CN113097750B - Reconfigurable holographic impedance modulation surface antenna based on laminated structure and liquid crystal - Google Patents
Reconfigurable holographic impedance modulation surface antenna based on laminated structure and liquid crystal Download PDFInfo
- Publication number
- CN113097750B CN113097750B CN202110399294.XA CN202110399294A CN113097750B CN 113097750 B CN113097750 B CN 113097750B CN 202110399294 A CN202110399294 A CN 202110399294A CN 113097750 B CN113097750 B CN 113097750B
- Authority
- CN
- China
- Prior art keywords
- liquid crystal
- metal
- laminated structure
- antenna based
- crystal layer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q25/00—Antennas or antenna systems providing at least two radiating patterns
-
- 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
-
- 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
- H01Q13/106—Microstrip slot antennas
-
- 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
- H01Q3/24—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 orientation by switching energy from one active radiating element to another, e.g. for beam switching
Landscapes
- Waveguide Aerials (AREA)
Abstract
The invention discloses a reconfigurable holographic impedance modulation surface antenna based on a laminated structure and liquid crystal, which comprises a medium frame, wherein a metal bottom plate is arranged below the medium frame; a groove body penetrating through the upper surface and the lower surface of the medium frame is arranged on the medium frame, a liquid crystal layer is arranged in the groove body, and a medium plate is arranged on the liquid crystal layer; the upper surface and the lower surface of the dielectric slab are provided with 8 stacked structure periodic gap units which are sequentially arranged, and each stacked structure periodic gap unit comprises 4 metal through holes which penetrate through the dielectric slab, 7 metal patches and 2 longitudinal metal strips which are located on the bottom surface of the dielectric slab. The invention adopts a surface impedance extraction method to obtain the periodic gap unit of the laminated structure, then adds a liquid crystal layer in a medium frame, and carries out voltage bias regulation and control on the liquid crystal layer to form the reconfigurable periodic gap unit of the laminated structure, thereby realizing the reconfiguration of a directional diagram.
Description
Technical Field
The invention relates to the field of antennas, in particular to a reconfigurable holographic impedance modulation surface antenna based on a laminated structure and liquid crystal.
Background
The antenna is an important component of a system for wireless communication, sensing, detection, identification and the like, mainly realizes the transmission and the reception of electromagnetic waves, and the working performance and the physical characteristics of the antenna influence the performance of the whole system. In recent years, holographic technology is widely applied to the field of microwave antennas, and novel antennas such as holographic super-surface antennas and holographic impedance modulation antennas appear. The holographic antenna has the characteristics of low section, low profile, small volume and the like, so that the holographic antenna can be mounted on the surfaces of various objects in a very concealed mode to realize a coplanar structure. Moreover, the holographic antenna has a simple structure, a simple manufacturing process and convenience in processing, and does not need a complex feed structure, so that the complexity of an antenna feed network in actual engineering can be reduced to a great extent. Meanwhile, the holographic antenna is mainly made of a dielectric material, the weight of the holographic antenna is far less than that of a metal material, and the holographic antenna is suitable for conformal application of an aircraft skin structure. In addition, based on the working mechanism of the holographic antenna, the electromagnetic wave can be guided to propagate on the surface of the holographic antenna, so that the scattering sectional area of the radar is reduced, and electromagnetic stealth is realized. Therefore, the method has good application prospect in practical engineering. However, the conventional holographic antenna has a working mechanism that the reference wave is used for irradiating the interference pattern to invert the target beam, and for the specified working frequency, the radiation pattern of the holographic antenna is lack of adjustability, which is not beneficial to practical engineering application.
Disclosure of Invention
Aiming at the defects in the prior art, the reconfigurable holographic impedance modulation surface antenna based on the laminated structure and the liquid crystal solves the problem that the directional diagram of the traditional holographic antenna is lack of adjustability.
In order to achieve the purpose of the invention, the invention adopts the technical scheme that:
the reconfigurable holographic impedance modulation surface antenna based on the laminated structure and the liquid crystal comprises a medium frame, wherein a metal bottom plate is arranged below the medium frame; a groove body penetrating through the upper surface and the lower surface of the medium frame is arranged on the medium frame, a liquid crystal layer is arranged in the groove body, and a medium plate is arranged on the liquid crystal layer;
the upper surface and the lower surface of the dielectric slab are respectively provided with 8 laminated structure periodic gap units which are sequentially arranged, and each laminated structure periodic gap unit comprises 4 metal through holes which penetrate through the dielectric slab, 7 metal patches and 2 longitudinal metal strips which are positioned on the bottom surface of the dielectric slab;
in the same periodic gap unit with the laminated structure, 7 metal patches are sequentially arranged, and each metal patch is provided with an independent gap; the 4 metal through holes are uniformly divided into 2 groups which are symmetrically arranged on the upper side and the lower side of the 7 metal patches in the vertical direction, and 1 metal strip is connected between each group of metal through holes;
the upper surface of the medium frame is provided with a microstrip line which is connected with the first laminated structure periodic slot unit on the same side of the microstrip line.
Further, the thickness of the liquid crystal layer is 4 times the thickness of the dielectric plate.
Furthermore, the microstrip line is an exponential gradient transition microstrip line.
Further, the width of the metal strip is 1 mm.
Further, the thickness of the dielectric frame is 2.5 mm.
Further, the thickness of the liquid crystal layer was 2mm, and the thickness of the dielectric plate was 0.5 mm.
Further, the dielectric constant of the liquid crystal in the liquid crystal layer is 2.74-5.44.
Further, in the same lamination structure periodic slit unit, 2 longitudinal metal strips are respectively positioned at one quarter and three quarters of the length of the lamination structure periodic slit unit.
The invention has the beneficial effects that:
1. the invention adopts a surface impedance extraction method to obtain periodic gap structure parameters, then liquid crystal layers are added in the medium frame, and voltage bias regulation and control are carried out on the liquid crystal layers, so that the reconstruction of a directional diagram is realized.
2. According to the invention, 2 metal strips are uniformly added below the dielectric plate to form the periodic slot unit with the laminated structure, so that the radiation efficiency of the antenna can be improved.
3. The one-dimensional antenna obtained based on the laminated structure periodic slot unit can obtain high gain.
Drawings
Fig. 1 is an exploded view of the antenna;
FIG. 2 is a schematic structural diagram of a single stacked-structure periodic slot unit on a dielectric slab;
FIG. 3 is a return loss diagram of the antenna under different bias conditions;
FIG. 4 is a schematic diagram of the E-plane radiation pattern of the antenna at a fixed frequency of 12 GHz;
fig. 5 is a schematic diagram of the maximum gain of the antenna along with the frequency distribution under different bias conditions.
Wherein: 1. a laminated structure periodic slit unit; 2. a dielectric plate; 3. a metal via; 4. a liquid crystal layer; 5. a metal strip; 6. a media frame; 7. a metal base plate; 8. a microstrip line; 9. a metal patch; 10. a gap.
Detailed Description
The following description of the embodiments of the present invention is provided to facilitate the understanding of the present invention by those skilled in the art, but it should be understood that the present invention is not limited to the scope of the embodiments, and it will be apparent to those skilled in the art that various changes may be made without departing from the spirit and scope of the invention as defined and defined in the appended claims, and all matters produced by the invention using the inventive concept are protected.
As shown in fig. 1 and fig. 2, the reconfigurable holographic impedance modulation surface antenna based on the laminated structure and the liquid crystal comprises a medium frame 6, wherein a metal bottom plate 7 is arranged below the medium frame 6; a groove body penetrating through the upper surface and the lower surface of the medium frame 6 is arranged on the medium frame 6, a liquid crystal layer 4 is arranged in the groove body, and a medium plate 2 is arranged on the liquid crystal layer 4;
the upper surface and the lower surface of the dielectric slab 2 are respectively provided with 8 laminated structure periodic gap units 1 which are sequentially arranged, and each laminated structure periodic gap unit 1 comprises 4 metal through holes 3 which penetrate through the dielectric slab 2, 7 metal patches 9 and 2 metal strips 5 which are longitudinal and are positioned on the bottom surface of the dielectric slab 2;
in the same periodic gap unit 1 with the laminated structure, 7 metal patches 9 are sequentially arranged, and each metal patch 9 is provided with an independent gap 10; the 4 metal through holes 3 are uniformly divided into 2 groups which are symmetrically arranged at the upper side and the lower side of the 7 metal patches 9, and 1 metal strip 5 is connected between each group of metal through holes 3; 2 longitudinal metal strips 5 are respectively positioned at one quarter and three quarters of the length of the periodic slit unit 1 of the laminated structure; the tail ends of the metal strips 5 extend to the upper surface of the dielectric plate 2 through the metal through holes 3 to form a laminated structure with the upper-layer metal patch, and the structure can prevent the energy of surface waves from being dissipated in the liquid crystal layer 4 in the transmission process and improve the radiation efficiency of the antenna.
The upper surface of the dielectric frame 6 is provided with a microstrip line 8, and the microstrip line 8 is connected with the first laminated structure periodic slot unit 1 on the same side.
The thickness of the liquid crystal layer 4 is 4 times of the thickness of the dielectric plate 2, and preferably the thickness of the liquid crystal layer 4 is 2mm, the thickness of the dielectric plate 2 is 0.5mm, and the thickness of the dielectric frame 6 is 2.5 mm. The microstrip line 8 is an exponential transition microstrip line. The width of the metal strip 5 is 1 mm. The liquid crystal in the liquid crystal layer 4 has a dielectric constant of 2.74 to 5.44. In an embodiment of the present invention, the 7 independent slots 10 are g1, g2, g3, g4, g3, g2, and g1 from left to right, respectively, and by optimizing the slot widths, the widths of the metal strips 5 and the surface impedances of the slot structures are controlled to appropriate values, so that slot structure parameters that optimize the antenna performance at the center frequency of 12GHz can be obtained. Before the antenna is designed, the basic resonance unit is determined. The periodic metal gap structure shown in fig. 2 is selected as a basic unit, and then surface impedance extraction is performed on each gap unit in the structure, where the surface impedance can be expressed as:
wherein c is the electromagnetic wave vacuum velocity, omega is the eigenfrequency, d0Is a single gap length, Z0Theta is the surface wave propagating a distance d on a single slot structure unit for free space wave impedance0The resulting phase difference. Tuning is carried out by using structural parameters of the gaps g1, g2, g3 and g4, and modeling simulation is carried out on the antenna by adopting full-wave simulation software to obtain the structural parameters of the gaps which enable the antenna performance index to be the best under a fixed condition.
In the specific implementation process, a periodic gap structure is designed by adopting a surface impedance extraction method, then 2 metal strips 5 are uniformly added below a dielectric plate 2, the tail ends of the metal strips 5 extend to the upper surface of the dielectric plate 2 through metal through holes 3, the two metal strips containing metallized blind holes and the gap structure metal strips on the upper surface form perturbation, the surface wave loss is reduced in a liquid crystal layer 4, and the radiation efficiency of the antenna is improved. And finally, loading a liquid crystal layer 4 to form a laminated structure reconfigurable periodic slit unit. And bias voltage is applied through the metal through holes 3 and the metal strips 5, the liquid crystal particles are arranged in an anisotropic order under a normal state, and the dielectric constant is between the maximum and the minimum. When a certain DC bias voltage is applied to the liquid crystal, the vertical or parallel orientation of the liquid crystal particles is realized, thereby changing the dielectric constant of the liquid crystal particles. The metal through hole 3 extending the upper surface is connected with a metal sheet for carrying out direct current voltage bias regulation and control on the liquid crystal, and the directional diagram can be reconstructed.
The input microstrip line 8 and the laminated structure periodic gap unit 1 are in impedance matching by adopting an exponential type gradient line, 8 periodic gap structure units are fixed at the center by a medium frame 6 with a fixed dielectric constant, the thickness of the medium frame 6 is equal to the total thickness of the medium plate 2 and the liquid crystal layer 4, and the medium frame 6 is arranged below the left input microstrip line 8.
As shown in FIG. 3, under different bias conditions, the return loss of the antenna is better than 15dB in the frequency range of 10.8-13.3 GHz. As shown in fig. 4, the E-plane radiation pattern of the present antenna can realize a continuous deflection of 36 ° at a fixed frequency of 12GHz, and exhibits a good reconfigurable characteristic. Under different bias voltages, the gain of the antenna at the fixed frequency of 12GHz is greater than 14.5dB, and the gain jitter is less than 1.3 dB. As shown in FIG. 5, under different bias conditions, the maximum gain of the antenna in the frequency range of 10.3-13.1GHz is 13.8-15.7 dBi. By combining the figures 3 and 5, the center frequency of the antenna is 12GHz, the passband range is 11-13 GHz, and the relative bandwidth is 16.7%.
In summary, the invention adopts a surface impedance extraction method to obtain the periodic gap unit 1 with the laminated structure, then adds the liquid crystal layer 4 in the medium frame, and performs voltage bias regulation and control on the liquid crystal layer 4 to form the reconfigurable periodic gap unit with the laminated structure, thereby realizing the reconfiguration of the directional diagram.
Claims (8)
1. A reconfigurable holographic impedance modulation surface antenna based on a laminated structure and liquid crystal is characterized by comprising a medium frame (6), wherein a metal bottom plate (7) is arranged below the medium frame (6); a groove body penetrating through the upper surface and the lower surface of the medium frame (6) is arranged on the medium frame, a liquid crystal layer (4) is arranged in the groove body, and a medium plate (2) is arranged on the liquid crystal layer (4);
the upper surface and the lower surface of the dielectric slab (2) are respectively provided with 8 laminated structure periodic gap units (1) which are sequentially arranged, and each laminated structure periodic gap unit (1) comprises 4 metal through holes (3) which penetrate through the dielectric slab (2), 7 metal patches (9) and 2 longitudinal metal strips (5) which are positioned on the bottom surface of the dielectric slab (2);
in the same periodic gap unit (1) with a laminated structure, 7 metal patches (9) are sequentially arranged, and each metal patch (9) is provided with an independent and longitudinal gap (10); the 4 metal through holes (3) are uniformly divided into 2 groups which are vertically and symmetrically arranged on the upper side and the lower side of the 7 metal patches (9), and 1 metal strip (5) is connected between each group of metal through holes (3);
the upper surface of the medium frame (6) is provided with a microstrip line (8), and the microstrip line (8) is connected with the first laminated structure periodic gap unit (1) on the same side.
2. The reconfigurable holographic impedance modulation surface antenna based on a laminated structure and liquid crystal according to claim 1, characterized in that the thickness of the liquid crystal layer (4) is 4 times the thickness of the dielectric plate (2).
3. The reconfigurable holographic impedance modulation surface antenna based on a stacked structure and liquid crystal according to claim 1, characterized in that the microstrip line (8) is an exponentially graded transition microstrip line.
4. The reconfigurable holographic impedance modulation surface antenna based on a stacked structure and liquid crystal according to claim 1, characterized in that the width of the metal strip (5) is 1 mm.
5. The reconfigurable holographic impedance modulation surface antenna based on a stacked structure and liquid crystal according to claim 1, characterized in that the thickness of the dielectric frame (6) is 2.5 mm.
6. The reconfigurable holographic impedance modulation surface antenna based on a laminated structure and liquid crystal according to claim 5, characterized in that the thickness of the liquid crystal layer (4) is 2mm and the thickness of the dielectric plate (2) is 0.5 mm.
7. The reconfigurable holographic impedance modulation surface antenna based on the laminated structure and the liquid crystal according to claim 1, wherein the dielectric constant of the liquid crystal in the liquid crystal layer (4) is 2.74-5.44.
8. The reconfigurable holographic impedance modulation surface antenna based on a stacked structure and liquid crystals as claimed in claim 1, characterized in that in the same stacked structure periodic slot unit (1), 2 metal strips (5) are located at one quarter and three quarters of the length of the stacked structure periodic slot unit (1), respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110399294.XA CN113097750B (en) | 2021-04-14 | 2021-04-14 | Reconfigurable holographic impedance modulation surface antenna based on laminated structure and liquid crystal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110399294.XA CN113097750B (en) | 2021-04-14 | 2021-04-14 | Reconfigurable holographic impedance modulation surface antenna based on laminated structure and liquid crystal |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113097750A CN113097750A (en) | 2021-07-09 |
| CN113097750B true CN113097750B (en) | 2022-06-21 |
Family
ID=76677236
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110399294.XA Active CN113097750B (en) | 2021-04-14 | 2021-04-14 | Reconfigurable holographic impedance modulation surface antenna based on laminated structure and liquid crystal |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113097750B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113471716B (en) * | 2021-09-06 | 2022-01-11 | 华南理工大学 | Holographic antenna, control method, computer device, and storage medium |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008035424A (en) * | 2006-07-31 | 2008-02-14 | Toyota Central Res & Dev Lab Inc | Array antenna |
| CN104409852A (en) * | 2014-12-25 | 2015-03-11 | 哈尔滨工业大学 | Fixed frequency scanning leaky-wave antenna based on liquid crystal material |
| CN105006656A (en) * | 2015-07-24 | 2015-10-28 | 哈尔滨工业大学 | Electric control scanning waveguide leaky-wave antenna based on liquid crystal |
| CN105006632A (en) * | 2015-07-24 | 2015-10-28 | 哈尔滨工业大学 | Liquid crystal electric control zero crossing scanning leaky-wave antenna based on half-mode pectinate line waveguide |
| CN105071019A (en) * | 2015-07-24 | 2015-11-18 | 哈尔滨工业大学 | Liquid crystal electrical control zero-crossing scanning leaky wave antenna based on comb-line waveguide |
| CN108718001A (en) * | 2018-04-25 | 2018-10-30 | 电子科技大学 | A kind of wave beam based on liquid crystal material is adjustable leaky-wave antenna |
| CN108987910A (en) * | 2017-06-02 | 2018-12-11 | 江苏万邦微电子有限公司 | One kind being based on LCD electric-controlled scanning wave guide wave leakage antenna |
| CN109004341A (en) * | 2018-09-02 | 2018-12-14 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | Substrate integration wave-guide Sine Modulated leaky-wave antenna |
| CN109037925A (en) * | 2018-06-29 | 2018-12-18 | 中国人民解放军陆军工程大学 | A kind of integrated ridge gap waveguide of substrate and broadband circle polarized leaky-wave antenna |
| WO2020015729A1 (en) * | 2018-07-19 | 2020-01-23 | Huawei Technologies Co., Ltd. | Electronically beam-steerable, low-sidelobe composite right-left-handed (crlh) metamaterial array antenna |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9385435B2 (en) * | 2013-03-15 | 2016-07-05 | The Invention Science Fund I, Llc | Surface scattering antenna improvements |
| CN105006631B (en) * | 2015-07-24 | 2017-11-03 | 哈尔滨工业大学 | Automatically controlled zero scan wave guide wave leakage antenna excessively based on liquid crystal |
| CN112640213B (en) * | 2018-09-10 | 2022-01-28 | Hrl实验室有限责任公司 | Electronically controllable holographic antenna with reconfigurable radiator for broadband frequency tuning |
-
2021
- 2021-04-14 CN CN202110399294.XA patent/CN113097750B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008035424A (en) * | 2006-07-31 | 2008-02-14 | Toyota Central Res & Dev Lab Inc | Array antenna |
| CN104409852A (en) * | 2014-12-25 | 2015-03-11 | 哈尔滨工业大学 | Fixed frequency scanning leaky-wave antenna based on liquid crystal material |
| CN105006656A (en) * | 2015-07-24 | 2015-10-28 | 哈尔滨工业大学 | Electric control scanning waveguide leaky-wave antenna based on liquid crystal |
| CN105006632A (en) * | 2015-07-24 | 2015-10-28 | 哈尔滨工业大学 | Liquid crystal electric control zero crossing scanning leaky-wave antenna based on half-mode pectinate line waveguide |
| CN105071019A (en) * | 2015-07-24 | 2015-11-18 | 哈尔滨工业大学 | Liquid crystal electrical control zero-crossing scanning leaky wave antenna based on comb-line waveguide |
| CN108987910A (en) * | 2017-06-02 | 2018-12-11 | 江苏万邦微电子有限公司 | One kind being based on LCD electric-controlled scanning wave guide wave leakage antenna |
| CN108718001A (en) * | 2018-04-25 | 2018-10-30 | 电子科技大学 | A kind of wave beam based on liquid crystal material is adjustable leaky-wave antenna |
| CN109037925A (en) * | 2018-06-29 | 2018-12-18 | 中国人民解放军陆军工程大学 | A kind of integrated ridge gap waveguide of substrate and broadband circle polarized leaky-wave antenna |
| WO2020015729A1 (en) * | 2018-07-19 | 2020-01-23 | Huawei Technologies Co., Ltd. | Electronically beam-steerable, low-sidelobe composite right-left-handed (crlh) metamaterial array antenna |
| CN109004341A (en) * | 2018-09-02 | 2018-12-14 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | Substrate integration wave-guide Sine Modulated leaky-wave antenna |
Non-Patent Citations (2)
| Title |
|---|
| Compact Equal-Width Equal-Length Phase Shifter With Slow-Wave Half-Mode Substrate Integrated Waveguide for 5G Applications;Yong Mao Huang;《IEEE Access》;20191031;全文 * |
| 方向图可重构全息阻抗调制天线特性研究;谢冰芳;《中国优秀硕士学位论文全文数据库》;20190115;全文 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113097750A (en) | 2021-07-09 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112259958B (en) | Single-feed double-frequency double-circular-polarization millimeter wave dielectric resonator antenna | |
| CN104993249A (en) | Single-passband bilateral wave-absorbing composite metamaterial and radome and antenna system including same | |
| CN110311219A (en) | A kind of series feed micro-strip array antenna and system for millimetre-wave radar | |
| CN109818158B (en) | Broadband SIW back-cavity slot antenna array adopting L-shaped slot units | |
| CN111430919A (en) | Miniaturized UWB-MIMO antenna with three-notch characteristic | |
| CN113097750B (en) | Reconfigurable holographic impedance modulation surface antenna based on laminated structure and liquid crystal | |
| CN113809518A (en) | Microwave and millimeter wave large-frequency ratio common-aperture antenna with high isolation | |
| CN113764878A (en) | Wave beam reconfigurable leaky-wave antenna | |
| Jiao et al. | A low mutual coupling MIMO antenna using 3-D electromagnetic isolation wall structures | |
| CN114256614A (en) | Ultra-wideband planar antenna array applied to millimeter wave communication system | |
| CN109921187B (en) | Millimeter wave dual-polarized antenna and array antenna | |
| CN110828998A (en) | Dual-frequency four-unit millimeter wave microstrip slot MIMO antenna | |
| CN111786118B (en) | Equipment common-type gap coupling antenna based on liquid crystal adjustable material | |
| CN111509392B (en) | High scanning rate antenna of wave beam based on microstrip line structure | |
| CN114284712A (en) | Broadband high-gain planar end-fire antenna based on artificial surface plasmon | |
| Cengiz et al. | Optimizing Ridge Gap waveguide based slot antenna shape for maximum gain and bandwidth for satellite applications | |
| CN109861003B (en) | Metamaterial broadband high-isolation MIMO antenna | |
| Ahmed et al. | Design of a dual linear polarization antenna using split ring resonators at X-band | |
| CN112531355A (en) | +/-45-degree dual-polarized millimeter wave array antenna | |
| CN205159502U (en) | High rectangle degree trapped wave ultra wide band slot antenna of difference ladder feed | |
| Jizat et al. | Exploitation of the electromagnetic band gap (EBG) in 3-dB multi-layer branch-line coupler | |
| Alsahulli et al. | Antenna Design and Simulation for 2x2 MIMO System for IEEE-802.11 a Application | |
| Wen et al. | Spoof Surface Plasmon Polaritons Based Antenna and Array by Exciting both Even and Odd Mode Resonances | |
| Chouikhi et al. | Metamaterial Decoupling MIMO Antennas for 5G Communication | |
| Smari et al. | Design of a Small Metamtrial Antenna for Millimetric Wave Applications |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |