CN105870637A - Radial line dielectric resonant antenna array - Google Patents
Radial line dielectric resonant antenna array Download PDFInfo
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- CN105870637A CN105870637A CN201610428129.1A CN201610428129A CN105870637A CN 105870637 A CN105870637 A CN 105870637A CN 201610428129 A CN201610428129 A CN 201610428129A CN 105870637 A CN105870637 A CN 105870637A
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- gap
- radial line
- antenna array
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- waveguide
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q13/00—Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave
- H01Q13/10—Resonant slot antennas
-
- 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
- H01Q21/00—Antenna arrays or systems
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/24—Combinations of antenna units polarised in different directions for transmitting or receiving circularly and elliptically polarised waves or waves linearly polarised in any direction
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- Waveguide Aerials (AREA)
Abstract
The invention discloses a radial line dielectric resonant antenna array. The radial line dielectric resonant antenna array comprises a radial line seam waveguide, a dielectric resonant antenna array, a feeding part and a dielectric layer, wherein the radial line seam waveguide comprises a metal plate, a metal bottom plate and a metal side wall; the dielectric layer is in the shape of a hollow cylinder, and fills the inside of the radial line seam waveguide; a hollow part is corresponding to a lug boss of the metal bottom plate; the dielectric resonant antenna array comprises a plurality of dielectric resonant antenna units which are positioned right above a seam in the upper surface of the metal plate; a feeding probe part comprises four metal rods and four SMA antenna joints, wherein each metal rod is connected with one SMA antenna joint to form a feeding probe. The radial line dielectric resonant antenna array provided by the invention adopts a four-feed-point feeding mode to radiate circular polarization electromagnetic waves, so that high gain and relatively high aperture efficiency are realized.
Description
Technical field
The present invention relates to a kind of RADIAL waveguide medium resonant antenna array, exactly, relate to one and can be used for wireless
The RADIAL waveguide medium resonant antenna array of four feed point of communication, belongs to the technical field of communication antenna array.
Background technology
The resonant antenna that dielectric resonator antenna is made up of low-loss microwave dielectric material, its resonant frequency is by resonator
Size, shape and relative dielectric constant determine.Medium resonator antenna has a good performance, of great interest and
Research.The dielectric constant selectable range of dielectric resonator antenna is big, and size and bandwidth can control flexibly, various shapes, damages
Consuming little, radiation efficiency is the highest.Processing technology is simple, and cost is relatively low, just with integrated.Medium resonator antenna is widely used to indigo plant
The communication system such as tooth, WLAN, and have potential using value in a lot of fields, as radar system, mobile-satellite lead to
Letter, phased array antenna etc..
At present, dielectric resonator antenna is mainly by probe, and substrate integration wave-guide, the mode such as microstrip line feeds.Use probe
Feeding classification, each array element is required for a probe and feeds.Feeding substrate integrated waveguide applies in general to high frequency work
Make scope.Using feed microstrip line loss compared with big and time unit number is many, feeding network is complicated.
The most conventional radio communication high-gain aerial has electromagnetic horn, micro-strip antenna array, reflective array antenna and radial direction
Wire antenna, wherein electromagnetic horn and reflective array antenna are three-dimensional antenna, and size is very big, and micro-strip antenna array frequency band is narrow, has conductor
And dielectric loss, surface wave can be encouraged, caused radiation efficiency to reduce.Radial line slot antenna is by adjusting the seam of antenna surface
Gap is arranged, it is thus achieved that high-gain, and feeds other kinds of antenna with the spread pattern of its uniqueness, promotes the mouth of antenna
Footpath efficiency and radiation efficiency.
Summary of the invention
The invention aims to solve the problems referred to above, propose the circular polarisation of a kind of high-gain being applicable to radio communication
RADIAL dielectric resonator antenna array, this antenna also has the following characteristics that cost is low, planar structure, aperture efficiency high.
The circular polarisation RADIAL dielectric resonator antenna array of the present invention, including radial line slot waveguide, the feedback of circle arrangement
Electric probe part, dielectric resonator antenna array.
Radial line slot waveguide includes that layer gap uses the metallic plate of circle arrangement, lower metal ground and metal ring
Sidewall.Radial line slot waveguide is cylindrical structural, and upper surface cracks, and center, lower metal ground borehole, duct height is less than two
/ mono-waveguide wavelength.Feed probes part includes four metal bars and four the antenna sub-miniature A connectors being connected with metal bar, four
Feed probes is positioned at the position of distance axle center same radius length, and four antenna terminal one end are stretched out outside radial line slot waveguide
Portion, the other end connects metal bar, is goed deep into inside waveguide by metal ground central through hole.Dielectric resonator antenna array includes multiple Jie
Matter resonant element, it is positioned at the surface of upper strata slit metal.Four feed probes are humorous to medium by radial line slot waveguide
The aerial array that shakes feeds.
The gap of described radial line slot waveguide upper strata metallic plate is orthogonal, occurs in pairs and with in donut mode
Arrangement.
The gap of described radial line slot waveguide upper strata metallic plate occurs in pairs, and the length in gap pair, position, the number of turns are permissible
Being adjusted, for each circle, the inclination angle on long limit, gap keeps constant.
The arrangement mode of described dielectric resonator antenna array is identical with the arrangement mode of upper strata slit metal surface gaps.
Described four feed probes position away from axle center can be adjusted, and probe height can be adjusted, four feedbacks
The electric probe distance away from axle center to keep consistent, and probe height also to keep consistent, makes excitation amplitude identical, and angle differs successively
90°。
Described four feed probes angles differ 90 ° the most successively and can produce left-handed or right-handed circular polarization
Ripple.
Described radial line slot waveguide also includes middle dielectric layer, and dielectric layer is by the low-k of columned hollow
Dielectric material is constituted, and thickness is less than 1/2nd Medium Wave Guide wavelength, be filled in layer gap by the metallic plate of circle arrangement and
Between lower metal ground.
The radius of the central through hole of described central dielectric layer can be adjusted.
Described upper layer gap can pass through stickum by the metallic plate of circle arrangement, lower metal ground and middle dielectric layer
It is bonded together, it is also possible to be fixed together by punching plastics screw.
The metal sidewall of described upper strata slit metal outermost clearance distance radial line slot waveguide is quarter-wave
Guide wavelength.
The shape of described dielectric resonator antenna can be for cuboid, cylinder or other shapes.
The dielectric constant of the dielectric resonance unit of described dielectric resonator antenna array can be adjusted.
From the above it can be seen that
It is an advantage of the current invention that:
(1) the RADIAL dielectric resonator antenna array that the present invention provides uses four amplitudes identical, and phase place is clockwise or inverse
The mode of the four feed point radial line slot waveguides that hour hands differ 90 ° successively encourages whole dielectric resonator antenna array, solves battle array
Array antenna feeding network is complicated, big problem is lost, and obtains high-gain, high calibre efficiency.
(2) the RADIAL dielectric resonator antenna array gap arrangement mode that the present invention provides is simple, by adjust gap with
And the parameter of dielectric resonator antenna array, good antenna performance can be obtained.
(3) the RADIAL dielectric resonator antenna array structure that the present invention provides is planar structure, and size is less, it is simple to processing
And mass production.
Accompanying drawing explanation
Fig. 1 is the main pseudosection of the present invention；
Fig. 2 is the feed section enlarged diagram of the present invention；
Fig. 3 is the circular polarisation arrangement mode schematic diagram of the unit dielectric resonator antenna of the present invention；
The dielectric resonator antenna unit of Fig. 4 present invention and the structural representation of its feed gaps；
Fig. 5 is the gap arrangement architecture figure to unit of the present invention；
Fig. 6 is the S parameter analogous diagram of the aerial array in the present embodiment.
Fig. 7 is that the gain of circular polarisation RADIAL dielectric resonance array antenna and axle are than the curve map with frequency.
Detailed description of the invention
Below in conjunction with drawings and Examples, the present invention is described in further detail.
The present invention is a kind of RADIAL dielectric resonator antenna array, as shown in Figures 1 and 2, the footpath cracked including upper surface
To line gap waveguide 1, dielectric resonator antenna array 2, feed section 3 and dielectric layer 4.
Radial line slot waveguide 1 includes metallic plate 1a, lower metal base plate 1b and metal sidewall 1c that upper surface cracks.On
RADIAL waveguide 1 entirety cracked in surface is cylindrical structural, and its height is less than 1/2nd wavelength.Upper strata slit metal 1a
Upper surface have a series of by the gap pair of regular array, dielectric resonator antenna array 2 is positioned at the metallic plate that upper surface cracks
The surface in 1a gap, is close to slit surfaces, coupling gap energy.Metallic plate 1a, the lower metal base plate 1b that upper surface cracks
Marginal portion be attached by metal sidewall 1c, formed one close cavity cylinder.
Dielectric resonator antenna array 2 is made up of several dielectric resonator antenna unit, correspondence one directly over each gap
Dielectric resonance unit, because of the gap arrangement mode phase of arrangement mode and upper strata slit metal 1a of this element dielectric resonator antenna
With, its arrangement mode can be found in Fig. 3.
Feed probes part 3 includes four metal bars 3a, 3b, 3c, 3d and four be connected with metal bar 3a, 3b, 3c, 3d
SMA antenna terminal 3e, 3f, 3g, 3h.Four feed probes are positioned at position and the holding of metal bar height of distance axle center same radius
Unanimously, four feed probes are symmetrical about the center of circle, are uniformly distributed, differ 90 ° on locus successively.Lower metal base plate 1b
Being provided with four corresponding with metal bar position through hole, four SMA antenna terminal 3e, 3f, 3g, 3h one end are from described lower metal
The through hole at base plate 1b center stretches out radial line slot waveguide 1 outside and is connected with feed coaxial cable；Metal bar 3a, 3b, 3c, 3d are certainly
Inside through hole feed-in radial line slot waveguide.
Dielectric layer 4 is made up of (such as Rogers 4350B, polytetrafluoroethyl-ne the medium of the low-k of columned hollow
Alkene plate etc.)
, it is filled in inside radial line slot waveguide.The RADIAL waveguide medium cracked by surface by four feed probes 3
Resonant antenna 2 emittance.
Feed probes part 3 connects SMA antenna terminal 3e, 3f, 3g, 3h, and array arranges with form of annular rings, feeds electromagnetic field
For the field of spiral rotating, four times and space differ the TM of 90 °11The field of (transverse magnetic wave) pattern
Constitute so that with fixed skew superposition electromagnetic wave between array element, form high-gain circularly polarised wave.RADIAL waveguide metal upper surface
The slot element cutting surfaces electric current of 1a, produces electric field on the narrow limit in gap, and the broadside in gap produces magnetic field, electric field and magnetic
Field can replace with equivalent current unit and equivalent magnetic current unit, make the energy in waveguide radiate, excitable media resonant element 2.
Comparing less due to gap width with gap length, operation wavelength again, so ignoring equivalent current unit, only considering equivalent magnetic current unit
Effect, dielectric resonance unit is positioned at directly over gap, is acted on by gap, lower section i.e. magnetic current, in dielectric resonance unit
Portion's excitation magnetizing field, thus to free space radiated electromagnetic wave.
Embodiment
Fig. 3 shows the arrangement scheme of this RADIAL dielectric resonator antenna array radiation circular polarisation electromagnetic wave.Equally, medium
The arrangement mode of resonant antenna array is identical with the gap arrangement mode of radial line slot waveguide, the most only describes radial line slot
The arrangement mode of Waveguide slot.
In this arrangement mode, radial line slot waveguide by the gap of a series of annular array to forming, and each array list
Unit comprises two mutually perpendicular gaps.At a distance of relatively near between two mutually perpendicular gaps, if each gap in enclosing
Center be connected with the center of circle, then the long limit in gap is identical with the angle of respective line of centres, but the long limit in the gap of different circle with
Each the angle angle of line of centres may be different.
Multiple slot elements as characterized above extend arrangement, each two phase from inside to outside according to the mode of donut
Adjacent gap between about distance half wavelength.
Derivation and the principle analysis of the circular polarisation arrangement scheme of this radial line slot antenna array are as follows:
Circularly polarised wave is identical by two amplitudes, the electromagnetic wave synthesis of quadrature in phase.Radial line slot antenna array gap pair
Two gaps in unit, at a distance of compared with near and identical with center of circle angle, can be approximately considered the electromagnetic wave amplitude of two gap radiations
Identical.Orthogonal condition ensures that radiated electromagnetic wave is spatially orthogonal.
Fig. 5 is circular polarisation slot element arrangement mode schematic diagram.Comprising two gaps pair in Fig. 5, each gap is to being referred to as
Being a slot element, one gap of gap a and gap b composition, to unit, gap c and gap d, constitutes a gap to list
Unit, illustrates as a example by gap a and gap b, gap a and gap b is mutually perpendicular to, and determines that the position of gap a is ρ1, the position of gap b
Put ρ1' determined by formula (1).
In formula (1), away from center of circle ρ1Place is first gap a of one group of slot pairs, away from center of circle ρ1' place is one group of gap
Second gap b of centering；The energy propagated for gap a in waveguide,Propagate for gap b in waveguide
Energy；For rightSeek phase place,For rightSeek phase place；Formula (1)
The position being determined by one group of slot pairs gap a, draw corresponding thereto, the position of the gap b of phase difference 90 degree
ρ1'。
The center of gap a with gap b is connected with the center of circle, this line and the included angle on the long limit of slot element1, by formula
(2) determine.
In formula (11), l is the length in gap, and δ is one group of slot pairs gap a and the distance of gap b.
The angle that gap b relative slot a turns overDetermined by formula (3).
Visible, in this arrangement mode, when a gap in array element is relative to the position ρ in the center of circle1After determining, should
All relativenesses of array element just have determined that.
The parameter determination method of adjacent slits pair is identical with above-mentioned formula, and the position of adjacent slits pair is by formula (3) and public affairs
Formula (4) determines.
β=2n* π/(1/2* λ) n=1,2,3,4,5 ... (4)
In above-mentioned formula, β is the angle turned between adjacent cells, in this scenario, the folder of each circle adjacent slits pair
Angle is set to identical numerical value, and φ1=φ2。
It can be seen that the slot element of radial line slot antenna arranges according to multi-turn mode in Fig. 3, figure is shown as two
Circle, if multi-turn, the slot element often enclosed is according to above-mentioned gap to regularly arranged, and often one wavelength of spacing between circle, often encloses bag
Including several gaps to unit, in actual product designs, one group of gap is relatively near to two dielectric resonance cell distances above,
Gap is identical relative to the angle that another pair dielectric resonance unit turns over to a pair dielectric resonance unit in unit, two media
The long limit of resonator is each the most identical with the angle of circle center line connecting with them.Diametrically, often circle gap is spaced between unit
One waveguide wavelength, by an antermarginal circle gap to 1/4th wavelength of sidewall away from radial line slot waveguide of unit.And
A waveguide wavelength is apart should be, to reach cophase detector between array element.
It is above the gap arrangement explanation of the radial line slot dielectric resonator antenna of circular polarisation.This circular polarized antenna uses four
Individual metal bar height is identical, and SMA identical feeder line feeds, and the phase place of four feed point is the most successively
Differing 90 ° of phase places, common effect produces circularly polarised wave, thus forms the aerial array of a radiation circularly polarised wave of high-gain.
Experimental verification:
Radial line slot waveguide 1, is that 240mm, apart the levels cylindrical metal plate of 8mm are constituted by radius.Upper strata is opened
Seam metallic plate 1a gap long 10mm, wide 2mm；
Feed probes part 3 uses the cylinder feed metal rod of diameter 1mm, gos deep into 7.65mm in waveguide；
Dielectric resonator antenna array 2, for the media units of multiple identical dielectric constants, dielectric constant is 6.15, and sheet material selects
With the long 5mm of Rogers RO3006, wide 2mm, high 4mm, according to the gap of upper strata slit metal 1a of radial line slot waveguide
Arrangement mode arranges, and arrangement mode is mentioned above: using five circle dielectric resonance unit, the dielectric resonance unit of adjacent turn is separated by
20mm, the number of every coil unit dielectric resonator is respectively 12,25,50,75 and 100 through optimizing.
Dielectric layer 4 be dielectric constant be the dielectric material of 1.6.
Dielectric resonator antenna array 2 is fed by crack RADIAL waveguide 1a, 1b, 1c of surface.
Fig. 6 is the S parameter analogous diagram of the aerial array in the present embodiment, it may be seen that circular polarisation RADIAL medium is humorous
The reflectance factor of aerial array of shaking is respectively less than-10dB at 11.7GHz to 12.2GHz, and mainly produces the most humorous on 12GHz
Shake, meet the requirement of the reflectance factor to circular polarisation RADIAL dielectric resonator antenna array.
Fig. 7 is that the gain of this circular polarisation RADIAL dielectric resonance array antenna and axle are than the curve map with frequency.By gain
Curve is visible, and its gain is more stable in whole working frequency range.The axle of this circular polarisation RADIAL dielectric resonance array antenna than
Also it is respectively less than 3dB in working frequency range, meets this antenna demand to circular polarisation.
More than in experiment, RADIAL dielectric resonator antenna array achieves good circular polarization radiation, and obtains 26dB's
Gain, the aperture efficiency of 44%.As circular polarized antenna, the scheme that the present invention proposes has preferable prospect of the application.
In actual applications, dielectric resonator antenna array can be two dimension or three-dimensional planar array；Dielectric resonance unit.
Can be solid rectangle, cylinder or other shapes；The unit medium block of dielectric resonator antenna array can use Single Medium resonance
Antenna or multiple dielectric resonator antenna stacking or combination are constituted；Dielectric resonance unit also can select applicable dielectric normal as required
The dielectric material of number.
It can be seen that described RADIAL Fed Dielectric Resonator aerial array uses four feed point radially from above-described embodiment
The mode excitable media resonant antenna array of line gap waveguide, and obtain high-gain, high calibre efficiency, and by adjusting gap
And the arrangement mode of dielectric resonator antenna array, the performance of circular polarized antenna can be optimized.
Those of ordinary skill in the field it is understood that the foregoing is only the specific embodiment of the present invention, and
Be not used in the restriction present invention, all within the spirit and principles in the present invention, any modification, equivalent substitution and improvement etc. done, all
Within protection scope of the present invention should being included in.
Claims (3)
1. a RADIAL dielectric resonator antenna array, including radial line slot waveguide, dielectric resonator antenna array, feed section
And dielectric layer；
Radial line slot waveguide includes that metallic plate, metal base plate and metal sidewall, metallic plate, metal base plate are circular, and edge leads to
Crossing metal sidewall to be attached, radial line slot waveguide forms cavity cylinder, and height is less than 1/2nd wavelength, on metallic plate
Surface is provided with gap, and two gaps form a gap pair, and gap is to being arranged regularly, and metal base plate circle centre position is provided with boss,
Boss is provided with four through holes, and four through holes are about metal base plate center of circle Central Symmetry；
Dielectric layer is hollow cylindrical, is filled in inside radial line slot waveguide, and hollow space is relative with the boss of metal base plate
Should；
Dielectric resonator antenna array includes several dielectric resonator antenna unit, and dielectric resonator antenna unit is positioned at table on metallic plate
The surface in gap, face；
Feed probes part includes four metal bars and four SMA antenna terminals, a metal bar and a SMA antenna terminal even
Connect, form a feed probes；
Four feed probes lay respectively in four through holes of metal base plate boss, and metal bar is highly consistent, four feed probes
Differing 90 ° on locus successively, metal bar is inside through hole feed-in radial line slot waveguide, and SMA antenna terminal stretches out logical
Hole, is positioned at radial line slot waveguide external, is connected with feed coaxial cable.
A kind of RADIAL dielectric resonator antenna array the most according to claim 1, the material of described dielectric layer uses low
The medium of dielectric constant.
A kind of RADIAL dielectric resonator antenna array the most according to claim 1, described gap to i.e. gap to unit,
Two gaps therein are mutually perpendicular to, gap to circular array, the adjacent gap of each two to spacing half wavelength, if
Gap is respectively gap a and gap b, gap a and gap b and is mutually perpendicular to the gap in unit, determines that the position of gap a is
ρ1, the position ρ of gap b1' determined by formula (1):
Wherein, away from center of circle ρ1Place is first gap a of one group of slot pairs, away from center of circle ρ1' place is the second of one group of slot pairs
Individual gap b；The energy propagated for gap a in waveguide,The energy propagated for gap b in waveguide；For rightSeek phase place,For rightSeek phase place；
The center of gap a with gap b is connected with the center of circle, this line and the included angle on the long limit of slot element1, true by formula (2)
Fixed:
In wherein, l is the length in gap, and δ is one group of slot pairs gap a and the distance of gap b；
The angle that gap b relative slot a turns overDetermined by formula (3):
The position of adjacent slits pair is determined by formula (3) and formula (4):
β=2n* π/(1/2* λ) n=1,2,3,4,5 ... (4)
Wherein, β is the angle turned between adjacent cells, and the angle of each circle adjacent slits pair is set to identical numerical value, and
And φ1=φ2；
Slot element arranges according to multi-turn mode, and between the slot element often enclosed, spacing is a wavelength.
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| CN201610428129.1A CN105870637A (en) | 2016-06-16 | 2016-06-16 | Radial line dielectric resonant antenna array |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108631066A (en) * | 2017-03-24 | 2018-10-09 | 日本电产株式会社 | Slot array antenna and radar with the slot array antenna |
| CN108649325A (en) * | 2018-03-20 | 2018-10-12 | 北京邮电大学 | A kind of wide band high-gain millimeter wave dielectric resonant antenna array |
| CN109638427A (en) * | 2018-12-26 | 2019-04-16 | 南通大学 | The low axis in broadband compares circular polarized antenna |
| CN111816979A (en) * | 2019-04-10 | 2020-10-23 | 华为技术有限公司 | Surface wave exciter and communication system |
| CN112713413A (en) * | 2020-12-17 | 2021-04-27 | 中车青岛四方机车车辆股份有限公司 | Spiral array antenna |
| CN112968289A (en) * | 2021-02-05 | 2021-06-15 | 维沃移动通信有限公司 | Slot antenna, touch control pen and electronic equipment |
| CN115051153A (en) * | 2022-07-27 | 2022-09-13 | 重庆邮电大学 | Differential circular polarization filtering antenna |
| CN115117634A (en) * | 2022-06-30 | 2022-09-27 | 电子科技大学 | High-gain circularly polarized beam scanning antenna with transmission super surface |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108631066A (en) * | 2017-03-24 | 2018-10-09 | 日本电产株式会社 | Slot array antenna and radar with the slot array antenna |
| CN108649325A (en) * | 2018-03-20 | 2018-10-12 | 北京邮电大学 | A kind of wide band high-gain millimeter wave dielectric resonant antenna array |
| CN109638427A (en) * | 2018-12-26 | 2019-04-16 | 南通大学 | The low axis in broadband compares circular polarized antenna |
| CN109638427B (en) * | 2018-12-26 | 2020-09-15 | 南通大学 | Broadband low axial ratio circularly polarized antenna |
| CN111816979A (en) * | 2019-04-10 | 2020-10-23 | 华为技术有限公司 | Surface wave exciter and communication system |
| CN112713413A (en) * | 2020-12-17 | 2021-04-27 | 中车青岛四方机车车辆股份有限公司 | Spiral array antenna |
| CN112968289A (en) * | 2021-02-05 | 2021-06-15 | 维沃移动通信有限公司 | Slot antenna, touch control pen and electronic equipment |
| CN115117634A (en) * | 2022-06-30 | 2022-09-27 | 电子科技大学 | High-gain circularly polarized beam scanning antenna with transmission super surface |
| CN115051153A (en) * | 2022-07-27 | 2022-09-13 | 重庆邮电大学 | Differential circular polarization filtering antenna |
| CN115051153B (en) * | 2022-07-27 | 2023-07-18 | 重庆邮电大学 | Differential circular polarization filter antenna |
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Application publication date: 20160817 |