CN107093794B - For generating the array antenna of bimodal vortex electromagnetic field - Google Patents
For generating the array antenna of bimodal vortex electromagnetic field Download PDFInfo
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- CN107093794B CN107093794B CN201710299588.9A CN201710299588A CN107093794B CN 107093794 B CN107093794 B CN 107093794B CN 201710299588 A CN201710299588 A CN 201710299588A CN 107093794 B CN107093794 B CN 107093794B
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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
- H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/0006—Particular feeding systems
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/29—Combinations of different interacting antenna units for giving a desired directional characteristic
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Abstract
The invention discloses a kind of for generating the array antenna of bimodal vortex electromagnetic field, and mainly solution prior art generation vortex electromagnetic field mode is single, the low problem of array bore utilization rate.It includes 8 array elements (T), feeding network (K), medium substrate (J), coaxial probe (D) and metal floor (G), 8 array elements (T) and feeding network (K) are printed on the upper surface of medium substrate (J), and metal floor (G) is printed on the lower surface of medium substrate (J)；Feeding network (K) is equipped with an input port and 8 output ports, the input terminal are connect with coaxial probe (D), to realize coaxial probe (D) to the feed of feeding network (K)；8 output ports are successively correspondingly connected with 8 array elements (T), to realize feeding network (K) to the feed of array element (T).The present invention can generate the vortex electromagnetic wave of both modalities which, can be used for wireless communication system front end.
Description
Technical field
The invention belongs to antenna technical fields, and in particular to a kind of for generating the array day of bimodal vortex electromagnetic field
Line can be used for wireless communication system, satellite communication system and radar detection.
Background technique
Vortex electromagnetic wave is a kind of electromagnetic wave for being different from common plane wave, and plane wave only has spin angular momentaum, and is vortexed
Electromagnetic wave not only has spin angular momentaum, there are also orbital angular momentum, its equiphase surface since wave beam carries orbital angular momentum and
It is spirally distributed, is different with the equiphase plane of plane wave.Vortex electromagnetic wave can have different mode number l, no
Same l represents different degree of swirl, theoretically speaking l has unlimited number of value, and is mutually orthogonal between different modalities
's.This characteristic provides an ideal developing direction to improve the availability of frequency spectrum and channel capacity.
By the tracking to domestic and international present Research as can be seen, domestic and foreign scholars propose some generation vortex electromagnetism at present
The method of field, such as document " Q.Bai, A.Tennant and B.Allen.Experimental circular phased
array for generating OAM radio beams[J].Electronics Letters,25th September
Single mode vortex electromagnetic field is generated based on micro-strip array antenna disclosed in 2014, Vol.50No.20:pp.1414-1415. "
8 array elements are spacedly distributed on concentric circles by method, each array element successively with each output port phase of feeding network
Connection, the circular array antenna of composition, to generate the vortex electromagnetic field of single mode.Although the array antenna of this method composition
Gain is higher, and section is low, is easy to conformal, but the array antenna can only generate the vortex electromagnetic field of single mode, can not be simultaneously
Multiple mode are multiplexed, array aperture utilization rate is lower.
Summary of the invention
It is a kind of for generating bimodal vortex electromagnetism it is an object of the invention in view of the above shortcomings of the prior art, propose
The array antenna of field improves the bore utilization rate of array antenna to increase the mode quantity for generating vortex electromagnetic field.
To achieve the above object, the present invention is used to generate the array antenna of bimodal vortex electromagnetic field, including 8 array lists
Member, feeding network, medium substrate, coaxial probe and metal floor, 8 array elements and feeding network are printed on medium substrate
Upper surface, metal floor is printed on the lower surface of medium substrate, it is characterised in that:
Each array element is H-shaped patch, and the end surface of each H-shaped patch is provided with U-lag, so that each array list
Member work is in the two frequency points of 0.9GHz and 1.8GHz；
Two groups of double minor matters impedance matching boxs are equipped in feeding network, so that feeding network work is in 0.9GHz and 1.8GHz；
8 differences mutually feed minor matters are additionally provided in feeding network, to realize that difference is mutually fed between each adjacent array element, i.e.,
In the frequency point of 0.9GHz, mutually feed minor matters successively realize 45 ° of the phase phase difference between each adjacent array element to this 8 differences, In
The frequency point of 1.8GHz, mutually feed minor matters successively realize 90 ° of the phase phase difference between each adjacent array element to this 8 differences.
Above-mentioned array antenna, it is characterised in that: feeding network is equipped with an input port and 8 output ports, the input
End is connect with coaxial probe, to realize coaxial probe to the feed of feeding network；8 output ports successively with 8 array lists
Member is correspondingly connected with, to realize feeding network to the feed of array element.
Above-mentioned array antenna, it is characterised in that: two groups of double minor matters impedance matching boxs are the cascade stairstepping impedance of 2 sections
Orchestration, each length that saves is λ0.9/ 6, wherein λ0.9For the corresponding operation wavelength of 0.9GHz.
Above-mentioned array antenna, it is characterised in that: two groups of double minor matters impedance matching boxs are left above and below coaxial probe position
It is right symmetrical.
Above-mentioned array antenna, it is characterised in that: First Transition minor matters and the second transition minor matters are in coaxial probe position
Up and down, bilateral symmetry.
Above-mentioned array antenna, it is characterised in that: it is characterized in that mutually feed minor matters are that the micro-strip of serpentine configuration passes to 8 differences
Defeated line, wherein mutually feed minor matters and the 5th poor mutually feed minor matters, the second difference mutually feed minor matters and the 6th difference mutually feed branch to the first difference
Section, third difference mutually feed minor matters with the 7th difference mutually feed minor matters, the 4th difference mutually feed minor matters with the 8th difference phase feed minor matters this four
It is symmetrical above and below in coaxial probe position to poor mutually feed minor matters.
Above-mentioned array antenna, it is characterised in that: the turning that each difference mutually feeds minor matters is externally provided with the tangent line that beveling rate is p,
The tangent line on the outside of turning at a distance from be L1, and the angle between tangent line and feeder line bottom edge is 45 °, on the inside of turning and on the outside of turning
The distance between be L2, beveling rate p=L1/L2。
Above-mentioned array antenna, it is characterised in that: first group of double minor matters impedance matching box is equipped with 2, and First Transition minor matters are set
There are 2, the second transition minor matters are equipped with 4, and second group of double minor matters impedance matching box is equipped with 4, every 2 transition minor matters, 4 connection group
In a pair.
Above-mentioned array antenna, it is characterised in that: the double minor matters impedance matching boxs of 2 of described first group, each of which first
Minor matters are correspondingly connected with each First Transition minor matters, each of which second minor matters is correspondingly connected with each pair of second transition minor matters, i.e., and 2
Second minor matters are correspondingly connected with two pairs of transition minor matters respectively；Each of described second group double minor matters impedance matching box, each of which
One minor matters are correspondingly connected with each second transition minor matters, and mutually feed minor matters are correspondingly connected with each of which second minor matters with each pair of difference, i.e., and 4
Mutually feed minor matters are correspondingly connected with a second minor matters with four pairs of differences respectively.
Above-mentioned array antenna, it is characterised in that: the size of 8 array elements is identical, and is equally spaced
It is on R circumference in radius, wherein R value is the corresponding wavelength of 1.8GHz.
Compared with prior art, the present invention has the advantage that
1. the present invention can generate bimodulus vortex electromagnetic field, it can be achieved that a variety of of vortex electromagnetic field under same an array bore
Mode is multiplexed, and the bore utilization rate of array antenna is improved.
2. the present invention can work in the two frequency points of 0.9GHz and 1.8GHz, operational frequency bandwidth is increased.
3. the present invention, as antenna array unit, is effectively reduced array cell sizes, makes to form using H-type microstrip antenna
Array antenna structure it is more compact.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the embodiment of the present invention；
Fig. 2 is the return loss plot figure of the embodiment of the present invention；
Fig. 3 is the far field radiation pattern that the embodiment of the present invention is 1 in the vortex electromagnetic beam mode value of 0.9GHz；
Fig. 4 is the far field radiation pattern that the embodiment of the present invention is 2 in the vortex electromagnetic beam mode value of 1.8GHz；
Fig. 5 is the near field distribution map of the electric field that the embodiment of the present invention is 1 in the vortex electromagnetic beam mode value of 0.9GHz；
Fig. 6 is the near field distribution map of the electric field that the embodiment of the present invention is 2 in the vortex electromagnetic beam mode value of 1.8GHz.
Specific embodiment
The embodiment of the present invention is described in further detail with reference to the accompanying drawing:
Referring to Fig.1, the present invention is mainly by 8 array element T, feeding network K, medium substrate J, coaxial probe D and metal
Floor G composition, 8 array element T, feeding network K are printed on the upper surface of medium substrate J, and metal floor G is printed on medium
The lower surface of substrate J, coaxial probe D sequentially pass through metal floor G and medium substrate J, and the input port phase with feeding network K
Connection, in which:
The metal floor G uses copper sheet.
The medium substrate J, using epoxy resin, the dielectric constant of such material is 4.2, medium substrate J with a thickness of
5mm, length and width are 500mm.
The array element T is all made of H-shaped patch, the long L of each unit0=70mm, wide W0=74mm；In each unit
The center of two sides is provided with the first rectangular channel, the second rectangular channel is provided in the center on each unit bottom edge, in each list
One end of member is provided with U-type groove.
The feeding network K, including first group of double 2,3, second groups of minor matters impedance matching box double minor matters impedance matching box 5,
6, First Transition minor matters 1, the second transition minor matters 4 and 8 difference mutually feed minor matters 7,8,9,10,11,12,13,14, wherein poor phase
It feeds minor matters 7,8 and constitutes first pair of difference mutually feed minor matters, mutually feed minor matters 9,10 constitute second pair of difference mutually feed minor matters, poor phase to difference
It feeds minor matters 11,12 and constitutes third to poor mutually feed minor matters, mutually feed minor matters 13,14 constitute the 4th pair of difference mutually feed minor matters to difference；
First group of double minor matters impedance matching box 2,3 is equipped with 2, and second group of double minor matters impedance matching box 5,6 is equipped with 4, First Transition branch
Section 1 is equipped with 2, and the second transition minor matters 4 are equipped with 4, and every 2 the second transition minor matters 4 connection partners；
It is cascade that this first group double 2,3 and the second groups of minor matters impedance matching box double minor matters impedance matching boxs 5,6 are all made of 2 sections
Stairstepping impedance matching box, and first group of double 2,3 and the second groups of minor matters impedance matching box double minor matters impedance matching box 5,6 is in coaxial
Above and below the position probe D, bilateral symmetry；The First Transition minor matters 1 and the second transition minor matters 4 adopt the micro-strip for rectangular configuration
Transmission line, and First Transition minor matters 1 and the second transition minor matters 4 are above and below the position coaxial probe D, bilateral symmetry；8 differences
Mutually feed minor matters 7,8,9,10,11,12,13,14 are the microstrip transmission line of serpentine configuration, wherein the first difference mutually feeds minor matters 7
Mutually feed minor matters 11, the second poor phase feed minor matters 8 mutually feed minor matters 12, the poor mutually feed minor matters 9 of third with the 6th difference with the 5th difference
Mutually feed minor matters 13, the 4th poor mutually feed minor matters 10 mutually feed this four pairs differences of minor matters 14 mutually feed minor matters with the 8th difference with the 7th difference
It is symmetrical above and below in the position coaxial probe D；The turning that each difference mutually feeds minor matters is externally provided with the tangent line that beveling rate is p,
In, tangent line on the outside of turning at a distance from be L1And the angle between feeder line bottom edge is 45 °, on the inside of turning between the outside of turning
Distance be L2, beveling rate p=L1/L2.The connection relationship of these components is as follows:
First group of double minor matters impedance matching box 2,3, each of which first minor matters 2 is correspondingly connected with each First Transition minor matters 1,
Each of which second minor matters 3 is correspondingly connected with each pair of second transition minor matters 4, i.e. 2 the second minor matters 3 respectively with two pair of second transition branch
Section 4 is correspondingly connected with；
Second group of double minor matters impedance matching box 5,6, each of which first minor matters 5 is correspondingly connected with each second transition minor matters 4,
Mutually feed minor matters are correspondingly connected with each of which second minor matters 6 with each pair of difference, i.e., mutually feed minor matters are one end connection compositions one to two differences
To poor mutually feed minor matters, and connect in junction with the center of 6 end of the second minor matters, with realize each second minor matters 6 and
Each pair of poor mutually feed minor matters are correspondingly connected with, and then are obtained 4 the second minor matters 6 and mutually fed minor matters 7,8, second with first pair of difference respectively
To poor mutually feed minor matters 9,10, third, to 11,12, the 4th pairs of differences of poor mutually feed minor matters, mutually feed minor matters 13,14 are correspondingly connected with；
To guarantee that the output impedance of 8 output ports and the input impedance of array element T of feeding network K match, need
By each of feeding network K difference, mutually feed minor matters are deep into respectively inside the second rectangular channel of each array element T, and with second
The connection of rectangular channel top margin center；8 array element T are successively correspondingly connected with 8 output ports of feeding network K, 8 battle arrays
Column unit T equidistantly distributed is on the circumference of radius R=166mm.
Double minor matters impedance matching box parameters, the ginseng of transition minor matters of slot parameter, feeding network K that above-mentioned H-shaped patch opens up
Number, and difference mutually feed the beveling rate of minor matters and the width of output port, optimize setting, this reality all in accordance with microstrip antenna theory
Example is applied to use but be not limited to take following parameter:
First rectangle slot length d=35mm, width s=10.5mm；Second rectangle slot length Lm=31.5mm, width Wm=
6.85mm；U-type groove length Ls=16mm, width Ws=3mm, wherein U-type groove is away from cell edges distance df=1mm；Feeding network K
8 port widths be Wf=4.85mm；
The width of two groups of double minor matters impedance matching boxs 2,3 is respectively 6mm and 12.6mm, length be respectively 40.3mm and
13mm；The width of transition minor matters 1 and 4 is 9mm, and length is respectively 10mm and 17mm；8 difference phase feed minor matters 7,8,9,
10,11,12,13,14 beveling rate is respectively p1=0.92, p2=0.95, p3=0.85, p4=0.85, p5=0.92, p6=
0.95, p7=0.85, p8=0.85.
In the present embodiment, 8 array element T constant amplitude differences are mutually fed by feeding network K, between adjacent array element T
Phase difference isWherein N=8, l are the mode value of vortex electromagnetic beam, and need to meet 0 < l < N/2.Pass through
The length that difference mutually feeds minor matters 7,8,9,10,11,12,13,14 is adjusted, to realize reasonable phase between adjacent array element T
Potential difference
In 0.9GHz, the length that 4 differences of array antenna top half mutually feed minor matters 7,8,9,10 successively increases λ0.9/
8, wherein λ0.9For the corresponding operation wavelength of 0.9GHz, to realize that this 4 differences mutually feed the output phases of minor matters 7,8,9,10
Difference is 45 °；Due to array antenna top half and its lower half portion about the position coaxial probe D symmetrical, array day
The difference of line lower half portion 4 mutually feeds the phase difference output of minor matters 11,12,13,14, with 4 difference phase feed minor matters of its top half
7,8,9,10 phase difference output is identical, i.e. the output of the 4 of array antenna lower half portion difference phase feed minor matters 11,12,13,14
Phase difference is also 45 °；According to image theory, the 5th difference mutually feeds the output phase and first difference phase feed minor matters of minor matters 11
7 output phase difference is 180 °, and the output phase of the 6th poor mutually feed minor matters 12 mutually feeds the defeated of minor matters 8 with second difference
Phase phase difference is 180 ° out, and the 7th difference mutually feeds the output phase and the poor output phase for mutually feeding minor matters 9 of third of minor matters 13
Phase difference is 180 °, and the 8th difference mutually feeds the output phase and the 4th poor output phase phase for mutually feeding minor matters 10 of minor matters 14
Difference is 180 °.
To sum up, realize that 8 poor phase difference outputs for mutually feeding minor matters 7,8,9,10,11,12,13,14 are
Since mutually feed minor matters 7,8,9,10,11,12,13,14 are connect with 8 array element T-phase 8 differences respectively, finally in 0.9GHz
Realize the phase difference between adjacent array element T
According to microstrip transmission line theory, when array antenna working frequency becomes 1.8GHz from 0.9GHz, this 8 differences are mutually presented
Phase difference variable between electric minor matters 7,8,9,10,11,12,13,14 is 90 °, it is final realize 1.8GHz adjacent array element T it
Between phase difference
Phase difference in the present embodiment, between 0.9GHz, adjacent array element TMode value l can be obtained
=1 vortex electromagnetic beam；Phase difference between 1.8GHz, each array element TMode value l=2 can be obtained
Vortex electromagnetic beam.
The effect of the present embodiment can be further illustrated by following emulation:
One, simulated conditions: above-mentioned array antenna model is emulated using electromagnetic simulation software HFSS15.0.
Two, emulation contents:
Emulation 1, emulates the return loss of the embodiment of the present invention, and simulation result is as shown in Fig. 2, returning by Fig. 2
Wave damage curve figure is as it can be seen that the return loss of array antenna of the invention in 0.9GHz and 1.8GHz is respectively less than -25dB, array day
The working condition of line is good.
Emulation 2, the far field radiation pattern to the embodiment of the present invention in 0.9GHz emulates, simulation result such as Fig. 3
Shown, it is recessed to form energy right above array antenna for far field radiation pattern it can be seen from the far field radiation pattern of Fig. 3
It falls into, this meets the characteristic of vortex electromagnetic wave.
Emulation 3, the far field radiation pattern to the embodiment of the present invention in 1.8GHz emulates, simulation result such as Fig. 4
Shown, it is recessed to form energy right above array antenna for far field radiation pattern it can be seen from the far field radiation pattern of Fig. 4
It falls into, meets the characteristic of vortex electromagnetic wave.
Emulation 4, the near field distribution map of the electric field to the embodiment of the present invention in 0.9GHz emulates, simulation result such as Fig. 5
Shown, it can be seen from the near field distribution map of the electric field of Fig. 5 when vortex electromagnetic field mode state value is 1, near field field distribution is 2
The orbital curve rotated clockwise.
Emulation 5, the near field distribution map of the electric field to the embodiment of the present invention in 1.8GHz emulates, simulation result such as Fig. 6
Shown, it can be seen from the near field distribution map of the electric field of Fig. 6 when vortex electromagnetic field mode state value is 2, near field field distribution is 4
The orbital curve rotated clockwise.
By emulation 4 with emulation 5 as it can be seen that near field field distribution is a plurality of clockwise orbital curve, this and different modalities value
Orbital angular momentum beam feature it is consistent, show that array antenna of the invention can produce the good electromagnetism of vortex electromagnetic characteristics
Wave.
Claims (8)
1. a kind of for generating the array antenna of bimodal vortex electromagnetic field, including 8 array elements (T), feeding network (K),
Medium substrate (J), coaxial probe (D) and metal floor (G), 8 array elements (T) and feeding network (K) are printed on medium
The upper surface of substrate (J), metal floor (G) are printed on the lower surface of medium substrate (J), it is characterised in that:
Each array element (T) is H-shaped patch, the first rectangular channel is provided in the center of each unit two sides, each
The center on unit bottom edge is provided with the second rectangular channel, is provided with U-type groove in one end of each unit, so that each array element work
Make in the two frequency points of 0.9GHz and 1.8GHz；
It is equipped with two groups of double minor matters impedance matching boxs in feeding network (K), respectively first group double minor matters impedance matching box (2,3),
With second group of double minor matters impedance matching box (5,6) so that feeding network work is in 0.9GHz and 1.8GHz；
8 differences mutually feed minor matters (7,8,9,10,11,12,13,14) is additionally provided in feeding network (K), in each adjacent array list
Realize that difference is mutually fed between first (T), the turning of each difference mutually feed minor matters is externally provided with the tangent line that beveling rate is p, the tangent line with turn
Distance on the outside of angle is L1, and the angle between tangent line and feeder line bottom edge is 45 °, on the inside of turning and the distance between on the outside of turning
For L2, beveling rate p=L1/L2, i.e., in the frequency point of 0.9GHz, mutually feed minor matters successively realize each adjacent array element to this 8 differences
(T) 45 ° of the phase phase difference between, in the frequency point of 1.8GHz, mutually feed minor matters successively realize each adjacent array element to this 8 differences
(T) 90 ° of the phase phase difference between；8 differences mutually feed the micro-strip that minor matters (7,8,9,10,11,12,13,14) are serpentine configuration
Transmission line.
2. array antenna according to claim 1, it is characterised in that: feeding network (K) is equipped with an input port and 8
Output port, the input terminal are connect with coaxial probe (D), to realize coaxial probe (D) to the feed of feeding network (K)；This 8
Output port is successively correspondingly connected with 8 array elements (T), to realize feeding network (K) to the feed of array element (T).
3. array antenna according to claim 1, it is characterised in that: two groups of double minor matters impedance matching boxs are 2 assistant wardens connection
Stairstepping impedance matching box, each length that saves is λ0.9/ 6, wherein λ0.9For the corresponding operation wavelength of 0.9GHz.
4. array antenna according to claim 1, it is characterised in that: two groups of double minor matters impedance matching boxs are in coaxial probe
(D) above and below position, bilateral symmetry.
5. array antenna according to claim 1, it is characterised in that: First Transition minor matters (1) and the second transition minor matters (4)
Above and below the position coaxial probe (D), bilateral symmetry.
6. array antenna according to claim 1, it is characterised in that: first group of double minor matters impedance matching box (2,3) is equipped with 2
A, First Transition minor matters (1) are equipped with 2, and the second transition minor matters (4) are equipped with 4, second group of double minor matters impedance matching box (5,6)
Equipped with 4, every 2 transition minor matters (4) connection partners.
7. array antenna according to claim 6, it is characterised in that:
The double minor matters impedance matching boxs (2,3) of 2 of described first group, the first minor matters (2) of each of which and each First Transition branch
Section (1) is correspondingly connected with, each of which second minor matters (3) is correspondingly connected with each pair of second transition minor matters (4), i.e. 2 the second minor matters (3)
It is correspondingly connected with respectively with two pairs of transition minor matters (4)；
Each of described second group double minor matters impedance matching box (5,6), each of which first minor matters (5) and each second transition minor matters
(4) it is correspondingly connected with, mutually feed minor matters are correspondingly connected with each of which second minor matters (6) with each pair of difference, i.e. 4 the second minor matters (6) are respectively
With first pair of difference mutually feed minor matters (7,8), second pair of difference mutually feed minor matters (9,10), third to poor mutually feed minor matters (11,12),
Mutually mutually feed minor matters are correspondingly connected with this four pairs differences of feed minor matters (13,14) 4th pair of difference.
8. array antenna according to claim 1, it is characterised in that: the complete phase of size of 8 array elements (T)
Together, it and is equally spaced in radius as on R circumference, wherein R value is the corresponding wavelength of 1.8GHz.
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| CN107831597A (en) * | 2017-09-18 | 2018-03-23 | 华南理工大学 | A kind of new generation bimodulus optical eddy light beam circular polarised array antenna |
| CN107887703B (en) * | 2017-11-01 | 2020-11-10 | 山西大学 | Dual-band vortex electromagnetic wave array antenna |
| CN108199135B (en) * | 2018-01-11 | 2019-12-03 | 中南大学 | OAM radio wave generation device |
| CN108321530B (en) * | 2018-01-23 | 2020-12-04 | 中南大学 | OAM radio wave generation device based on single dielectric resonator |
| CN108767474B (en) * | 2018-06-04 | 2020-12-18 | 中南大学 | Novel OAM wave beam generation device |
| CN111864376A (en) * | 2020-07-06 | 2020-10-30 | 中国联合网络通信集团有限公司 | Terahertz antenna |
| CN113608191B (en) * | 2021-07-30 | 2024-01-02 | 上海无线电设备研究所 | Near-field target azimuth recognition method |
| CN114914669B (en) * | 2022-05-30 | 2023-08-04 | 中国人民解放军战略支援部队航天工程大学 | Broadband plane vortex wave antenna with multiple modes |
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