CN114039208B - Multiband slot coupling antenna - Google Patents
Multiband slot coupling antenna Download PDFInfo
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- CN114039208B CN114039208B CN202111387594.2A CN202111387594A CN114039208B CN 114039208 B CN114039208 B CN 114039208B CN 202111387594 A CN202111387594 A CN 202111387594A CN 114039208 B CN114039208 B CN 114039208B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
- H01Q9/04—Resonant antennas
- H01Q9/0407—Substantially flat resonant element parallel to ground plane, e.g. patch antenna
- H01Q9/0414—Substantially flat resonant element parallel to ground plane, e.g. patch antenna in a stacked or folded configuration
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/002—Protection against seismic waves, thermal radiation or other disturbances, e.g. nuclear explosion; Arrangements for improving the power handling capability of an antenna
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
- H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
- H01Q1/241—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
-
- 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
- H01Q5/10—Resonant antennas
-
- 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
- H01Q5/20—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements characterised by the operating wavebands
-
- 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
- H01Q5/50—Feeding or matching arrangements for broad-band or multi-band operation
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
- H01Q9/04—Resonant antennas
- H01Q9/0407—Substantially flat resonant element parallel to ground plane, e.g. patch antenna
- H01Q9/045—Substantially flat resonant element parallel to ground plane, e.g. patch antenna with particular feeding means
- H01Q9/0457—Substantially flat resonant element parallel to ground plane, e.g. patch antenna with particular feeding means electromagnetically coupled to the feed line
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Waveguide Aerials (AREA)
Abstract
The invention discloses a multi-band slot coupling antenna which comprises an upper layer feed substrate and a lower layer dielectric plate which are arranged in a laminated mode. The upper surface layer of the upper layer feed substrate is etched with a microstrip feed line and a rectangular radiation patch, and the lower surface layer of the lower layer dielectric plate is provided with a circular radiation patch; a grounding surface arranged right above the circular radiation patch is arranged between the upper layer feed substrate and the lower layer dielectric plate, and copper sheets are paved on the grounding surface; the grounding surface is provided with a cross-shaped coupling groove; after feeding the feed port, the rectangular radiation patch is fed by a microstrip feed line, and energy is coupled to the circular radiation patch through a slot opening. The invention optimizes the feeding performance and the radiation performance of the microstrip antenna by utilizing the feeding mode of slot coupling, so that the antenna is miniaturized and works in multiple frequency bands, and the gain performance is greatly improved.
Description
Technical Field
The invention belongs to the technical field of wireless antennas, and relates to a multi-band slot coupling antenna.
Background
With the development of technology, modern portable mobile terminal products become necessities in life, and antennas are also subjected to multiple upgrades as bridges for receiving and transmitting signals. In order to meet the needs of life, various multi-band antennas are designed and produced.
In the prior art, in order to meet the requirements of broadband, multiband and antenna miniaturization, a common single patch microstrip antenna is difficult to achieve multiband. The microstrip antenna array technology is adopted, so that multiple frequency bands can be achieved, the bandwidth is greatly improved, but the antenna array structure is relatively complex, and mass processing production is not facilitated. In order to make the common microstrip antenna have the advantages of multiple frequency bands, simple structure and being beneficial to mass processing, the design structure of the microstrip antenna becomes more important.
Generally, conventional microstrip antennas generally employ two direct contact feeding modes, namely a transmission line and a coaxial line. This has the advantage of simplicity, which has the disadvantage that a compromise has to be made between bandwidth and feed radiation, while increasing the substrate thickness can increase the bandwidth. But the resulting feed radiation and surface wave energy are not applicable. The novel feeding mode is contactless coupling feeding. Such feeding typically requires that the microstrip antenna be constructed as a dual layer (or multi-layer) structure. The common aperture coupling feed is to separate two parallel substrates with a ground plate, and the microstrip line on the bottom substrate is coupled to the patch of the upper substrate through the small aperture on the ground plate. The coupled feed allows feeding on one thin substrate with a high dielectric constant, while the antenna is mounted on the other thick substrate with a low dielectric constant. Therefore, the feeding performance and the radiation performance of the microstrip antenna can be optimized respectively by adopting the double-layer structure coupling feeding. The structure can reduce the influence of parasitic radiation of the feed source on the antenna pattern and polarization purity. However, simply using aperture-coupled feeds does not allow the antenna to operate over multiple frequency bands.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a multi-band slot coupling antenna, which optimizes the feeding performance and the radiation performance of the microstrip antenna by using a slot coupling feeding mode, so that the antenna is miniaturized, works in multiple bands and greatly improves the gain performance.
In order to solve the technical problems, the invention adopts the following technical scheme.
The invention relates to a multi-band slot coupling antenna, which comprises two layers of dielectric substrates, namely an upper layer feed substrate and a lower layer dielectric plate which are overlapped.
The upper surface layer of the upper layer feed substrate is etched with a microstrip feed line and a rectangular radiation patch, and the lower surface layer of the lower layer dielectric plate is provided with a circular radiation patch; a grounding surface arranged right above the circular radiation patch is arranged between the upper layer feed substrate and the lower layer dielectric plate, and copper sheets are paved on the grounding surface; the grounding surface is provided with a cross-shaped coupling groove; after feeding the feed port, the rectangular radiation patch is fed by a microstrip feed line, and energy is coupled to the circular radiation patch through a slot opening.
Preferably, the upper layer feeding substrate 1 adopts an FR4 feeding substrate with a dielectric constant of 4.9 and a thickness of 1mm.
Further, the rectangular radiation patch 3 is placed along the symmetry axis of the upper surface layer of the upper layer feeding substrate 1, and is 23mm away from the edge width of the upper surface layer of the upper layer feeding substrate 1, and is connected with the microstrip feeder 4.
Further, the microstrip feeder 4 is placed along the symmetry axis of the surface layer width of the upper layer feeder substrate 1, and the length is set to be 23mm; the offset angle between the microstrip feeder 4 and the two arms of the cross coupling slot 5 below is 45 degrees.
Preferably, the width of the slit opening 7 is w2=1mm.
Preferably, the medium of the lower medium plate 2 is made of foam materials.
Preferably, the two arms of the cross coupling slot 5 are not equal in length, and the ratio of the lengths is 1:1.17.
the antenna has four resonance points of 3.2GHz, 4.7GHz, 5.9GHz and 6.9GHz respectively.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. the invention realizes two feeding technologies of microstrip line side feeding and slot coupling feeding by using only one feeding port. Compared with coaxial line or microstrip line feeding, aperture coupling feeding has some remarkable advantages: the feed position does not need welding spots, and the adjustable parameters for impedance matching are more; the substrates adopted by the feed structure and the radiation patch are separated from each other, and different dielectric materials and dielectric thicknesses can be independently selected to meet the requirements of the feed structure on the radiation patch; by adjusting the length of the coupling slot or the length of the open end of the microstrip feed line, impedance matching with the radiating patch can be achieved more easily than in other feeding modes.
2. The antenna can work in four frequency bands, and the common single patch microstrip antenna is difficult to work in multiple frequency bands.
3. The antenna of the invention can be used for low-frequency wireless communication, has high gain and low profile characteristics, and is more suitable for multi-terminal communication environment.
4. The antenna technology is the key of effective emission of radio waves, and has wide market demands and economic benefits. The multi-band antenna designed by the invention has the advantages of small volume, simple structure, light weight, low cost, low profile characteristic, convenient processing and easy installation, conforms to the development requirement of wireless communication technology, and has better economic benefit.
Drawings
Fig. 1 is a schematic structural diagram of a multiband slot-coupled antenna according to the present invention.
FIG. 2 is a schematic illustration of dimensioning an embodiment of the invention. Wherein L1 and L2 are the length and the width of the rectangular radiation patch respectively, L3 and L4 are the length and the width of the dielectric plate respectively, R1 is the radius of the circular radiation patch, W1 is the width of the microstrip feeder line, W2 is the width of the slot opening, W3 and W4 are the double-arm lengths of the cross coupling slot, h1 is the thickness of the lower dielectric plate, and h2 is the thickness of the upper feed substrate.
Fig. 3 is a schematic diagram of preferred dimensions of an embodiment of the present invention.
Fig. 4 is a return loss plot of an embodiment of the present invention.
FIG. 5 is a graph of gain results of a multiband slot coupled antenna according to the present invention at a corresponding frequency point of 3.2 GHz;
FIG. 6 is a graph showing the gain result of a multiband slot-coupled antenna according to the present invention at a corresponding frequency point of 4.7 GHz;
FIG. 7 is a graph showing the gain results of a multiband slot-coupled antenna according to the present invention at 5.9GHz corresponding to the frequency point;
FIG. 8 is a graph of gain results of a multiband slot coupled antenna according to the present invention at 6.9GHz corresponding to a frequency point;
wherein 1 is upper layer feed substrate, 2 is lower dielectric plate, 3 is rectangular radiation patch, 4 is microstrip feeder, 5 is feed substrate, 6 is cross coupling groove, 7 is a ground plane opening out of cross coupling groove 6, 8 is slot opening, 9 is air dielectric layer, 10 is circular radiation patch, 11 is feed port.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1, the multiband slot-coupled antenna of the present invention includes two dielectric substrates, namely an upper feed substrate 1 and a lower dielectric substrate 2, which are stacked.
The structure from top to bottom is as follows: the upper surface layer of the upper layer feed substrate 1 is etched with a microstrip feed line 4 and a rectangular radiation patch 3, and a circular radiation patch 9 is placed on the lower surface layer of the lower layer dielectric plate 2; a copper sheet is paved on the grounding surface 6 between the two layers of dielectric plates; a grounding surface 6 is arranged right above the circular radiation patch 9, and a cross-shaped coupling groove 5 is formed in the grounding surface; after feeding the feed port 10, the rectangular radiating patch 3 is fed via the microstrip feed line 4, and energy is coupled to the circular radiating patch 9 via a slot opening 7.
The upper layer feeding substrate 1 is an FR4 feeding substrate with a dielectric constant of 4.9 and a thickness of 1mm.
The rectangular radiation patch 3 is arranged on the upper surface layer of the upper layer feeding substrate 1, and the square radiation patch is arranged along the symmetry axis of the upper surface layer, is 23mm away from the edge width of the upper surface layer and is connected with the microstrip feeder 4.
The microstrip feeder 4 is etched on the upper surface layer of the upper layer feeding substrate 1, microstrip line feeding is adopted, the offset angle between the microstrip feeder and two arms of the lower cross-shaped coupling groove 5 is 45 degrees, the microstrip feeder is placed along the symmetry axis of the upper layer feeding substrate 1, and the length is set to be 23mm.
And a ground plane 6 provided with a cross-shaped coupling groove 5, wherein the ground plane 6 is positioned above the air medium layer 8, and is arranged between two layers of medium plates, and is paved with copper sheets.
The width of the slit opening 7 is w2=1mm, and the value can be flexibly adjusted in practical application, so that W2 is required to be far smaller than W3 and W4.
The air medium layer 8, the air medium layer 8 is the medium of the lower medium plate 2, and the actual situation is replaced by foam materials.
The cross coupling groove 5, the double arms of the cross coupling groove 5 are not equal in length, the length of W3 is 14mm, the length of W4 is 12mm, and the ratio of the lengths is about 1.17.
The circular radiation patch 9 is positioned on the lower surface layer of the lower dielectric plate 2.
A feed port 10, said feed port 10 feeding the rectangular radiating patch 3 via a microstrip feed line 4, coupling energy to the circular radiating patch 9 via a slot.
In this embodiment, the radiation patch is a circular patch 9 with a radius r1=12.88 mm, and an air dielectric layer 8 with a thickness of 2mm is disposed above the patch, and in practical application, in consideration of the influence of the firmness and impact resistance of the antenna structure, materials with similar dielectric constants such as foam may be filled.
Above the air dielectric layer 8 is a ground plane 6 with a cross-shaped coupling slot 5. The cross coupling groove 5 has two arms of unequal length, a length W3 of 14mm, a length W4 of 12mm, and a length ratio of about 1.17. The width W2 = 1mm of the slit 7 can be flexibly adjusted in practical application, and W2 is required to be far smaller than W3 and W4.
In this embodiment, the dielectric constant is 4.9 above the ground plane 6, the thickness is 1mm of the FR4 feeding substrate 1, the upper surface layer of the feeding substrate 1 is a microstrip feeder 4, and the width w1=2mm of the microstrip feeder is used to ensure that the input impedance of the feeder is about 50 ohms.
In this embodiment, the offset angle between the microstrip feed line 4 and the two arms of the cross coupling slot 5 is 45 degrees. After multiple experimental simulation modifications, the size of the rectangular radiation patch 3 fed by the microstrip feeder line at the uppermost layer is 26mm long and 20mm wide.
In the present invention, the cross slot 7 is equivalent to two individual slots perpendicular to each other, and the antenna is equivalent to two linear polarization antennas perpendicular to each other, so that the length of the cross slot 7 is appropriately adjusted to obtain ideal impedance matching. The unequal slot openings 7 can excite two similar resonant modes, which need to be similar in amplitude and need to be 90 degrees out of phase.
In general, a microstrip patch antenna has a high quality factor Q, and in order to effectively reduce the quality factor Q of the microstrip antenna, a medium having a low dielectric constant and a thick thickness must be selected, so for the feeding substrate 1, a thin substrate is selected to effectively reduce spurious radiation from the feeding line. In the present invention, since the aperture coupling feeding method is used, it is possible to select each of the feeding methods according to different needs. However, the dielectric thickness of the radiating substrate should not be too thick, otherwise unnecessary higher order modes and spurious emissions are easily excited at the surface of the patch antenna, and typically take values not exceeding 0.052λ.
In the invention, the width of the coupling slot 7 has small influence on the overall performance of the antenna, and the value of the width can be used for adjusting the impedance matching of the antenna. In general, when the thickness of the antenna radiation substrate is increased, it is also necessary to increase the width of the slot 7 to enhance the coupling degree. In the present invention, the antenna is insensitive to changes in its value. The width W2 of the slit 7 should be smaller than one tenth of the lengths W3 and W4 of the slit 7. In the application, the method can be specifically selected according to actual conditions, and is usually 1mm and convenient to manufacture.
The invention uses the characteristic that the feed structure and the substrate of the radiation patch are separated from each other, and adopts the radiation substrate with lower dielectric constant and larger thickness to reduce the Q value of the antenna. In addition, the ground plate can also shield parasitic radiation from the feeder line, and interference to the radiation pattern of the upper half part of the antenna is avoided.
The antenna provided by the invention has four resonance points, namely 3.2GHz, 4.7GHz, 5.9GHz and 6.9GHz, S11 at the four resonance points is less than-15 dB, port reflection energy is less than 3.2%, and the antenna has good matching performance. The far field pattern for the four frequency points is as follows, with a maximum gain of 1.6dB at 3.2GHz, a gain of 2.3dB at 4.7GHz, a gain of 8.9dB at 5.9GHz, and a gain of 2.6dB at 6.9GHz.
Claims (1)
1. The multi-band slot coupling antenna is characterized by comprising two layers of dielectric substrates, namely an upper layer feed substrate (1) and a lower layer dielectric plate (2) which are overlapped;
the upper surface layer of the upper layer feed substrate (1) is etched with a microstrip feed line (4) and a rectangular radiation patch (3), and the lower surface layer of the lower layer dielectric plate (2) is provided with a circular radiation patch (9); a grounding surface (6) arranged right above the circular radiation patch (9) is arranged between the upper layer feeding substrate (1) and the lower layer dielectric plate (2), and copper sheets are paved on the grounding surface; the grounding surface (6) is provided with a cross-shaped coupling groove (5); after feeding the feed port (10), feeding the rectangular radiation patch (3) through the microstrip feed line (4), and coupling energy to the circular radiation patch (9) through a slot opening (7);
the upper layer feeding substrate (1) adopts an FR4 feeding substrate with a dielectric constant of 4.9 and a thickness of 1mm;
the rectangular radiation patch (3) is placed along a symmetry axis with the upper surface layer of the upper layer feeding substrate (1) and is 23mm away from the edge width of the upper surface layer of the upper layer feeding substrate (1) and connected with the microstrip feeder line (4);
the microstrip feeder line (4) is arranged along a symmetry axis of the surface layer width of the upper layer feeder substrate (1) and is set to be 23mm in length; the offset angle between the microstrip feeder line (4) and two arms of the cross coupling groove (5) below is 45 degrees;
the width of the gap opening (7) is W2=1mm;
the medium of the lower medium plate (2) is made of foam materials;
the two arms of the cross coupling groove (5) are not equal in length, and the length ratio is 1:1.17;
the antenna is provided with four resonance points, namely 3.2GHz, 4.7GHz, 5.9GHz and 6.9GHz;
the radius R1=12.88 mm of the circular radiation patch (9), and an air medium layer (8) with the thickness of 2mm is arranged above the circular radiation patch (9).
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111387594.2A CN114039208B (en) | 2021-11-22 | 2021-11-22 | Multiband slot coupling antenna |
| PCT/CN2022/126402 WO2023088026A1 (en) | 2021-11-22 | 2022-10-20 | Multi-band slot-coupled antenna |
| KR1020247012137A KR20240065276A (en) | 2021-11-22 | 2022-10-20 | Multi-band slot-combined antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111387594.2A CN114039208B (en) | 2021-11-22 | 2021-11-22 | Multiband slot coupling antenna |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114039208A CN114039208A (en) | 2022-02-11 |
| CN114039208B true CN114039208B (en) | 2023-10-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111387594.2A Active CN114039208B (en) | 2021-11-22 | 2021-11-22 | Multiband slot coupling antenna |
Country Status (3)
| Country | Link |
|---|---|
| KR (1) | KR20240065276A (en) |
| CN (1) | CN114039208B (en) |
| WO (1) | WO2023088026A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114039208B (en) * | 2021-11-22 | 2023-10-03 | 江苏科技大学 | Multiband slot coupling antenna |
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| JPH03227103A (en) * | 1990-02-01 | 1991-10-08 | Nippon Hoso Kyokai <Nhk> | Microstrip array antenna |
| JPH06232626A (en) * | 1993-02-02 | 1994-08-19 | A T R Koudenpa Tsushin Kenkyusho:Kk | Slot coupling type microstrip antenna |
| CN101931122A (en) * | 2010-08-27 | 2010-12-29 | 电子科技大学 | C/X dual-band microstrip antenna |
| CN103606745A (en) * | 2013-11-06 | 2014-02-26 | 航天恒星科技有限公司 | Low section compact dual-band dual-polarization common aperture microstrip antenna |
| CN104577316A (en) * | 2014-12-30 | 2015-04-29 | 中国科学院上海微系统与信息技术研究所 | Vertical coupled feeding structure applied to millimeter-wave microstrip antenna |
| CN207690996U (en) * | 2018-01-10 | 2018-08-03 | 东莞市钧鹏电子科技有限公司 | A kind of multiband Multi-polarization microstrip patch antenna |
| CN109449583A (en) * | 2018-10-31 | 2019-03-08 | 安徽四创电子股份有限公司 | A kind of 5G Millimeter Wave Phased Array Antenna |
| CN111864379A (en) * | 2020-08-25 | 2020-10-30 | 陕西天鼎无线技术股份有限公司 | Slot-coupled broadband single-feed circularly-polarized microstrip antenna |
| CN113629398A (en) * | 2021-10-12 | 2021-11-09 | 深圳大学 | Broadband coupling patch antenna with consistent radiation pattern and improved gain |
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| GB9220414D0 (en) * | 1992-09-28 | 1992-11-11 | Pilkington Plc | Patch antenna assembly |
| KR20040077052A (en) * | 2003-02-27 | 2004-09-04 | 한국전자통신연구원 | Wideband slot antenna and slot array antenna using the same |
| DE102005010894B4 (en) * | 2005-03-09 | 2008-06-12 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Planar multiband antenna |
| CN101154768B (en) * | 2006-09-29 | 2011-12-07 | 智邦科技股份有限公司 | Hand-hold communication equipment with coupling slot antenna module |
| CN104300203A (en) * | 2013-07-17 | 2015-01-21 | 电子科技大学 | Circularly polarized microstrip patch antenna with slot radiation fed by L-waveband microstrip |
| CN110380202B (en) * | 2019-07-05 | 2021-06-08 | 上海安费诺永亿通讯电子有限公司 | Low-cost low-profile broadband Massive MIMO antenna unit |
| CN114039208B (en) * | 2021-11-22 | 2023-10-03 | 江苏科技大学 | Multiband slot coupling antenna |
-
2021
- 2021-11-22 CN CN202111387594.2A patent/CN114039208B/en active Active
-
2022
- 2022-10-20 WO PCT/CN2022/126402 patent/WO2023088026A1/en unknown
- 2022-10-20 KR KR1020247012137A patent/KR20240065276A/en unknown
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03227103A (en) * | 1990-02-01 | 1991-10-08 | Nippon Hoso Kyokai <Nhk> | Microstrip array antenna |
| JPH06232626A (en) * | 1993-02-02 | 1994-08-19 | A T R Koudenpa Tsushin Kenkyusho:Kk | Slot coupling type microstrip antenna |
| CN101931122A (en) * | 2010-08-27 | 2010-12-29 | 电子科技大学 | C/X dual-band microstrip antenna |
| CN103606745A (en) * | 2013-11-06 | 2014-02-26 | 航天恒星科技有限公司 | Low section compact dual-band dual-polarization common aperture microstrip antenna |
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| CN109449583A (en) * | 2018-10-31 | 2019-03-08 | 安徽四创电子股份有限公司 | A kind of 5G Millimeter Wave Phased Array Antenna |
| CN111864379A (en) * | 2020-08-25 | 2020-10-30 | 陕西天鼎无线技术股份有限公司 | Slot-coupled broadband single-feed circularly-polarized microstrip antenna |
| CN113629398A (en) * | 2021-10-12 | 2021-11-09 | 深圳大学 | Broadband coupling patch antenna with consistent radiation pattern and improved gain |
Also Published As
| Publication number | Publication date |
|---|---|
| KR20240065276A (en) | 2024-05-14 |
| WO2023088026A1 (en) | 2023-05-25 |
| CN114039208A (en) | 2022-02-11 |
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