CN114142207A - Foldable large-space ultra-wideband low-profile tightly-coupled array antenna - Google Patents
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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
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/08—Means for collapsing antennas or parts thereof
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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
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- H—ELECTRICITY
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- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/20—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements characterised by the operating wavebands
- H01Q5/25—Ultra-wideband [UWB] systems, e.g. multiple resonance systems; Pulse systems
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Abstract
The invention provides a foldable large-space ultra-wideband low-profile tightly-coupled array antenna, which comprises a reflecting plate and a plurality of dipole antenna units, wherein the reflecting plate is arranged on the outer side of the reflecting plate; the upper surface of the reflecting plate is provided with a dipole antenna unit, the dipole antenna unit comprises a grounding fork, a vertical polarization dipole and a horizontal polarization dipole, and the vertical polarization dipole and the horizontal polarization dipole form an L-shaped position relation; the dipole antenna units are independent from each other and have no staggered structure, so that the reflecting plate can be folded along the edges of the dipole antenna units. The invention provides a phased array antenna working in large unit spacing to reduce the number of active channels of the phased array antenna and reduce the cost; the dual-polarized ultra-wideband wide-angle scanning electrical performance is achieved; the dipole antenna unit has extremely low section height, and the array surface has a tightly coupled dipole array antenna with a folding function.
Description
Technical Field
The invention relates to the technical field of microwave antennas, in particular to a foldable large-space ultra-wideband low-profile tightly-coupled array antenna.
Background
With the rapid development of electronic information technology and the explosive increase of communication capacity, modern electronic systems are increasingly integrated and multifunctional, and the use of single or very few arrays to transmit and receive broadband or relatively discrete signals becomes the future development trend of phased array antennas. In addition to the electrical performance requirements of ultra-wideband, many carrier platforms often desire a phased array antenna with a compact volume and a low profile height due to limited space or for stealth purposes. In addition, in order to reduce the number of active channels of the phased array antenna and reduce the cost, the method for increasing the array unit spacing to the maximum extent under the precondition that no scanning grating lobe is generated is also an important index in the phased array design. These application requirements present many limitations and significant challenges to the design of phased array antennas.
Compared with the traditional ultra-wideband phased array antenna, such as a slot line antenna, the tightly coupled phased array can achieve the ultra-wideband performance and simultaneously better meet the application requirement of a low profile. However, in order to achieve the electrical performance of ultra-wideband wide-angle scanning, the pitch of the tightly coupled phased array antenna elements is usually small, and is generally smaller than half the wavelength of the high frequency. In addition, in order to realize strong capacitive coupling between units, an interleaving structure, such as an interdigital structure, an overlapping structure and the like, is often adopted between tightly coupled phased array units, and such an interleaving structure is difficult to apply to some loading platforms with limited space and a folding function in an expected array. Although the cross-sectional height of the tightly coupled phased array antenna is relatively low, a matching layer with a certain height is always required to be loaded above the aperture, and the overall cross-sectional height of the tightly coupled phased array antenna is greatly increased.
Disclosure of Invention
The invention adopts a tightly coupled dipole as a basic unit form, and provides the tightly coupled dipole array antenna which works in a large unit space, has dual-polarization ultra-wideband wide-angle scanning performance, extremely low section height and a wavefront folding function.
The invention aims to provide a foldable large-space ultra-wideband low-profile tightly-coupled array antenna which is characterized by comprising a reflecting plate and a plurality of dipole antenna units, wherein the reflecting plate is arranged on the outer side of the foldable large-space ultra-wideband low-profile tightly-coupled array antenna;
the upper surface of the reflecting plate is provided with the dipole antenna unit, the dipole antenna unit comprises a grounding fork, a vertical polarization dipole and a horizontal polarization dipole, and the vertical polarization dipole and the horizontal polarization dipole form an L-shaped position relation;
the dipole antenna units are independent from each other and have no staggered structure, so that the reflecting plate can be provided with a folding structure at the edge of each dipole antenna unit and folded;
the vertical polarization dipole and the horizontal polarization dipole comprise a feed balun and a radiator;
the feed balun is arranged at the bottom of the radiating body, the bottom of the feed balun is connected with the reflecting plate, and the top of the feed balun is provided with an opening;
a coaxial probe similar to a reversed L shape is embedded in the feed balun, and the longer end of the coaxial probe is connected with a coaxial connector arranged on the lower surface of the reflecting plate;
the radiator is provided with a left arm and a right arm, the two arms are not directly connected, and the two arms are respectively connected with the feed balun through the bottom.
Furthermore, an air cavity matched with the coaxial probe is arranged in the feed balun, and the widths of two sides of the air cavity are different.
Furthermore, the air cavity is provided with a plurality of expansion positions, the expansion positions are provided with polytetrafluoroethylene medium blocks, and the coaxial probes are fixed by the polytetrafluoroethylene medium blocks.
Furthermore, the ends of the outer sides of the left arm and the right arm of the radiator of the horizontal polarization dipole are thickened, so that the capacitive coupling among the horizontal polarization units is enhanced, the relatively insufficient low-frequency electrical property is optimized, and the bandwidth is expanded.
Furthermore, the left arm and the right arm of the radiator of the horizontally polarized dipole are in an asymmetric structure, and only the upper half part of the tail end of the left arm of the radiator of the horizontally polarized dipole is reserved.
Furthermore, the grounding fork is vertically arranged on the upper surface of the reflecting plate, and the tail end of the left arm of the radiator of the horizontally polarized dipole is surrounded by the grounding fork, so that the length of a resonant path is increased, and the coupling degree between units is considered.
Furthermore, triangular supports are additionally arranged at the connection positions of the feed balun and the two arms of the radiator respectively so as to ensure structural stability.
Further, the unit spacing of each dipole antenna unit along the azimuth plane and the pitch plane is 0.544 lambdah-scan and 0.66 lambdah-scan respectively, and the section height is 0.37 lambdah-scan; the λ h-scan represents the highest frequency wavelength in the wavefront scan state.
The beneficial effects of the invention include:
the array surface has a folding function, the tightly coupled phased array antenna units are not connected, the array surface can be folded along the unit boundary in a non-working state, the planar space occupied by the array is reduced, the purpose of storing or transporting in a compact size is achieved, and the form of the array surface has reducibility.
The unit spacing of the tightly coupled phased array antenna is very close to the theoretical maximum spacing under the premise of meeting the premise of no scanning grating lobe, the unit spacing of the tightly coupled phased array antenna is larger than the high-frequency half wavelength in both the azimuth plane and the pitching plane, and the unit spacing of the ultra-wideband phased array antenna reported at present does not exceed the high-frequency half wavelength generally.
The ultra-wideband wide-angle scanning electrical performance of the tightly-coupled phased array antenna under the large unit spacing is realized by adopting a differential design mode of a horizontal polarized dipole and a vertical polarized dipole to adapt to the scanning requirements of different azimuth planes and pitching planes and through a broadband impedance matching design of a feed balun, a coupling design between reinforced units with thickened tail ends of two arms of a radiator and a resonance elimination design of a grounding fork.
The tightly coupled phased array antenna is not loaded with any impedance matching layer increasing the section height, and the ultra-wideband wide-angle scanning electrical performance is realized by emphasizing the comprehensive optimization design of the dipoles and the feed balun. The section height is only 0.37 times of high-frequency wavelength, and the section height of the currently published ultra-wideband wide-angle scanning phased array antenna is usually larger than the half wavelength of the high frequency.
The tightly coupled phased array antenna is made of metal, the radiator and the feed balun are integrally machined, and the tightly coupled phased array antenna is firm and durable in structure, easy to assemble and maintain, large in power capacity and high in reliability.
Drawings
Fig. 1 is a schematic structural diagram of a foldable large-spacing ultra-wideband low-profile tightly-coupled array antenna provided in an embodiment of the present invention;
fig. 2 is a schematic top view of a foldable large-spacing ultra-wideband low-profile tightly-coupled array antenna provided in an embodiment of the present invention;
fig. 3 is a folding schematic diagram of a foldable large-spacing ultra-wideband low-profile tightly-coupled array antenna provided by an embodiment of the invention;
fig. 4 is a schematic structural diagram of a dipole antenna unit in a foldable large-spacing ultra-wideband low-profile tightly-coupled array antenna provided by an embodiment of the present invention;
fig. 5 is a schematic elevation view of a dipole antenna unit in a foldable large-spacing ultra-wideband low-profile tightly-coupled array antenna provided by an embodiment of the present invention;
fig. 6 is a schematic azimuth view of a dipole antenna unit in a foldable large-spacing ultra-wideband low-profile tightly-coupled array antenna provided by an embodiment of the invention (a vertically polarized dipole behind a horizontal dipole is hidden from view in the azimuth view).
Detailed Description
The technical solution of the present invention will be described in more detail with reference to the accompanying drawings, and the present invention includes, but is not limited to, the following embodiments.
As shown in fig. 1-3, the invention provides a foldable large-space ultra-wideband low-profile tightly-coupled array antenna, which comprises a reflector plate 4 and a plurality of dipole antenna units.
The reflecting plate 4 is formed by splicing a plurality of reflecting panels, adjacent reflecting panels are connected through a folding structure arranged on the lower surface, and the adjacent reflecting panels can be bent through the folding structure. The upper surface of the reflecting plate 4 is provided with dipole antenna units which are independent from each other and have no staggered structure. The folding structure is arranged at the edge of the dipole antenna unit, so that the array surface can be folded by 90 degrees (along the y-z plane) along the edge of the unit to the lower side in the non-working state, and the storage and the transportation of the antenna are facilitated.
The x-z plane is set as an azimuth plane, the y-z plane is set as a pitching plane, the unit distances of the antenna along the azimuth plane and the pitching plane are different, and the unit forms are not completely the same, so that the unit distances are increased as much as possible while the requirement of the coverage range of the differentiated wave beams in the orthogonal dimension is met, and the number of active channels of the phased array antenna is reduced.
As shown in fig. 4-6, the dipole antenna element includes a ground fork 3 and orthogonal vertically and horizontally polarized dipoles 1 and 2, the vertically and horizontally polarized dipoles 1 and 2 being in an "L" shaped positional relationship.
The grounding fork 3 is perpendicular to the reflecting plate 4 and is installed on the upper surface of the reflecting plate 4, the top of the grounding fork 3 is in a double-fork shape, the grounding fork 3 is arranged at the adjacent position of the vertical polarized dipole 1 and the horizontal polarized dipole 2, and the double-fork at the top of the grounding fork 3 is respectively positioned at the front side and the rear side of the horizontal polarized dipole 2. The vertically polarized dipole 1, the horizontally polarized dipole 2 and the ground fork 3 are not in physical contact with each other.
The vertically polarized dipole 1 and the horizontally polarized dipole 2 both comprise a feed balun 7 and a radiator 8, and the feed balun 7 and the radiator 8 are directly formed by machining of an integral structure.
The feed balun 7 is arranged at the bottom of the radiator 8, the structure is U-shaped, the bottom is connected with the reflecting plate 4, and the top is provided with an opening. A coaxial probe 10 similar to a gamma shape is embedded in the feed balun 7, an air cavity 11 matched with the coaxial probe 10 is arranged in the feed balun 7, the coaxial probe 10 is fixed in the air cavity 11 through a polytetrafluoroethylene dielectric block 13, the widths of the air cavities 11 on the two sides are different, and the longer end of the coaxial probe 10 is connected with a coaxial connector 12 arranged on the lower surface of the reflecting plate 4, so that impedance conversion between 50 ohms and the radiating body 8 is realized. The air cavity body 11 expands at some local positions and is used for installing the discrete polytetrafluoroethylene dielectric blocks 13 inside the air cavity body, the coaxial probe 10 is fixed by the polytetrafluoroethylene dielectric blocks 13, and the reliability of the structure is guaranteed while the electrical performance is basically not affected.
The radiator 8 is provided with a left arm and a right arm which are not directly connected and are respectively connected with the feed balun 7 through the bottom; triangular supports 9 are additionally arranged at the joints of the two arms of the feed balun 7 and the radiator 8 respectively to ensure structural stability.
The outer ends of the left arm and the right arm of a radiator 8 of the horizontal polarization dipole 2 are thickened, so that the capacitive coupling among horizontal polarization units is enhanced, the relatively insufficient low-frequency electrical property is optimized, and the bandwidth is expanded; the thickened part 5 at the tail end of the left arm and the thickened part 6 at the tail end of the right arm are of asymmetric structures, the thickened part 5 at the tail end of the left arm is surrounded by the grounding fork 3, and the asymmetric design can shift out the resonance point of low frequency to the outside of the working frequency band while considering the coupling degree between units. The antenna body is made of a metal structure in consideration of various factors such as power capacity, mechanical strength, and processing difficulty.
The invention is illustrated by way of example with a 7 x 7 array embodiment.
In this embodiment, the dipole antenna elements are arranged according to a rectangular grid period, and the orthogonally polarized dipole antennas in the same grid meet at the ends to form an "L" shaped positional relationship. The grids are independent from each other and have no staggered structure, so that the array surface can be folded along the edges of the grids in a non-working state, and the grids are convenient to store and transport.
As shown in fig. 3, the reflecting plates 4 at two rows of units at two side edges of the array can be folded along the pitching plane (y-z plane) by 90 degrees, so that the planar space occupied by the array is greatly reduced, the array structure is not damaged, and the array surface form has reducibility.
In this embodiment, the array scans + -50 deg. and + -25 deg. along the azimuth plane (x-z plane) and elevation plane (y-z plane), respectively, with a scan operating band of fl:3fl, and with forward radiation the operating band may cover fl:4 fl. In order to reduce the number of active channels of the phased array antenna and reduce the cost, under the condition of no scanning grating lobe (
θmMaximum scan angle) to maximize the cell pitch to near the theoretical limit. Specifically, for the case where the azimuth and pitch plane maximum scan angles are 50 ° and 25 °, respectively, in this example, the maximum theoretical cell pitches at which the azimuth and pitch planes do not have grating lobes are 0.566 λ and 0.7 λ, respectively. In this design example, the cell pitch of the array along the azimuth plane and along the elevation plane is 0.544 λ h-scan and 0.66 λ h-scan, respectively, very close to the theoretical limit, with reference to the highest frequency wavelength λ h-scan in the wavefront scan state; and with reference to the highest frequency wavelength lambdah in the forward radiation state of the wavefront, the cell spacing of the array along the azimuth plane and the pitch plane respectively reaches 0.725 lambdah and 0.88 lambdah, while the cell spacing of the tightly coupled phased array antenna in the prior art does not exceed 0.5 times of the high frequency wavelength generally.
The realization of the large unit spacing not only needs to predict the maximum unit spacing value without grating lobe through theoretical calculation, so that the design value does not exceed but is as close as possible to the predicted value, but also needs to overcome the increase of the antenna impedance matching difficulty caused by the large unit spacing. The vertically polarized dipole 1 and the horizontally polarized dipole 2 are designed independently here to achieve better impedance matching by adding design freedom, as shown in fig. 4-6. Although the unit spacing of the azimuth plane and the pitch plane is greatly different, the lengths of the vertically polarized dipole 1 and the horizontally polarized dipole 2 are relatively close to each other, namely 0.58 lambdoh-scan and 0.53 lambdoh-scan, and the size is favorable for realizing self-resonance of the dipoles at high frequency so as to achieve the effect of impedance matching. The antenna body is made of a metal structure in consideration of various factors such as power capacity, mechanical strength, and processing difficulty.
Each dipole antenna consists of a feed balun 7 and a radiator 8, the two parts are of an integral structure and are directly formed by machining; a triangular support 9 is added at the joint of the feed balun 7 and the radiator 8 so as to ensure structural stability. A coaxial probe 10 similar to a gamma shape is embedded in the feed balun 7, and an electric signal is transmitted to the radiator 8 in a coupling mode, so that ultra-wideband feed is realized. The left and right air cavities 11 of the feed balun 7 are of different widths to achieve an impedance transformation between the 50 ohm standard coaxial connector 12 and the radiator 8. For optimum performance, the feeding balun 7 parameters of the vertically and horizontally polarized dipoles 1 and 2 are also optimized separately and therefore are not identical. The feeding balun 7 of the vertically polarized dipole 1 and the horizontally polarized dipole 2 are respectively embedded into 4 polytetrafluoroethylene dielectric blocks 13 and 5 polytetrafluoroethylene dielectric blocks 13 to fix the coaxial probes 10, so that the reliability of the structure is ensured while the electrical property is basically not influenced.
Different from the vertically polarized dipole 1, the thickness of the tail end of the arm of the horizontally polarized dipole 2 is increased so as to strengthen the capacitive coupling among the horizontally polarized units, thereby optimizing the relatively insufficient low-frequency electrical property and expanding the bandwidth. When the unit spacing is larger than 0.5 time of high-frequency wavelength, common-mode resonance can occur in the unbalanced-fed dual-polarized dipole array, and in order to shift the resonance out of a high-frequency band, a grounding metal column can be added at the tail end of an orthogonal dipole to shorten the resonance length. However, this design also shortens the path of another low frequency resonance, the loop resonance, and may introduce the loop resonance into the low frequency band, especially for horizontally polarized antennas with shorter resonant loops. In order to shift out the low frequency resonance, the end of the left arm of the horizontally polarized dipole 2 is only left at the upper half part, and the grounding metal column is designed to surround the end of the left arm of the horizontally polarized dipole 2 in the form of a grounding fork 3 so as to increase the length of the resonance path and simultaneously take the coupling degree between units into consideration. The offset design of the ground fork 3 in the azimuth plane is also one of the important factors that the wavefront can achieve folding.
By means of the design and parameter optimization simulation, the tightly coupled phased array antenna in the embodiment can scan to 50 degrees and 25 degrees along the azimuth plane and the elevation plane respectively at the maximum within the frequency tripling bandwidth (fl:3fl), and the active standing wave is kept below 3 degrees. The operating bandwidth of the tightly coupled phased array antenna can cover four octaves (fl:4fl) when radiating in the forward direction, and the active standing waves of the horizontal port and the vertical port are respectively below 2.5 and 2. The orthogonal port isolation of the tightly coupled phased array antenna during scanning along the azimuth plane and the elevation plane is respectively kept below-40 dB and-20 dB in a scanning working frequency band (fl:3fl), and the working requirement can be met. When the tightly coupled phased array antenna excites the horizontal port and the vertical port respectively, the unit forward radiation gain is basically consistent with the ideal aperture gain (4 pi A/lambda 2, A is aperture area), and the maximum difference is not more than 1dB, which shows that the antenna has good radiation efficiency and higher radiation gain.
By means of the design and parameter optimization simulation, the section height of the tightly coupled phased array antenna is only 0.37 lambdoh-scan and is about 1/2 and 2/3 of the pitch plane and azimuth plane cell spacing while the ultra-wide-band wide-angle scanning electrical performance is realized, and the section height of the ultra-wide-angle scanning phased array antenna in the prior art is usually larger than or close to the cell spacing and larger than or close to a high-frequency half wavelength.
The present invention is not limited to the above embodiments, and those skilled in the art can implement the present invention in other various embodiments according to the disclosure of the embodiments and the drawings, and therefore, all designs that can be easily changed or modified by using the design structure and thought of the present invention fall within the protection scope of the present invention.
Claims (10)
1. The foldable large-space ultra-wideband low-profile tightly-coupled array antenna is characterized by comprising a reflecting plate (4) and a plurality of dipole antenna units;
the upper surface of the reflecting plate (4) is provided with the dipole antenna unit, the dipole antenna unit comprises a grounding fork (3) and a vertical polarization dipole (1) and a horizontal polarization dipole (2) which are orthogonal to each other, and the vertical polarization dipole (1) and the horizontal polarization dipole (2) are in an L-shaped position relation;
the vertically polarized dipole (1) and the horizontally polarized dipole (2) both comprise a feed balun (7) and a radiator (8);
the feed balun (7) is arranged at the bottom of the radiating body (8), the bottom of the feed balun (7) is connected with the reflecting plate (4), and an opening is formed in the top of the feed balun;
a coaxial probe (10) similar to a gamma shape is embedded in the feeding balun (7), and the longer end of the coaxial probe (10) is connected with a coaxial connector (12) arranged on the lower surface of the reflecting plate (4);
the radiator (8) is provided with a left arm and a right arm which are not directly connected and are respectively connected with the feed balun (7) through the bottom.
2. The foldable large-spacing ultra-wideband low-profile tightly-coupled array antenna as claimed in claim 1, wherein the dipole antenna elements are independent from each other and have no staggered structure, so that the reflector plate (4) can be provided with a folding structure at the edges of the dipole antenna elements and can be folded.
3. The foldable large-spacing ultra-wideband low-profile tightly-coupled array antenna as claimed in claim 1, wherein an air cavity (11) matched with the coaxial probe (10) is arranged in the feeding balun (7), and the widths of two sides of the air cavity (11) are different.
4. The foldable large-spacing ultra-wideband low-profile tightly-coupled array antenna as claimed in claim 3, wherein the air cavity (11) is provided with a plurality of expansion positions, the expansion positions are provided with polytetrafluoroethylene dielectric blocks (13), and the polytetrafluoroethylene dielectric blocks (13) fix the coaxial probes (10).
5. The foldable large-spacing ultra-wideband low-profile tightly-coupled array antenna as claimed in claim 1, wherein the outer ends of the left and right arms of the radiator (8) of the horizontally-polarized dipole (2) are thickened for enhancing the capacitive coupling between the horizontally-polarized units, optimizing the relatively insufficient low-frequency electrical performance and expanding the bandwidth.
6. The foldable large-spacing ultra-wideband low-profile tightly-coupled array antenna according to claim 5, wherein the left and right arms of the radiator (8) of the horizontally-polarized dipole (2) are asymmetric, and only the upper half of the end of the left arm of the radiator (8) of the horizontally-polarized dipole (2) is remained.
7. The foldable large-spacing ultra-wideband low-profile tightly-coupled array antenna according to claim 6, wherein the grounding fork (3) is vertically arranged on the upper surface of the reflector plate (4), and the left arm end of the radiator (8) of the horizontally-polarized dipole (2) is surrounded by the grounding fork (3) for increasing the resonant path length while taking the coupling degree between the units into consideration.
8. The foldable large-spacing ultra-wideband low-profile tightly-coupled array antenna as claimed in claim 1, wherein triangular supports (9) are respectively added at the joints of the feed balun (7) and the two arms of the radiator (8) to ensure structural stability.
9. The foldable large-spacing ultra-wideband low-profile tightly-coupled array antenna as claimed in claim 1, wherein the cell spacing of each dipole antenna element along the azimuth plane and along the elevation plane is 0.544 λ h-scan and 0.66 λ h-scan respectively, and the λ h-scan represents the highest-frequency wavelength in the wavefront scanning state.
10. The foldable large-spacing ultra-wideband low-profile tightly-coupled array antenna as claimed in claim 1, wherein the profile height of each dipole antenna element is 0.37 λ h-scan; the λ h-scan represents the highest frequency wavelength in the wavefront scan state.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114267942A (en) * | 2021-12-24 | 2022-04-01 | 中国电子科技集团公司第十四研究所 | Foldable large-space ultra-wideband low-profile tightly-coupled array antenna |
| CN114883785A (en) * | 2022-04-22 | 2022-08-09 | 中国电子科技集团公司第十四研究所 | Thin dual-polarization ultra-wideband wide-angle scanning array antenna |
| CN115296047A (en) * | 2022-10-08 | 2022-11-04 | 南京天朗防务科技有限公司 | Tightly-coupled circularly-polarized common-caliber antenna |
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| CN107086369A (en) * | 2017-04-27 | 2017-08-22 | 电子科技大学 | A kind of low RCS Scanning Phased Array Antenna with Broadband based on strong mutual coupling effect |
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| CN115296047B (en) * | 2022-10-08 | 2022-12-27 | 南京天朗防务科技有限公司 | Tightly coupled circularly polarized common-caliber antenna |
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