CN115020981A - Array antenna applied to 5G communication - Google Patents

Array antenna applied to 5G communication Download PDF

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Publication number
CN115020981A
CN115020981A CN202210729775.7A CN202210729775A CN115020981A CN 115020981 A CN115020981 A CN 115020981A CN 202210729775 A CN202210729775 A CN 202210729775A CN 115020981 A CN115020981 A CN 115020981A
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layer
array antenna
feet
power divider
antenna
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CN115020981B (en
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李俊
王彦杰
熊世杰
张尔翀
邹毅
丰光银
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South China University of Technology SCUT
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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
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/52—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure
    • H01Q1/521—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure reducing the coupling between adjacent antennas
    • 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
    • H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
    • H01Q5/30—Arrangements for providing operation on different wavebands
    • 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

Abstract

The invention discloses an array antenna applied to 5G communication, relates to the 5G communication technology, and provides a scheme aiming at the problem that AVA in the prior art cannot be realized in an array mode. The top layer antenna board is provided with a 1-minute four-feed network and four top layer feedback feet; four output ends of the feed network are connected with the top-layer feedback pins; the bottom layer antenna board is provided with a grounding substrate and four bottom layer feet; the bottom layer of the back feet are uniformly and correspondingly positioned below the top layer of the back feet; an isolation groove is arranged between the lower parts of the two adjacent bottom layer feet; the top layer reverse foot and the bottom layer reverse foot which are overlapped up and down form an AVA unit. The advantages that the traditional AVA can be arrayed, the isolation groove effectively reduces the mutual coupling interference of all AVA units, and the performance of the whole antenna is improved. The antenna is particularly suitable for the field of 5G communication, the gain of more than 14dB is kept in the range of 24.5GHz to 35.8GHz, the gain at 29GHz is as high as 16.05dB, the in-band fluctuation is less than 2dB, the antenna has relatively flat response, and the characteristics of high gain and high stability of the array antenna are reflected.

Description

Array antenna applied to 5G communication
Technical Field
The invention relates to an antipodal Vivaldi antenna, in particular to an array antenna applied to 5G communication.
Background
AVA, Antipodal Vivaldi Antenna. The millimeter wave antenna is an important module in a 5G communication radio frequency chip, is widely applied to automobile radars, precise guidance, satellite communication and the like, and further enters the field of civil communication in the future. In recent years, China invests huge resources to develop the scientific frontier research of radio astronomy and the development of large radio astronomical telescopes. The sky speed of the radio telescope is in direct proportion to the bandwidth of the ultra-wideband antenna of the phased array feed source. The Vivaldi antenna is used as an ultra-wideband antenna, has the advantages of miniaturization, high gain, easiness in processing and the like, and is widely used as an ultra-wideband antenna array element to design an ultra-wideband phased array antenna. For example, westerberg synthetic aperture telescope in the netherlands uses Vivaldi antennas as phased array antenna elements.
In the prior art, research on an antipodal Vivaldi antenna monomer is basically carried out, such as CN113381183A and CN 112909527A. However, in the field of high-frequency 5G communication, a single antenna cannot be simply spliced and combined to become an array antenna. The range to be considered includes reflection loss, isolation and other factors, so that no specific implementation scheme of the array antenna based on the AVA exists at present.
Disclosure of Invention
The present invention is directed to an array antenna for 5G communication, which solves the above problems of the prior art.
The invention relates to an array antenna applied to 5G communication, which comprises a top layer antenna board arranged at the top of a dielectric board and a bottom layer antenna board arranged at the bottom of the dielectric board;
the lower part of the top layer antenna board is provided with a feed network of 1 minute four, and the upper part of the top layer antenna board is provided with four top layer reaction feet; four output ends of the feed network are connected with the input ends of the top-layer back legs in a one-to-one correspondence manner;
the feed network comprises a first T-shaped microstrip line power divider and two second T-shaped microstrip line power dividers; the two output ends of the first T-shaped microstrip line power divider are connected with the input end of the second T-shaped microstrip line power divider in a one-to-one correspondence manner;
the lower part of the bottom antenna plate is provided with a horizontally extending grounding substrate, the upper part of the bottom antenna plate is provided with four bottom reflection feet, and the grounding substrate is electrically connected with all the bottom reflection feet; each bottom layer of the back feet is uniformly and correspondingly positioned below the top layer of the back feet; an isolation groove is arranged between the lower parts of the two adjacent bottom layer feet;
the top layer reverse foot and the bottom layer reverse foot which are overlapped up and down form an AVA unit.
The isolation groove is of a wedge-shaped structure with a narrow upper part and a wide lower part.
The isolation groove is of a two-section structure, the lower part of the bottom layer counter-foot comprises a holding edge and a converging edge which are sequentially connected from top to bottom, wherein the extending direction of the holding edge is perpendicular to the grounding substrate, and the extending direction of the converging edge and the holding edge form a non-zero included angle and enable the lower part of the bottom layer counter-foot to inwardly converge.
And the input end of the first T-shaped microstrip line power divider is also provided with an SPP structure.
The groove depth of the SPP structure is linearly deepened from the upper end and the lower end to the middle, and the groove depth is symmetrical left and right.
And a first isosceles triangular notch which is sunken downwards is arranged at the joint of the middle part of the first T-shaped microstrip line power divider.
And a second isosceles triangular notch which is sunken downwards is arranged at the middle part connection part of the second T-shaped microstrip line power divider.
And a first isosceles right-angle triangular notch is arranged at the joint of the output end of the first T-shaped microstrip line power divider and the input end of the second T-shaped microstrip line power divider.
And a second isosceles right-angle triangular notch is arranged at the joint of the output end of the second T-shaped microstrip line power divider and the input end of the top layer reverse leg.
The array antenna applied to 5G communication has the advantages that the traditional AVA can be arrayed, the mutual coupling interference of all AVA units is effectively reduced by the isolation groove, and the performance of the whole antenna is improved. The SPP structure enables the array antenna to have a high-gain effect, and the structure is simple and easy to process. The working frequency band effectively covers the 5G frequency band, and is particularly suitable for the 5G communication field. The gain of more than 14dB is kept in the range of 24.5GHz to 35.8GHz, the gain at 29GHz is as high as 16.05dB, the in-band fluctuation is less than 2dB, the response is relatively flat, and the characteristics of high gain and high stability of the array antenna are reflected.
Drawings
Fig. 1 is a schematic structural diagram of an array antenna according to the present invention.
Fig. 2 is a schematic diagram of a top antenna board structure of the array antenna of the present invention.
Fig. 3 is a schematic structural diagram of a bottom antenna board of the array antenna according to the present invention.
Fig. 4 is a schematic diagram of a feed network structure of the array antenna of the present invention.
Fig. 5 is a partially enlarged view of a portion a in fig. 4.
Fig. 6 is a schematic diagram of the variation of groove depth of the SPP structure shown in fig. 5.
Fig. 7 is a partially enlarged view at B in fig. 4.
Fig. 8 is a partially enlarged view at C in fig. 3.
Fig. 9 is a schematic view showing the direction in which the holding section and the separation section of the separation groove shown in fig. 8 extend.
Fig. 10 is a schematic drawing of the dimensional indicia of the structure shown in fig. 1.
Fig. 11 is a schematic drawing of the dimensional indicia of the structure shown in fig. 5.
Fig. 12 is a schematic drawing of the dimensional indicia of the structure shown in fig. 7.
Fig. 13 is a comparison graph of the isosceles right triangle notch of the array antenna of the present invention and the S11 parameter curve without the notch.
Fig. 14 is a comparison graph of the isosceles triangle notch of the array antenna of the present invention and the S11 parameter curve without the notch.
Fig. 15 is a dispersion curve diagram of the SPP structure of the array antenna of the present invention at different groove depths.
Fig. 16 is a graph comparing the SPP configuration of the array antenna of the present invention with the curve of the S11 parameter without configuration.
Fig. 17 is a graph comparing the curves of the S11 parameter with the isolation slot and without the isolation slot of the array antenna according to the present invention.
Fig. 18 is a graph comparing the gain curve of the array antenna according to the present invention with the isolation slot and without the isolation slot.
Fig. 19 is a normalized E-plane and H-plane radiation pattern simulated at 26GHz for an array antenna according to the present invention.
Fig. 20 is a normalized E-plane and H-plane radiation pattern simulated at 30GHz for an array antenna according to the present invention.
Fig. 21 is a normalized E-plane and H-plane radiation pattern simulated at 34GHz for an array antenna in accordance with the present invention.
Reference numerals:
100-top antenna board;
110-top layer foot reversal:
120-feed network: 121-a first T-shaped microstrip line power divider, 122-a second T-shaped microstrip line power divider, 123-a first isosceles triangular notch, 124-an SPP structure, 125-a second isosceles triangular notch, 126-a first isosceles right triangular notch and 127-a second isosceles right triangular notch;
200-a bottom layer antenna board;
210-bottom layer foot reversal: 211-hold edge, 212-convergence edge;
220-a grounded substrate;
230-an isolation trench;
300-AVA unit.
Detailed Description
As shown in fig. 1 to 9, the array antenna applied to 5G communication according to the present invention includes a top antenna board 100 disposed on the top of a dielectric board and a bottom antenna board 200 disposed on the bottom of the dielectric board.
The lower part of the top-layer antenna board 100 is provided with a feed network 120 divided into four parts, and the upper part is provided with four top-layer reaction feet 110. Four output terminals of the feeding network 120 are connected to the input terminals of one top-layer feedback pin 110 in a one-to-one correspondence.
The feeding network 120 includes a first T-shaped microstrip power divider 121 and two second T-shaped microstrip power dividers 122. Two output ends of the first T-shaped microstrip power divider 121 are connected to the input end of the second T-shaped microstrip power divider 122 in a one-to-one correspondence.
The lower part of the bottom-layer antenna board 200 is provided with a horizontally extending grounding substrate 220, the upper part is provided with four bottom-layer reflection feet 210, and the grounding substrate 220 is electrically connected with all the bottom-layer reflection feet 210. Each bottom layer back foot 210 is uniformly positioned under a corresponding top layer back foot 110. An isolation groove 230 is formed between the lower portions of two adjacent bottom layer feet 210.
The top layer back foot 110 and the bottom layer back foot 210, which are stacked one on top of the other, form an AVA unit 300.
The isolation trench 230 has a wedge-shaped structure with a narrow top and a wide bottom.
The isolation groove 230 has a two-stage structure, the lower portion of the bottom-layer inverse foot 210 includes a holding edge 211 and a converging edge 212 sequentially connected from top to bottom, wherein the holding edge 211 extends in a direction perpendicular to the grounding substrate 220, and the converging edge 212 extends in a direction forming a non-zero included angle with the holding edge 211 and inwardly converges the lower portion of the bottom-layer inverse foot 210.
The input end of the first T-shaped microstrip power divider 121 further includes an SPP structure 124.
The groove depth of the SPP structure 124 is linearly deepened from the upper and lower ends to the middle, and is symmetrical left and right.
A first isosceles triangular notch 123 which is concave downwards is arranged at the middle connection position of the first T-shaped microstrip line power divider 121.
A second isosceles triangular notch 125 which is concave downwards is arranged at the middle connection position of the second T-shaped microstrip line power divider 122.
A first isosceles right-angle triangular notch 126 is formed at a connection between the output end of the first T-shaped microstrip power divider 121 and the input end of the second T-shaped microstrip power divider 122.
A second isosceles right-angled triangular notch 127 is arranged at the joint of the output end of the second T-shaped microstrip line power divider 122 and the input end of the top-layer foot bar 110.
The dielectric plate is a carrier for the top antenna board 100 and the bottom antenna board 200, and is well known to those skilled in the art, and is not shown in the drawings for clarity of illustration. But it can be unambiguously determined by a person skilled in the art that the dielectric plate is located between the top antenna plate 100 and the bottom antenna plate 200. And the basic structure and working principle of a single AVA can be understood with reference to CN113381183A and CN 112909527A. The material of the dielectric plate can be selected from Rogers 5880, the thickness is 0.787mm, the dielectric constant is 2.2, and the loss angle is 0.001.
The present invention performs simulation under the following table and the dimensional parameters shown in fig. 10 to fig. 12, but those skilled in the art can adjust the requirements of each parameter as required without creative work under the inventive concept provided by the present invention, and therefore the dimensional parameters of the following table cannot limit the protection scope of the present invention.
Figure BDA0003712703450000051
Wherein the content of the first and second substances,
l1 is the length of the grounded substrate 220, L2 is the length of the AVA unit 300, L3 is the length of the lower portion of the bottom anti-foot 210, L4 is the length of the upper anti-foot edge of the bottom anti-foot 210, and L5 is the distance of the retaining edge 211 from the grounded substrate 220; w1 is the width of the ground substrate 220 and also the overall width of the array antenna, W2 is the width of the AVA cell 300, W3 is the minimum pitch of the AVA cell 300, W4 is the top width of the top layer counter-foot 110, W5 is the maximum width of the isolation slot 230; w1 is the width of the second isosceles triangular notch 125, w2 is the width of the first isosceles triangular notch 123, w3 is the width of the output end of the first T-shaped microstrip line power divider 121, w4 is the width of the output end of the second T-shaped microstrip line power divider 122, ws is the groove width of the SPP structure, Wcut1 is the length of the right-angle side of the second isosceles right-angle triangular notch 127, and Wcut2 is the length of the right-angle side of the first isosceles right-angle triangular notch 126; h is the groove depth of the SPP structure, h1 is the depth of the second isosceles triangular notch 125, h2 is the depth of the first isosceles triangular notch 123, ds is the groove pitch of the SPP structure, and Δ h is the maximum variation in groove depth of the SPP structure.
Parameter simulation, and comparison of the effects and technical analysis of each functional component, as shown in fig. 13 to 21.
Discontinuity structures such as corners and T-shaped branches are arranged in the feed network, so that the added capacitance and inductance are often introduced, and loss is caused.
For corners, isosceles right triangle cuts can be used to reduce microstrip line losses. As can be seen from FIG. 13, compared with the corner notch structure without an isosceles right triangle, the reflection coefficient of the corner notch structure is generally reduced, and the-10 dB bandwidth is increased from the original 9GHz to 12.6GHz, which is improved by 3.6 GHz. The frequency band of 24GHz to 36GHz millimeter waves in 5G communication is covered, and meanwhile, the signal of the adjacent frequency band is obviously inhibited.
For a T-shaped bifurcation structure, the discontinuity of the structure and the reflection can be reduced by arranging an isosceles triangle notch at the T-shaped junction. As can be seen from FIG. 14, compared with the structure without the isosceles triangle notch, the-10 dB range of the structure with the isosceles triangle notch is extended from 24.6GHz-33.5GHz to 24.2GHz-36.8GHz, which increases the bandwidth of nearly 4GHz, and at the same time, s11 is greatly reduced. Therefore, the isosceles triangle notch arranged at the T-shaped junction can play a role in reducing electromagnetic reflection.
The dispersion curve of the SPP structure is intuitively reflected by the variation relationship in fig. 15, and the cut-off frequency of the dispersion curve gradually decreases with the increase of the groove depth h, thereby showing the filter characteristic of high-frequency cut-off. The wave number of the electromagnetic wave passing through the SPP structure will increase as the wave number in air increases. Since the groove structure of the SPP is similar to that of the metal cavity, when the depth of the groove is equal to a quarter wavelength of the electromagnetic wave, the metal cavity resonates with the electromagnetic wave to form a resonant cavity. The electromagnetic wave trapped in the resonant cavity is continuously reflected in the cavity to generate standing waves, so that the electromagnetic wave cannot be transmitted continuously. The frequency of the electromagnetic wave is the cut-off frequency of the SPP structure. Electromagnetic waves above this frequency will not be transmitted smoothly, and thus the SPP structure has the characteristics of a low pass filter. Using this property of the SPP structure can set the cut-off frequency at which the antenna operates, reducing high frequency noise interference from outside the operating band.
As can be seen from fig. 16, compared with the array antenna without the SPP structure, the frequency band of the array antenna with the SPP structure is obviously improved to a higher frequency band from 36GHz, which is obviously more than-10 dB, which means that most of electromagnetic waves are reflected to show the high-frequency suppression effect of the SPP structure; meanwhile, the frequency band before 36GHz is reduced to some extent, which means lower reflection, electromagnetic wave can pass through smoothly, and the low-frequency conduction and high-frequency cut-off characteristics of the SPP structure are reflected.
In order to ensure high isolation between the feeding ports of the AVA unit 300 and to ensure the symmetry and continuity of the structure of the feeding port and the structure of the antenna, the invention proposes to use a wedge-shaped isolation slot 230 to separate the AVA unit 300. The two-stage edge structure at the lower part of the two-sided AVA unit 300 divides the isolation slot 230 into a top-down holding stage and an isolation stage. The width of the notch of the keeping section is the same as the distance between the unit antennas and is kept unchanged, so that the consistency of the antenna structure and the feed structure is ensured; the width of the notch of the isolation section is linearly increased from top to bottom, and the coupling between the antenna feed ports can be reduced to the greatest extent. Fig. 17 and 18 are a comparison graph of S11 with and without a notch, respectively, and it can be seen from the comparison that the provision of the isolation slot 230 can increase the gain of the array antenna by about 0.5dB, and increase the-10 dB bandwidth of S11 from the original 6.6GHz to 11.6 GHz. It can be seen that the provision of the isolation slots 230 can reduce coupling between the AVA units 300 while increasing the gain and bandwidth of the array antenna.
Fig. 19 to 21 show simulated normalized E-plane and H-plane radiation directions of the array antenna at 26GHz, 30GHz, and 34GHz, respectively. It can be seen that, in the working frequency band, the radiation gain of the array antenna is concentrated in the required radiation direction, and the directivity is good. And the radiation side lobe level of the array antenna is reduced by-10 dB compared with the main lobe level, so that the concentrated radiation of energy is realized.
It will be apparent to those skilled in the art that various other changes and modifications may be made in the above-described embodiments and concepts and all such changes and modifications are intended to be within the scope of the appended claims.

Claims (9)

1. An array antenna applied to 5G communication is characterized by comprising a top layer antenna board (100) arranged at the top of a dielectric board and a bottom layer antenna board (200) arranged at the bottom of the dielectric board;
the lower part of the top layer antenna board (100) is provided with a feed network (120) divided into four parts, and the upper part is provided with four top layer reaction feet (110); four output ends of the feed network (120) are connected with the input ends of the top-layer reaction feet (110) in a one-to-one correspondence manner;
the feed network (120) comprises a first T-shaped microstrip line power divider (121) and two second T-shaped microstrip line power dividers (122); two output ends of the first T-shaped microstrip line power divider (121) are connected with the input end of the second T-shaped microstrip line power divider (122) in a one-to-one correspondence manner;
the lower part of the bottom layer antenna board (200) is provided with a horizontally extending grounding substrate (220), the upper part of the bottom layer antenna board is provided with four bottom layer feet (210), and the grounding substrate (220) is electrically connected with all the bottom layer feet (210); each bottom layer foot (210) is uniformly and correspondingly positioned below the top layer foot (110); an isolation groove (230) is arranged between the lower parts of the two adjacent bottom layer feet (210);
the top layer foot (110) and the bottom layer foot (210) which are overlapped form an AVA unit (300).
2. The array antenna applied to 5G communication according to claim 1, wherein the isolation slot (230) is of a wedge-shaped structure with a narrow top and a wide bottom.
3. The array antenna applied to 5G communication according to claim 2, wherein the isolation slot (230) has a two-segment structure, and the lower portion of the bottom-layer inverse foot (210) comprises a holding edge (211) and a converging edge (212) which are sequentially connected from top to bottom, wherein the holding edge (211) extends in a direction perpendicular to the grounding substrate (220), and the converging edge (212) extends in a direction forming a non-zero included angle with the holding edge (211) and inwardly converges the lower portion of the bottom-layer inverse foot (210).
4. The array antenna applied to 5G communication is characterized in that the input end of the first T-shaped microstrip line power divider (121) is also provided with an SPP structure (124).
5. The array antenna applied to 5G communication is characterized in that the groove depth of the SPP structure (124) is linearly increased from the upper end to the lower end to the middle, and is symmetrical left and right.
6. The array antenna applied to 5G communication according to claim 1, wherein a first isosceles triangular notch (123) which is concave downwards is arranged at a connection of the middle part of the first T-shaped microstrip power divider (121).
7. The array antenna applied to 5G communication according to claim 1, wherein a second isosceles triangle notch (125) which is concave downwards is arranged at the middle connection position of the second T-shaped microstrip line power divider (122).
8. The array antenna applied to 5G communication according to claim 1, wherein a first isosceles right triangle notch (126) is formed at a connection between the output end of the first T-shaped microstrip power divider (121) and the input end of the second T-shaped microstrip power divider (122).
9. The array antenna applied to 5G communication according to claim 1, wherein a second isosceles right triangle notch (127) is arranged at the joint of the output end of the second T-shaped microstrip power divider (122) and the input end of the top-layer antipodal leg (110).
CN202210729775.7A 2022-06-24 2022-06-24 Array antenna applied to 5G communication Active CN115020981B (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104659482A (en) * 2015-03-09 2015-05-27 西北工业大学 Vivaldi antenna array with symmetrical directional diagrams
CN107946765A (en) * 2017-11-21 2018-04-20 南京濠暻通讯科技有限公司 A kind of high-gain Vivaldi array antennas for loading director
CN108767407A (en) * 2018-07-20 2018-11-06 西安电子科技大学 Flexible power splitter
WO2020134474A1 (en) * 2018-12-28 2020-07-02 瑞声声学科技(深圳)有限公司 Mobile terminal
CN114498013A (en) * 2022-01-20 2022-05-13 哈尔滨工程大学 Four-arm helical antenna based on artificial surface plasmon element structure

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104659482A (en) * 2015-03-09 2015-05-27 西北工业大学 Vivaldi antenna array with symmetrical directional diagrams
CN107946765A (en) * 2017-11-21 2018-04-20 南京濠暻通讯科技有限公司 A kind of high-gain Vivaldi array antennas for loading director
CN108767407A (en) * 2018-07-20 2018-11-06 西安电子科技大学 Flexible power splitter
WO2020134474A1 (en) * 2018-12-28 2020-07-02 瑞声声学科技(深圳)有限公司 Mobile terminal
CN114498013A (en) * 2022-01-20 2022-05-13 哈尔滨工程大学 Four-arm helical antenna based on artificial surface plasmon element structure

Non-Patent Citations (1)

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Title
SHUANGSHUANG ZHU等: "A Compact Gain-Enhanced Vivaldi Antenna Array With Suppressed Mutual Coupling for 5G mmWave Application", 《IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS》 *

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