CN114464995B - Circularly polarized array antenna based on surface plasmon - Google Patents
Circularly polarized array antenna based on surface plasmon Download PDFInfo
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- CN114464995B CN114464995B CN202210127028.6A CN202210127028A CN114464995B CN 114464995 B CN114464995 B CN 114464995B CN 202210127028 A CN202210127028 A CN 202210127028A CN 114464995 B CN114464995 B CN 114464995B
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- 230000005855 radiation Effects 0.000 claims abstract description 23
- 239000000523 sample Substances 0.000 claims abstract description 12
- 230000010363 phase shift Effects 0.000 claims description 4
- 230000010287 polarization Effects 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 7
- 238000004891 communication Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 238000005192 partition Methods 0.000 description 4
- 230000002401 inhibitory effect Effects 0.000 description 3
- 238000004088 simulation Methods 0.000 description 3
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005388 cross polarization Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
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- 238000009434 installation Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
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Classifications
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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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/0006—Particular feeding 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q3/00—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system
- H01Q3/26—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the relative phase or relative amplitude of energisation between two or more active radiating elements; varying the distribution of energy across a radiating aperture
- H01Q3/30—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the relative phase or relative amplitude of energisation between two or more active radiating elements; varying the distribution of energy across a radiating aperture varying the relative phase between the radiating elements of an array
- H01Q3/34—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the relative phase or relative amplitude of energisation between two or more active radiating elements; varying the distribution of energy across a radiating aperture varying the relative phase between the radiating elements of an array by electrical means
- H01Q3/36—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the relative phase or relative amplitude of energisation between two or more active radiating elements; varying the distribution of energy across a radiating aperture varying the relative phase between the radiating elements of an array by electrical means with variable phase-shifters
- H01Q3/38—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the relative phase or relative amplitude of energisation between two or more active radiating elements; varying the distribution of energy across a radiating aperture varying the relative phase between the radiating elements of an array by electrical means with variable phase-shifters the phase-shifters being digital
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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- Waveguide Aerials (AREA)
Abstract
The invention discloses a circularly polarized array antenna based on surface plasmons, which comprises an upper medium substrate and a lower medium substrate; the upper surface of the upper medium substrate is provided with four radiation patches which are rotationally symmetrically arranged along the center of the upper medium substrate, the radiation patches are crescent and square grooves are etched at the edges, and the square grooves are used for generating artificial surface plasmons; the upper surface of the lower medium substrate is provided with a phase-shifting feed network and a circular patch, the phase-shifting feed network comprises four signal output ports, metal probes are respectively arranged on the four signal output ports, and the metal probes are upwards and respectively connected with the radiation patch for feeding; the circular patch comprises an inner circle and a circular ring sleeved on the edge of the inner circle, and a strip-shaped groove is etched on the circular ring along the circumference and is used for generating local surface plasmons; the invention can realize high-index impedance bandwidth, circular polarization bandwidth and high gain.
Description
Technical Field
The invention relates to a circularly polarized array antenna based on surface plasmons, and belongs to the technical field of electronic communication.
Background
With the development of space technology and communication fields, circularly polarized antennas have been widely used in radar, satellite communication, military and various mobile communication systems. Compared with the linear polarized wave, the circular polarized wave can inhibit rain and fog interference, reduce multipath reflection and have good mobility, and in a transmitting and receiving system, as long as one party applies the circular polarized antenna, the receiving antenna can receive signals in any rotation direction, thereby greatly facilitating the application in a wireless communication system. The array antenna is used as a novel antenna, and the same single units form an antenna system according to a certain arrangement mode. Different arrangements and feeding modes can generate different radiation patterns, so that the gain of the antenna is improved.
The circularly polarized array antenna has the advantages of light weight, small volume, easy processing, convenient integration with integrated circuits and the like, and is widely applied. As an important infrastructure of the emerging industry of communication, the domestic circular polarized array antenna design still has the problems of single function, poor performance and low gain.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, provides a circularly polarized array antenna based on surface plasmons, and solves the technical problem that the existing circularly polarized array antenna is poor in performance.
In order to achieve the above purpose, the invention is realized by adopting the following technical scheme:
a circularly polarized array antenna based on surface plasmons comprises an upper dielectric substrate and a lower dielectric substrate; the upper surface of the upper medium substrate is provided with four radiation patches which are rotationally symmetrically arranged along the center of the upper medium substrate, the radiation patches are crescent and square grooves are etched at the edges, and the square grooves are used for generating artificial surface plasmons; the upper surface of the lower medium substrate is provided with a phase-shifting feed network and a circular patch, the phase-shifting feed network comprises four signal output ports, metal probes are respectively arranged on the four signal output ports, and the metal probes are upwards connected with the radiation patches respectively for feeding; the circular patch comprises an inner circle and a circular ring sleeved on the edge of the inner circle, wherein a strip-shaped groove is etched on the circular ring along the circumference and is used for generating local surface plasmons.
Optionally, the size of the circularly polarized array antenna is 2.75λg×2.75λg×0.63λg, where λg is a guide wavelength.
Optionally, the upper layer dielectric substrate and the lower layer dielectric substrate are both insulating F4B dielectric substrates with a dielectric constant of 2.2 and a loss tangent of 0.003.
Optionally, the radiation patch includes a base circle and a circular groove formed on the base circle, and a cross-shaped groove is etched on the base circle; the circle center of the circular groove is positioned at the edge of the base circle, and the radius of the circular groove is smaller than that of the base circle.
Optionally, four electromagnetic band gap structures are symmetrically arranged on the upper layer dielectric substrate along the center rotation, each electromagnetic band gap structure comprises a plurality of metal circles with equal radius, the circle centers of the metal circles are positioned on the same straight line and are arranged at intervals, round holes are etched in the centers of the metal circles, and the metal circles are arranged on the upper surface and the lower surface of the upper layer dielectric substrate in a one-to-one correspondence mode.
Optionally, the phase-shifting feed network further comprises a first equal division wilkinson power divider, two second equal division wilkinson power dividers, a microstrip line, two 90 ° phase shifters and a 180 ° phase shifter; the input end of the first equal-division Wilkinson power divider is connected with a signal source, the output ends of the first equal-division Wilkinson power divider are respectively connected to the input ends of the two second equal-division Wilkinson power dividers through microstrip lines, the output ends of the two second equal-division Wilkinson power dividers are respectively connected to four signal output ports through microstrip lines, the 180-degree phase shifter is arranged on the microstrip line connected with one side output end of the first equal-division Wilkinson power divider, and the two 90-degree phase shifters are respectively arranged on the microstrip lines connected with the two opposite signal output ports.
Optionally, the microstrip lines are arranged in an irregular curved shape.
Optionally, the microstrip line side that 180 phase shifters are connected is provided with a plurality of first bar paster, first partition wilkinson power divider both sides are provided with the second bar paster respectively, be provided with the third bar paster on the lower floor dielectric substrate, keep away from first partition wilkinson power divider one side, the interior side of first bar paster, second bar paster and third bar paster has the rectangular channel of etching.
Optionally, the middle part of the second strip-shaped patch is protruded towards the middle part of the lower layer medium substrate, and the ends of the second strip-shaped patch and the two second strip-shaped patches respectively extend to the outer sides of the four signal output ports.
Compared with the prior art, the invention has the beneficial effects that:
the circularly polarized array antenna based on the surface plasmons provided by the embodiment of the invention adopts the phase-shifting feed network with four signal output ports, the four signal output ports feed power to the serrated crescent-shaped radiation patch of the upper dielectric substrate through the metal probe, and artificial surface plasmons and local surface plasmons are introduced, so that the gain is improved through local energy. In addition, an electromagnetic band gap structure is introduced for inhibiting harmonic wave and electromagnetic surface wave propagation, and the electromagnetic band gap structure has the effect of resisting multipath interference so as to further improve the gain. The invention can realize high-index impedance bandwidth, circular polarization bandwidth and high gain.
Drawings
Fig. 1 is a schematic structural diagram of a circularly polarized array antenna according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of the upper surface structure of an upper dielectric substrate according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of the upper surface structure of a lower dielectric substrate according to an embodiment of the present invention;
FIG. 4 is a schematic view of a reflective cavity installation provided by an embodiment of the present invention;
FIG. 5 is a schematic illustration of a first sizing provided by an embodiment of the present invention;
FIG. 6 is a second schematic illustration of dimensioning provided by an embodiment of the present invention;
fig. 7 is a schematic diagram of gain contrast curves of a circularly polarized array antenna and a conventional circularly polarized 2×2 array antenna according to an embodiment of the present invention;
fig. 8 is a schematic diagram of |s11| of a simulation result of a circularly polarized array antenna according to an embodiment of the present invention;
fig. 9 is an axial ratio diagram of simulation results of a circularly polarized array antenna according to an embodiment of the present invention;
fig. 10 is a schematic view of a circular polarized array antenna according to an embodiment of the present invention at 0 ° at 5 GHz;
fig. 11 is a schematic diagram of a direction of 90 ° of a circularly polarized array antenna provided by an embodiment of the present invention at 5 GHz;
marked in the figure as:
1. the device comprises an upper layer medium substrate, 2, a lower layer medium substrate, 3, a radiation patch, 31, a square groove, 32, a base circle, 33, a round groove, 34, a groove, 4, a phase shift feed network, 41, a signal output port, 42, a first equal division wilkinson power divider, 43, a second equal division wilkinson power divider, 44, a microstrip line, 45, a 90 DEG phase shifter, 46, a 180 DEG phase shifter, 5, a round patch, 51, an inner circle, 52, a round ring, 53, a strip groove, 6, a metal probe, 7, an electromagnetic band gap structure, 71, a metal circle, 72, a round hole, 8, a first strip patch, 81, a second strip patch, 82, a third strip patch, 83 and a rectangular groove.
Detailed Description
The invention is further described below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical aspects of the present invention, and are not intended to limit the scope of the present invention.
Embodiment one:
as shown in fig. 1-3, a circularly polarized array antenna based on surface plasmons comprises an upper dielectric substrate 1 and a lower dielectric substrate 2; the upper surface of the upper medium substrate 1 is provided with radiation patches 3, the radiation patches 3 are provided with four radiation patches and are rotationally symmetrically arranged along the center of the upper medium substrate 1, the radiation patches 3 are crescent and are etched with square grooves 31 at the edges, and the square grooves 31 are used for generating artificial surface plasmons; the upper surface of the lower medium substrate 2 is provided with a phase-shifting feed network 4 and a circular patch 5, the phase-shifting feed network 4 comprises four signal output ports 41, the four signal output ports 41 are respectively provided with a metal probe 6, and the metal probes 6 are upwards connected with the radiation patch 3 respectively for feeding; the circular patch 5 comprises an inner circle 51 and a circular ring 52 sleeved on the edge of the inner circle 51, wherein a strip-shaped groove 53 is etched on the circular ring 52 along the circumference, and the strip-shaped groove 53 is used for generating local surface plasmons.
The phase-shifting feed network 4 with four signal output ports 41 is adopted, the four signal output ports 41 feed power to the radiation patch on the upper medium substrate 1 through the metal probe 6, so that the mutual influence between the phase-shifting feed network 4 and the radiation patch 3 is reduced, and the bandwidth is improved; and introducing artificial surface plasmons and local surface plasmons, and improving gain through local energy.
The circular patch 5 adopts two sun-like structures to combine localized surface plasmons with the phase-shift feed network 4, which can reduce the coupling between the radiation patch 3 and the phase-shift feed network 4 (increase due to shorter distance), thereby improving the axial ratio. And the local energy increases gain, and has good field enhancement effect and electromagnetic wave restriction effect.
Four electromagnetic band gap structures 7 are symmetrically arranged on the upper medium substrate 1 along the center rotation, each electromagnetic band gap structure 7 comprises a plurality of metal circles 71 with equal radius, the circle centers of the metal circles 71 are positioned on the same straight line and are arranged at intervals, round holes are etched in the centers of the metal circles 71, and the metal circles 71 are arranged on the upper surface and the lower surface of the upper medium substrate 1 in a one-to-one correspondence mode. By introducing the electromagnetic band gap structure 7, the gain is further improved, and the electromagnetic band gap structure is used for inhibiting harmonic wave and electromagnetic surface wave propagation and has the effect of resisting multipath interference. The invention can realize high-index impedance bandwidth, circular polarization bandwidth and high gain.
The radiation patch 3 comprises a base circle 32 and a round groove 33 arranged on the base circle 32, wherein a cross-shaped groove 34 is etched on the base circle 32; the center of the circular groove 33 is positioned at the edge of the base circle 32, and the radius of the circular groove 33 is smaller than that of the base circle 32 to form a crescent shape, so that interference generates two orthogonal modes to form circular polarization; the current path can be changed by the cross-shaped groove 34. In practical implementation, the crescent-shaped arrangement can be opposite to the upper medium substrate 1, and meanwhile, the square groove 31 positioned at the edge of the circular groove 33 is uniformly and rotatably arranged along the circle center of the circular groove 33, and the square groove 31 positioned at the edge of the base circle 32 is uniformly and rotatably arranged along the circle center of the base circle.
The phase-shifting feed network 4 further comprises a first equally divided wilkinson power divider 42, two second equally divided wilkinson power dividers 43, a microstrip line 44, two 90 ° phase shifters 45 and a 180 ° phase shifter 46; the input end of the first equal-division wilkinson power divider 42 is connected with a signal source, the output ends of the first equal-division wilkinson power divider 42 are respectively connected with the input ends of the two second equal-division wilkinson power dividers 43 through microstrip lines 44, the output ends of the two second equal-division wilkinson power dividers 43 are respectively connected with four signal output ports through microstrip lines 44, a 180-degree phase shifter 46 is arranged on the microstrip line 44 connected with one side output end of the first equal-division wilkinson power divider 42, and two 90-degree phase shifters 45 are respectively arranged on the microstrip line 44 connected with the two opposite signal output ports 41. Wherein the microstrip lines 44 are arranged in an irregularly curved shape.
The Wilkinson power divider divides an input signal into two signals, so that more balanced power distribution can be realized, and the bandwidth is improved. Then, the phase difference is adjusted over a wider frequency band using the phase shifter. A phase difference of 90 ° is achieved with a microstrip line of quarter wavelength difference.
The microstrip line side that 180 phase shifter 46 connects is provided with a plurality of first bar paster 8, first partition wilkinson power divider 42 both sides are provided with second bar paster 81 respectively, be provided with third bar paster 82 on lower floor's dielectric substrate 2 far away from first partition wilkinson power divider 42 one side, the medial edge of first bar paster 8, second bar paster 81 and third bar paster 82 all etches rectangular channel 83, the middle part of second bar paster 81 is protruding towards the middle part of lower floor's dielectric substrate 2, the tip of second bar paster 81 and two second bar paster 81 extends to the outside of four signal output ports 41 respectively. The artificial surface plasmons are introduced into the lower dielectric substrate 2 where the feed network is located through the first strip-shaped patch 8, the second strip-shaped patch 81 and the third strip-shaped patch 82, and crosstalk is restrained by mode mismatch between the structure and the microstrip line 44, so that coupling of the microstrip line 44 is reduced, and gain of the antenna is improved.
The dimensions of the circularly polarized array antenna are 2.75λg×2.75λg×0.63λg, λg being the guide wavelength. The upper dielectric substrate 1 and the lower dielectric substrate 2 are both insulating F4B dielectric substrates having a dielectric constant of 2.2 and a loss tangent of 0.003.
As shown in fig. 4-6 and table one, specific structural parameters of the circularly polarized array antenna provided in this embodiment are determined, and a reflective cavity 9 is disposed outside the circularly polarized array antenna; gain contrast is performed with a traditional circularly polarized 2 x 2 array antenna;
the first table is:
| parameters (parameters) | l 1 | w 1 | w 2 | w 3 | w 4 |
| Value (mm) | 60 | 1.5 | 0.5 | 0.84 | 1.1 |
| Parameters (parameters) | w 5 | r 1 | r 2 | r 3 | l 2 |
| Value (mm) | 0.2 | 12 | 0.4 | 2 | 120 |
As shown in fig. 7, by comparing the gain of the conventional circular polarized 2×2 array antenna (Initial) with the gain of the circular polarized array antenna (Final) provided in this embodiment, it is known that the gain peak of the conventional circular polarized 2×2 array antenna is 10.42dBi, and the gain peak of the circular polarized array antenna provided in this embodiment is 12.89dBi, which significantly improves the antenna gain in this embodiment. Gain Total (dB) is Gain and Frequency (GHz) is frequency.
FIGS. 8-9 illustrate the |S of the present invention 11 Simulation results of the i and the axial ratio. The impedance bandwidth is 3.10-6.66GHz, the relative bandwidth is 71.2%, the axial ratio bandwidth is 3.38-7.18GHz, and the relative bandwidth is 76%.
Fig. 10-11 show the 0 deg. and 90 deg. patterns of the present invention at 5 GHz. It can be seen that cross polarization is significantly suppressed.
The circularly polarized array antenna based on surface plasmons provided by the embodiment adopts the phase-shifting feed network 4 with four signal output ports 41, the four signal output ports 41 feed power to the serrated crescent radiation patch 3 of the upper dielectric substrate 1 through the metal probe 6, artificial surface plasmons and local surface plasmons are introduced, and the gain is improved through local energy. In addition, an electromagnetic band gap structure 7 is also introduced for inhibiting harmonic wave and electromagnetic surface wave propagation, and has the effect of resisting multipath interference so as to further improve the gain. The invention can realize high-index impedance bandwidth, circular polarization bandwidth and high gain.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that modifications and variations could be made by those skilled in the art without departing from the technical principles of the present invention, and such modifications and variations should also be regarded as being within the scope of the invention.
Claims (9)
1. The circularly polarized array antenna based on the surface plasmon is characterized by comprising an upper dielectric substrate and a lower dielectric substrate; the upper surface of the upper medium substrate is provided with four radiation patches which are rotationally symmetrically arranged along the center of the upper medium substrate, the radiation patches are crescent and square grooves are etched at the edges, and the square grooves are used for generating artificial surface plasmons; the upper surface of the lower medium substrate is provided with a phase-shifting feed network and a circular patch, the phase-shifting feed network comprises four signal output ports, metal probes are respectively arranged on the four signal output ports, and the metal probes are upwards connected with the radiation patches respectively for feeding; the circular patch comprises an inner circle and a circular ring sleeved on the edge of the inner circle, wherein a strip-shaped groove is etched on the circular ring along the circumference and is used for generating local surface plasmons.
2. The circularly polarized array antenna as claimed in claim 1, wherein the circularly polarized array antenna has dimensions of 2.75λg×2.75λg×0.63 λg, λg being a guide wavelength.
3. The circularly polarized array antenna based on surface plasmons according to claim 1, wherein the upper layer dielectric substrate and the lower layer dielectric substrate are both insulating F4B dielectric substrates with a dielectric constant of 2.2 and a loss tangent of 0.003.
4. The circularly polarized array antenna of claim 1, wherein the radiating patch comprises a base circle and a circular groove formed on the base circle, wherein the base circle is etched with a cross-shaped groove; the circle center of the circular groove is positioned at the edge of the base circle, and the radius of the circular groove is smaller than that of the base circle.
5. The circularly polarized array antenna based on surface plasmons according to claim 1, wherein four electromagnetic band gap structures are symmetrically arranged on the upper dielectric substrate along the center rotation, each electromagnetic band gap structure comprises a plurality of metal circles with equal radius, the circle centers of the metal circles are positioned on the same straight line and are arranged at intervals, round holes are etched in the centers of the metal circles, and the metal circles are arranged on the upper surface and the lower surface of the upper dielectric substrate in a one-to-one correspondence mode.
6. The circularly polarized array antenna as claimed in claim 1, wherein the phase shift feed network further comprises a first equally divided wilkinson power divider, two second equally divided wilkinson power dividers, a microstrip line, two 90 ° phase shifters, and a 180 ° phase shifter; the input end of the first equal-division Wilkinson power divider is connected with a signal source, the output ends of the first equal-division Wilkinson power divider are respectively connected to the input ends of the two second equal-division Wilkinson power dividers through microstrip lines, the output ends of the two second equal-division Wilkinson power dividers are respectively connected to four signal output ports through microstrip lines, the 180-degree phase shifter is arranged on the microstrip line connected with one side output end of the first equal-division Wilkinson power divider, and the two 90-degree phase shifters are respectively arranged on the microstrip lines connected with the two opposite signal output ports.
7. The circularly polarized array antenna as claimed in claim 6, wherein the microstrip lines are arranged in an irregularly curved configuration.
8. The circularly polarized array antenna based on surface plasmons of claim 6, wherein a plurality of first strip-shaped patches are arranged on the side edges of the microstrip line connected with the 180-degree phase shifter, second strip-shaped patches are respectively arranged on two sides of the first equal-division wilkinson power divider, a third strip-shaped patch is arranged on one side, far away from the first equal-division wilkinson power divider, of the lower-layer medium substrate, and rectangular grooves are etched on the inner side edges of the first strip-shaped patches, the second strip-shaped patches and the third strip-shaped patches.
9. The circularly polarized array antenna as claimed in claim 8, wherein the second strip-shaped patch is protruded toward the middle of the lower dielectric substrate, and the second strip-shaped patch and the ends of the two second strip-shaped patches are respectively extended to the outer sides of the four signal output ports.
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