CN211957922U - Dual-waveband multi-polarization common-aperture antenna array for synthetic aperture radar system - Google Patents
Dual-waveband multi-polarization common-aperture antenna array for synthetic aperture radar system Download PDFInfo
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- CN211957922U CN211957922U CN202021136700.0U CN202021136700U CN211957922U CN 211957922 U CN211957922 U CN 211957922U CN 202021136700 U CN202021136700 U CN 202021136700U CN 211957922 U CN211957922 U CN 211957922U
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Abstract
The utility model discloses a dual-waveband multi-polarization common-aperture antenna array used in a synthetic aperture radar system, which relates to the technical field of radio frequency antennas, and designs a common-aperture antenna array capable of working under L waveband and S waveband aiming at the application in the synthetic aperture radar system, and provides the following proposal, comprising an L waveband 2X 2 cross array structure and an S waveband 3X 3 circular array structure, wherein the common-aperture antenna is integrally in a three-layer structure form, the bottommost layer is a ground plane, the middle layer and the upper layer are dielectric plates with the same thickness and dielectric constant, the L waveband antenna array is printed on the upper surface of the upper layer medium, the S waveband antenna array is printed on the upper surface of the middle layer medium, and the two waveband antennas have a certain height from the ground plane, the utility model is novel in design and simple in operation, and increases the application potential of the synthetic aperture radar antenna in L waveband and S waveband, can be suitable for different environmental conditions.
Description
Technical Field
The utility model belongs to the technical field of the radio frequency antenna, especially, relate to a dual waveband multipolar common-bore antenna array for among synthetic aperture radar system.
Background
The antenna, one of the indispensable front-end devices of the communication system, can radiate and receive electromagnetic waves, and has wide application and important function in the fields of satellite communication, navigation positioning, medical imaging, home electric industry, industry and the like. The first antennas were constructed from a simple metal sheet and have slowly evolved into complex structural components and even systems as the push and demand of modern society has increased, and various antenna forms have emerged.
In the synthetic aperture radar system, the application of the common-caliber antenna is the most extensive, two or even multiple kinds of work are shared in the same caliber surface by the different waveband antennas through reasonable layout in a limited space range, and mutual coupling between the different waveband antennas is reduced, so that each waveband antenna can work independently. And for the antenna capable of working under different polarization modes, the antenna can be more suitable for different environments and conditions, thereby ensuring the safe transmission of information. Therefore, designing a common-aperture antenna capable of operating under different band conditions and having different polarization modes has become an important development trend of the antenna for the application in the synthetic aperture radar system, and has received attention from more and more related researchers.
SUMMERY OF THE UTILITY MODEL
The utility model provides a dual band multipolar common aperture antenna array for among synthetic aperture radar system is through adopting L wave band antenna unit and S wave band antenna unit to constitute common aperture antenna array for a new technical approach is provided in synthetic aperture radar system' S application, and adopts different feed mode to realize that two kinds of different wave band antennas can both work under different polarization modes, has increased the application potentiality of synthetic aperture radar antenna at L wave band and S wave band.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the dual-band multi-polarization common-aperture antenna array used in the synthetic aperture radar system comprises an L-band 2 x 2 cross array structure and an S-band 3 x 3 circular array structure, wherein the common-aperture antenna is integrally in a three-layer structure form, the bottommost layer is a ground plane, a middle layer and an upper layer are dielectric plates with the same thickness and dielectric constant, the L-band antenna array is printed on the upper surface of an upper-layer medium, the S-band antenna array is printed on the upper surface of a middle-layer medium, two band antennas have a certain height from the ground plane, the L-band antenna unit feeds power by adopting four feeding points, the S-band antenna unit also feeds power by adopting four feeding points, and each unit of the common-aperture antenna array feeds power to the antenna by adopting a coaxial feeding form.
Preferably, the four feeding points of the L-band antenna unit feed the antenna with currents having the same amplitude and sequentially differing in phase by ninety degrees, and the distance between every two opposite feeding points is the same, and the L-band antenna array can respectively work in a left-hand circular polarization mode and a right-hand circular polarization mode.
Preferably, circular ring gaps with a certain size are dug in the vicinity of four feeding points of the L-band antenna unit, and the dug circular ring gaps are equal in size, so that the overall bandwidth performance of the antenna can be improved.
Preferably, the four feeding points of the S-band antenna unit feed the antenna with currents having the same amplitude and sequentially differing in phase by ninety degrees, and the distance between every two opposite feeding points is the same, and the S-band antenna array can respectively work in a left-hand circular polarization mode and a right-hand circular polarization mode.
Preferably, circular ring gaps with a certain size are dug in the vicinity of four feeding points of the S-band antenna unit, and the dug circular ring gaps are equal in size, so that the overall bandwidth performance of the antenna can be improved.
Preferably, each unit of the aperture antenna array feeds power to the antenna in a coaxial feed mode, so that the overall structure of the antenna is relatively simple, and the influence of the design of a feed network on the overall performance of the antenna is simplified.
Compared with the prior art, the beneficial effects of the utility model are that: the utility model discloses a setting to unit feed point phase place in two wave band antenna arrays can let L wave band antenna and S wave band antenna work respectively under the circular polarization radiation pattern of two kinds of differences to two wave band antennas can both realize the free regulation and control between left-handed circular polarization to the dextrorotation circular polarization. The design adopts a double-layer structure, so that mutual coupling among antennas with different wave bands can be reduced, and the isolation among the antennas is improved; a circular ring gap with a certain size is dug near the feed point of the antenna unit, so that the antenna can work in a relatively wide bandwidth range; the coaxial feed mode is adopted to feed the two band antennas, so that the complexity of the whole antenna caused by the need of additionally designing a feed network is simplified, and the influence on the radiation performance of the antenna is reduced.
Drawings
Fig. 1 (a) and (b) are a top view and a side view, respectively, of a dual-band multi-polarization common-aperture antenna array for use in a synthetic aperture radar system according to the present invention;
FIG. 2 is a top view of an L-band antenna unit structure;
FIG. 3 is a top view of an S-band antenna unit structure;
FIG. 4 is a two-dimensional radiation pattern for left-handed circular polarization of the L-band antenna array under center frequency excitation;
FIG. 5 is a two-dimensional radiation pattern with right-hand circular polarization of the L-band antenna array dominant polarization under center frequency excitation;
FIG. 6 is a two-dimensional radiation pattern for left-handed circular polarization of an S-band antenna array under center frequency excitation;
fig. 7 is a two-dimensional radiation pattern with right-hand circular polarization dominant for an S-band antenna array under center frequency excitation.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.
Referring to fig. 1-7, the radius of the S-band circular patch antenna is r0, the sizes of the circular slots cut out from the four feeding points are the same, as shown by the shaded parts in the figure, the sizes of the outer diameter and the inner diameter of the circular slot are r1 and r2 respectively, the distance between every two opposite feeding points is d1, the center distance of each antenna unit is the same, the distance between two adjacent units is L1, the four feeding points of each unit have the same amplitude and the same phase difference of ninety degrees in turn, the antenna is fed by adopting a fifty-ohm standard coaxial line, and the height of the antenna distance to the ground plane is HS; each unit of the L-band cross antenna is fed by four feeding points with the same amplitude and phases which are sequentially different by ninety degrees, the distance between every two opposite feeding points is d2, the sizes of circular ring gaps dug by the four feeding points are the same, as shown by shaded parts in the figure, the sizes of the outer diameter and the inner diameter of each circular ring gap are r3 and r4 respectively, the center distance of each antenna unit is the same, the distance between every two adjacent units is L2, and the height of the antenna distance to the ground plane is HL. In order to reduce the side lobe size of each band antenna as much as possible and make the overall structure size of the common-aperture antenna relatively small, the distances L1 and L2 between the two band antenna units need to be optimally designed, and are generally selected to be about half wavelength of the center frequency.
In this embodiment, the center frequency of the S-band circular patch antenna is recorded asf 1The radius of the circular patch can be determined according to the formula
Is roughly calculated, wherein
H is the thickness of the dielectric plate, and other dimensional parameters r1, r2, d1, L1 and HS can be determined by selecting the center frequencyf 1And carrying out optimization comparison to obtain the product.
In this embodiment, the center frequency of the L-band cross patch antenna is recorded asf 2The size of the cross patch can be determined according to the formula of the rectangular patch antenna
Roughly calculated, other dimensional parameters r3, r4, d2, L2 and HL can be obtained through selecting the center frequencyf 2And carrying out optimization comparison to obtain the product.
The working principle is as follows:
as shown in fig. 2, the L-band antenna element is provided with four feeding points PL1、PL2、PL3、PL4Inputting currents with the same amplitude and phases of 0 °, 90 °, 180 ° and 270 ° in sequence, and combining the common-aperture array shown in fig. 1, so that the remaining three L-band antenna units also sequentially input currents with the same amplitude and phases of ninety degrees in a counterclockwise manner, and at this time, the S-band antenna array does not perform current input, so that a left-handed circularly polarized wave radiated outward by the L-band antenna array can be obtained, and a normalized radiation pattern diagram in which the L-band antenna is polarized in a left-handed circularly polarized manner is shown in fig. 4;
when respectively feeding four feeding points PL1、PL2、PL3、PL4Currents with the same amplitude and phases of 270 °, 180 °, 90 ° and 0 ° are input, the currents with the same amplitude and phases of ninety degrees are input into the remaining three L-band antenna units counterclockwise in sequence, and the current is not input into the S-band antenna array at this time, so that the L-band antenna array radiates right-hand circular polarized waves outwards, and a normalized radiation pattern diagram of the L-band antenna with the polarization being right-hand circular polarized is obtained as shown in fig. 5.
As shown in fig. 3, the S-band antenna element is provided with four feeding points PS1、PS2、PS3、PS4Currents with the same amplitude and phases of 0 °, 90 °, 180 ° and 270 ° are input, and the common aperture array shown in fig. 1 is combined, so that the currents with the same amplitude and phases of ninety degrees are also input to the remaining eight S-band antenna units counterclockwise in sequence, and at this time, the L-band antenna array does not perform current input, so that a left-handed circularly polarized wave radiated outward by the S-band antenna array can be obtained, and a normalized radiation pattern diagram in which the S-band antenna is polarized in a left-handed circularly polarized manner is shown in fig. 6;
when respectively feeding four feeding points PL1、PL2、PL3、PL4Currents with the same amplitude and phases of 270 °, 180 °, 90 ° and 0 ° are input, the currents with the same amplitude and phases of ninety degrees are input to the remaining eight S-band antenna units counterclockwise in sequence, and the L-band antenna array does not perform current input at this time, so that right-hand circularly polarized waves are radiated outward by the L-band antenna array, and a normalized radiation pattern diagram in which the S-band antenna is polarized to right-hand circularly polarized waves is obtained as shown in fig. 7.
The above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.
Claims (6)
1. A dual-band multi-polarization common-aperture antenna array used in a synthetic aperture radar system comprises an L-band 2 x 2 cross array structure, an S-band 3 x 3 circular array structure and a common-aperture antenna whole body, it is characterized in that the common caliber antenna is a three-layer structure, the bottom layer is a ground plane, the middle layer and the upper layer are dielectric plates with the same thickness and dielectric constant, the L-band antenna array is printed on the upper surface of the upper layer dielectric, the S-band antenna array is printed on the upper surface of the middle layer dielectric, the two band antennas have an isolation space from the ground plane, the L-band antenna unit adopts four feeding points for feeding, and a circular ring gap is dug near the feeding point, the S-band antenna unit also adopts four feeding points for feeding, and a circular ring gap is dug near the feeding point, and all the units of the common-caliber antenna array are fed to the antenna in a coaxial feeding mode.
2. The dual-band multi-polarization co-aperture antenna array for use in a synthetic aperture radar system of claim 1 wherein the L-band antenna elements feed the antenna at four feed points with currents of equal magnitude and sequentially ninety degrees out of phase, and wherein two opposite feed points maintain the same magnitude distance.
3. The dual-band multi-polarization co-aperture antenna array for use in a synthetic aperture radar system as claimed in claim 1, wherein a circular slot is cut out from each of the L-band antenna elements near each of the four feed points, and the width of the cut-out circular slots is equal.
4. The dual-band multi-polarization co-aperture antenna array for use in a synthetic aperture radar system of claim 1 wherein the S-band antenna elements feed the antenna at four feed points with currents of equal magnitude and sequentially ninety degrees out of phase, and wherein two opposite feed points maintain the same magnitude distance.
5. The dual band multi-polarization common aperture antenna array for use in a synthetic aperture radar system of claim 1, wherein a circular slot is dug out near each of the four feed points of the S-band antenna elements, and the width of the dug circular slot is equal.
6. The dual band multi-polarization co-aperture antenna array for use in a synthetic aperture radar system of claim 1 wherein the elements of said aperture antenna array are fed to the antenna using coaxial feed.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117175196A (en) * | 2023-03-16 | 2023-12-05 | 广州程星通信科技有限公司 | Common-caliber antenna array |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117175196A (en) * | 2023-03-16 | 2023-12-05 | 广州程星通信科技有限公司 | Common-caliber antenna array |
| CN117175196B (en) * | 2023-03-16 | 2024-04-12 | 广州程星通信科技有限公司 | Common-caliber antenna array |
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