarization increases radar to the electromagnetic wave that y polarization or x polarization can be efficiently converted in polarization conversion unit group
The decrement bandwidth in section, so as to reduce the electromagnetic interference between antenna in broadband.
2nd, the present invention makes the resonance frequency band of antenna and a point shape cell operation of successively decreasing by being optimized to rectangular cavities size
Frequency is identical, so as to reduce antenna radar section in antenna operating band.And because point shape unit that successively decreases has ultra-wide
Band characteristic, reduces in antenna operating band and effectively radar cross section outside frequency band.
Brief description of the drawings
Fig. 1 is the sectional structure chart of inventive antenna；
Fig. 2 is the overlooking structure figure of the embodiment of the present invention 1；
Fig. 3 is point structural representation for shape unit that successively decreases in Fig. 2；
Fig. 4 is the reflectance factor of the embodiment of the present invention 1 and cross polarization conversion ratio PCR simulation result figure；
Fig. 5 is the same polarization reflectance factor simulation result figure of the embodiment of the present invention 1；
Fig. 6 is the embodiment of the present invention 1 | S11 | curve simulation result figure；
Fig. 7 is antenna pattern of the embodiment of the present invention 1 in xoz faces and yoz faces；
Fig. 8 is the monostatic radar that the embodiment of the present invention 1 changes under x polarization and the irradiation of y polarized electromagnetic waves with frequency respectively
Section simulation result figure.
Embodiment
The invention will be further described with specific embodiment below in conjunction with the accompanying drawings.
Embodiment 1：
Reference picture 1, a kind of microstrip antenna of the low radar cross section of ultra wide band, including medium substrate 1, metal floor 2, polarization turn
Change surface 3, radiating element 4 and coaxial fitting 5；Medium substrate 1 uses dielectric constant as 2.62, length of side L=65mm square
Sheet material, its thickness H=2mm；Metal floor 2 is printed on the lower surface of medium substrate 1, the shapes and sizes of the metal floor 2 with
Medium substrate 1 is identical；Polarization conversion surface 3 is printed on the upper surface of medium substrate 1；The upper center position of medium substrate 1 is set
It is equipped with rectangular cavities of the cross section for square, square length of side M=17mm, housing depth H0=1mm, rectangular cavities and medium
The longitudinal center axis of substrate 2 overlaps, and so as to improve the resonance frequency of microstrip antenna, makes the resonance frequency band of antenna and a point shape of successively decreasing
Cell operation frequency is identical；Coaxial fitting 5 by medium substrate 1 is installed in the bottom of cavity, the center of medium substrate 1 is inclined
X-axis forward position is provided with via, and the inner core 51 of coaxial fitting 5 passes through the via and the radiating element 4 being arranged on above cavity
Welding, the outer core 52 of coaxial fitting 5 are connected with metal floor, form base drive structure；The profile of radiating element 4 is length of side W
=8mm square-shaped metal paster, the geometric center of radiating element 4 are located on rectangular cavities longitudinal axis, and turn positioned at polarization
Change in the plane at the place of surface 3.
Reference picture 2, the polarization conversion surface 3 is by being distributed in four 31 groups of polarization conversion unit groups of rectangular cavities surrounding
Into each polarization conversion unit group 31 successively decreases point shape unit 311 in the cycle such as x directions and y directions arrangement structure by n >=8 respectively
Into, the present embodiment n=24, while the performance of antenna miniaturization and low radar scattering is taken into account, each polarization conversion unit group 31 is leaned on
The default one point shape unit 311 that successively decreases at nearly rectangular cavities, so as to which four polarization conversion unit groups 31 form one and rectangular cavity
Body upper surface shape size identical square area, point shape unit 311 that successively decreases in each polarization conversion unit group 31 arrange
Direction is identical, and parallel to the diagonal of medium substrate 1, point shape unit 311 that successively decreases in adjacent polarized converting unit group 31
Orientation differs 90 °, and the equal polarised direction of the electromagnetism wave amplitude that adjacent polarized converting unit group 31 is reflected mutually offsets on the contrary,
So as to be effectively reduced radar cross section.
Reference picture 3, point shape unit 311 that successively decreases are made up of the square that five arranged in a straight line and summit connects, five
Point-blank, the ratios such as each square length of side is from centre to both sides successively decrease the diagonal of square, wait than degradation factor t=
0.5, intermediate square size dimension A=2.1mm, point circumference of shape unit 311 that successively decreases is length of side P=6mm square.
Embodiment 2：
The present embodiment is identical with the structure of embodiment 1, and only partial parameters are adjusted：
Rectangular cavities cross section length of side M=12mm, the middle length of side A=2.0mm for point shape unit 311 that successively decreases.
Embodiment 3：
The present embodiment is identical with the structure of embodiment 1, and only partial parameters are adjusted：
Rectangular cavities cross section length of side M=20mm, the middle length of side A=2.2mm for point shape unit 311 that successively decreases.
Below in conjunction with emulation experiment, the technique effect of the present invention is described further：
1st, simulated conditions and content：
1.1 using business simulation software HFSS_15.0 to point reflectance factor of shape unit and the polarization of successively decreasing in examples detailed above 1
Conversion ratio carries out simulation calculation in the range of 8GHz-34GHz, as a result as shown in Figure 4.
The 1.2 same polarization reflectance factor using business simulation software HFSS_15.0 to point shape unit that successively decreases in examples detailed above 1
Simulation calculation is carried out in the range of 8GHz-34GHz, as a result as shown in Figure 5.
1.3 using business simulation software HFSS_15.0 to the inventive antenna of examples detailed above 1 and reference antenna | S11 |
12GHz is to simulation calculation is carried out in 16GHz frequency bands, as a result as shown in Figure 6；Reference antenna is except no printing polarization conversion table
Face, remaining all structure snd size are identical with the inventive antenna of embodiment 1.
1.4 are carried out at 14GHz using business simulation software HFSS_15.0 to the far field radiation pattern of examples detailed above 1
Design of Simulation, as a result as shown in fig. 7, wherein：Fig. 7 (a) is the inventive antenna of embodiment 1 and reference antenna in xoz surface radiation sides
To the comparison diagram of figure, Fig. 7 (b) is the comparison diagram of the inventive antenna of embodiment 1 and reference antenna in yoz surface radiation directional diagrams.
1.5 utilize Dan Zhanleis of the business simulation software HFSS_16.0 to examples detailed above 1 in the case of electromagnetic wave vertical irradiation
Simulation calculation is carried out up to section, the frequency of incident electromagnetic wave changes from 8GHz to 28GHz.As a result as shown in figure 8, wherein Fig. 8 (a)
Be the inventive antenna of embodiment 1 and reference antenna under x polarized electromagnetic wave vertical irradiations, the monostatic radar section that changes with frequency
Comparison diagram；Wherein Fig. 8 (b) be the inventive antenna of embodiment 1 and reference antenna under y polarized electromagnetic wave vertical irradiations, with frequency
The comparison diagram in the monostatic radar section of rate change；
2nd, analysis of simulation result：
Referring to Fig. 4, under conditions of cross polarization reflectance factor is more than 80%, successively decrease point shape unit in inventive antenna
Working band is 10.45GHz-32.15GHz (relative bandwidth 101.9%).Due to its structure be it is diagonally symmetrical, because
This polarizes as the transfer characteristic of x polarization incident electromagnetic waves for y.
Reference picture 5, when the plane wave vertical irradiation of v polarization and u polarization is to antenna surface, same polarization conversion coefficient exists
There are three resonant frequency points at 11GHz, 22.2GHz and 32.6GHz, these three Frequency points correspond to the three of cross polarization reflectance factor
Individual peak value.
With reference to figure 6, inventive antenna exists | S11 | less than under conditions of -10dB, there is 12.9GHz-15.7GHz work
Frequency band, essentially coincided with reference antenna bandwidth of operation, this explanation inventive antenna has good impedance bandwidth.
With reference to figure 7 (a) and Fig. 7 (b), inventive antenna essentially coincides with the antenna pattern main lobe referred to, and this hair
Tomorrow line greatest irradiation direction all the time perpendicular to radiation floor surface, maximum gain 7.13dB, this explanation inventive antenna
With good antenna pattern characteristic.
Reference picture 8 (a) and Fig. 8 (b), when the plane wave vertical irradiation of x polarization and y polarization is to antenna surface, the present invention
Antenna is above 6.5dB compared to reference antenna in the interior radar signal interception system amount of 8GHz-28GHz frequency bands (relative bandwidth 105%), this
Illustrate that inventive antenna is realizing low radar cross section characteristic very much in broadband, compared with existing microstrip antenna, subtract in radar cross section
In the case that contracting amount is equal, relative bandwidth is wider.
Above description and examples, it is only the preferred embodiment of the present invention, does not form any limitation of the invention, it is clear that right
, all may be in the original based on the present invention after present invention and design principle has been understood for one of skill in the art
In the case of reason and structure, carry out in form and the various modifications and variations in details, but these are based on inventive concept
Modifications and variations are still within the scope of the claims of the present invention.
Claims (5)
1. a kind of microstrip antenna of the low radar cross section of ultra wide band, including medium substrate (1) and it is printed on medium substrate (1) following table
The metal floor (2) in face, it is characterised in that：The upper surface of the medium substrate (1) is printed with polarization conversion surface (3), upside
Center is provided with rectangular cavities of the cross section for square, and the bottom of the cavity is provided with by the same of medium substrate (1)
Shaft coupling (5), top are provided with the radiating element (4) fixed with coaxial fitting (5) output end；The polarization conversion surface (3)
Formed by four polarization conversion unit group (31) arrangements around rectangular cavities, each polarization conversion unit group (31) is by n in X
Point shape unit (311) that successively decreases of the cycle such as direction and Y-direction arrangement is formed, n >=8, and close to default one at rectangular cavities
Successively decrease a point shape unit (311)；The square that point shape unit (311) is connected by k arranged in a straight line and summits that successively decreases forms, respectively
Ratio successively decreases the square length of side from centre to both sides etc., and wherein k is the odd number more than or equal to three；Adjacent polarized converting unit group (31)
In point shape unit (311) that successively decreases orientation differ 90 °；The radiating element (4) is located at where polarization conversion surface (3)
Plane on.
A kind of 2. microstrip antenna of the low radar cross section of ultra wide band according to claim 1, it is characterised in that：The radiation is single
First (4), it is shaped as size dimension W=8mm square, and geometric center is located in the longitudinal center axis of rectangular cavities.
A kind of 3. microstrip antenna of the low radar cross section of ultra wide band according to claim 1, it is characterised in that：The rectangular cavity
Body, the size dimension M=12-20mm of its cross section, height dimension H0=1mm.
4. the microstrip antenna of the low radar cross section of a kind of ultra wide band according to claim 1, it is characterised in that successively decrease a point shape list
First (311), intermediate square size dimension A=2.0-2.2mm, it is t=0.5 to wait than degradation factor.
A kind of 5. microstrip antenna of the low radar cross section of ultra wide band according to claim 1, it is characterised in that：The medium base
Plate (1), its surface configuration are square.
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| Application Number | Priority Date | Filing Date | Title |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710727439.8A CN107579346B (en) | 2017-08-23 | 2017-08-23 | A kind of microstrip antenna of the low radar cross section of ultra wide band |
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| CN107579346B CN107579346B (en) | 2019-10-25 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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| US3938151A (en) * | 1970-08-14 | 1976-02-10 | The United States Of America As Represented By The Secretary Of The Navy | Passive radar decoy having a large cross section |
| US6160522A (en) * | 1998-04-02 | 2000-12-12 | L3 Communications Corporation, Randtron Antenna Systems Division | Cavity-backed slot antenna |
| CN102130377A (en) * | 2011-01-26 | 2011-07-20 | 浙江大学 | Three-frequency medium resonant antenna with function of coaxial feed |
| CN104701613A (en) * | 2015-03-14 | 2015-06-10 | 西安电子科技大学 | Low-RCS (radar cross section) microstrip patch antenna based on polarization conversion |
| CN106410425A (en) * | 2016-12-06 | 2017-02-15 | 复旦大学 | Ultra-wideband full polarization full-angle rotating parabolic gradient electromagnetic stealth super-surface and design method thereof |
-
2017
- 2017-08-23 CN CN201710727439.8A patent/CN107579346B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3938151A (en) * | 1970-08-14 | 1976-02-10 | The United States Of America As Represented By The Secretary Of The Navy | Passive radar decoy having a large cross section |
| US6160522A (en) * | 1998-04-02 | 2000-12-12 | L3 Communications Corporation, Randtron Antenna Systems Division | Cavity-backed slot antenna |
| CN102130377A (en) * | 2011-01-26 | 2011-07-20 | 浙江大学 | Three-frequency medium resonant antenna with function of coaxial feed |
| CN104701613A (en) * | 2015-03-14 | 2015-06-10 | 西安电子科技大学 | Low-RCS (radar cross section) microstrip patch antenna based on polarization conversion |
| CN106410425A (en) * | 2016-12-06 | 2017-02-15 | 复旦大学 | Ultra-wideband full polarization full-angle rotating parabolic gradient electromagnetic stealth super-surface and design method thereof |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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| CN107579346B (en) | 2019-10-25 |
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