scholarly journals Isolation Improvement of a Microstrip Patch Array Antenna for WCDMA Indoor Repeater Applications

2012 ◽  
Vol 2012 ◽  
pp. 1-8
Author(s):  
Hongmin Lee ◽  
Jinwon Park
Keyword(s):  
Code Division Multiple Access ◽  
Mutual Coupling ◽  
Array Antenna ◽  
Coupled Line ◽  
Microstrip Patch ◽  
Soft Surface ◽  
Unit Cells ◽  
Feed Network ◽  
Backward Radiation ◽  
Code Division Multiple

This paper presents the isolation improvement techniques of a microstrip patch array antenna for the indoor wideband code division multiple access (WCDMA) repeater applications. One approach is to construct the single-feed switchable feed network structure with an MS/NRI coupled-line coupler in order to reduce the mutual coupling level between antennas. Another approach is to insert the soft surface unit cells near the edges of the microstrip patch elements in order to reduce backward radiation waves. In order to further improve the isolation level, the server antenna and donor antenna are installedinorthogonal direction. The fabricated antenna exhibits a gain over 7 dBi and higher isolation level between server and donor antennas below −70 dB at WCDMA band.

scholarly journals Four-Element Microstrip Patch Array Antenna with Corporate-Series Feed Network for 5G Communication

2020 ◽  
Vol 2020 ◽  
pp. 1-12
Author(s):  
Janam Maharjan ◽  
Dong-You Choi
Keyword(s):  
Microstrip Antennas ◽  
Array Antenna ◽  
Frequency Bandwidth ◽  
Microstrip Patch ◽  
Feeding Technique ◽  
Feed Network ◽  
Overall Performance ◽  
5G Communication ◽  
Element Array ◽  
Series Technique

The paper proposes a simple four-element microstrip patch array antenna fed with corporate-series technique. The paper compares the proposed design with four-element antennas fed with only series-fed and corporate-fed microstrip antennas. All three antenna designs use rectangular microstrip patch elements with two insets and slots on both sides of the patch. The patch elements are accompanied by Yagi elements: three director elements and two reflector elements. Through comparison of simulation results, the paper shows that four-element array antenna with combined corporate-series feeding technique performs better compared to antennas with only either series or corporate feeding network. The proposed corporate-series fed antenna achieves better performance with wide frequency bandwidth of 25.04–30.87 GHz and gain of 9.5 dB. The antenna has an end-fire radiation pattern. Overall performance shows that the proposed corporate-series-fed microstrip patch antenna with Yagi elements is suitable for next generation 5G communication.

Low mutual coupling 2 × 2 microstrip patch array antenna by using novel shapes of defect ground structure

2010 ◽  
Vol 52 (5) ◽  
pp. 1208-1215 ◽  
Author(s):  
Dalia N. Elsheakh ◽  
Hala A. Elsadek ◽  
Esmat A. Abdallah ◽  
Magdy F. Iskander ◽  
Hadia Elhenawy
Keyword(s):  
Mutual Coupling ◽  
Array Antenna ◽  
Ground Structure ◽  
Microstrip Patch ◽  
Defect Ground Structure

scholarly journals Reduction of Mutual Coupling between Radiating Elements of an Array Antenna Using EBG Electromagnetic Band Structures

2021 ◽  
pp. 91-98
Author(s):  
Sara Said ◽  
◽  
Abdenacer Es-salhi ◽  
Mohammed Elhitmy
Keyword(s):  
Communication Systems ◽  
Mutual Coupling ◽  
Array Antenna ◽  
Wireless Communication Systems ◽  
Electromagnetic Band Gap ◽  
High Impedance ◽  
Unit Cells ◽  
Antenna Configuration ◽  
Element Array ◽  
High Impedance Surface

In this paper, a new array antenna configuration based on Electromagnetic Band Gap (EBG) structures has been proposed for 3.5GHz wireless communication systems. The proposed slotted EBG structure, high impedance surface (SHI), consists of three squares and a square ring deposited on a substrate (Rogers RO4350) which has a relative permittivity of 10.2 and a thickness of 1.27mm. Initially a matrix of 3×7 unit cells of EBG structures is introduced between two patches of an array and then a matrix of 3×14 unit cell of EBG structures is integrated between eight patches, which resonate around 3.5GHz (Wi MAX). The insertion of these structures between the radiating elements of an array antenna reduces the mutual coupling and antenna dimensions by approximately (8dB, 11%) and (12 dB, 5%) respectively for two, eight elements array antenna. In addition, the directivity has been slightly improved in the presence of EBG structures, from 4.52dB to 6.09dB for a two-element array antenna, and from 8.18dB to 8.4dB for an eight-element antenna.

scholarly journals Corporate Feed, Compact 2X2 Array Antenna With Enhanced Radiation Characteristics using Metamaterial Structure

2019 ◽  
Vol 8 (4) ◽  
pp. 2807-2812
Keyword(s):  
Mutual Coupling ◽  
Transverse Electric ◽  
Side Lobe ◽  
Transverse Magnetic ◽  
Array Antenna ◽  
Magnetic Conductor ◽  
Radiation Characteristics ◽  
High Impedance ◽  
Unit Cells ◽  
High Impedance Surface

In current study, mushroom type metamaterial substrate is designed to operate at ISM band and is embedded in 2X2 array as a ground. Unique properties of mushroom type metamaterial substrate like as high impedance surface (HIS) helped in design of low aperture antenna, Artificial magnetic conductor (AMC) helps in enhancing the radiation characteristics and Forbidden band gap (FBG) helps in suppressing transverse electric (TE) and transverse magnetic (TM) wave propagation hence point of mutual coupling and side lobe levels are reduced. So, 2X2 array antenna with corporate feed resonating at 2.5GHz is embedded by array of mushroom type metamaterial unit cells is designed in HFSS and obtained results are compared with 2X2 array resonating at 2.5GHz on conventional conducting ground results. An enhancement in impedance band width of 2.47%, gain of 2.91dB and with lowered side lobe reduction of 3.74dB.

scholarly journals High-Isolation Leaky-Wave Array Antenna Based on CRLH-Metamaterial Implemented on SIW with ±30o Frequency Beam-Scanning Capability at Millimetre-Waves

Electronics ◽  
2019 ◽  
Vol 8 (6) ◽  
pp. 642 ◽  
Author(s):  
Mohammad Alibakhshikenari ◽  
Bal Singh Virdee ◽  
Chan H. See ◽  
Raed A. Abd-Alhameed ◽  
Francisco Falcone ◽  
...  
Keyword(s):  
Mutual Coupling ◽  
Array Antenna ◽  
Impedance Bandwidth ◽  
Frequency Range ◽  
Leaky Wave ◽  
Beam Scanning ◽  
Millimetre Wave ◽  
Operating Frequency Range ◽  
Unit Cells ◽  
Transverse Slot

The paper presents a feasibility study on the design of a new metamaterial leaky-wave antenna (MTM-LWA) used in the construction of a 1 × 2 array which is implemented using substrate-integrated waveguide (SIW) technology for millimetre-wave beamforming applications. The proposed 1 × 2 array antenna consists of two LWAs with metamaterial unit-cells etched on the top surface of the SIW. The metamaterial unit-cell, which is an E-shaped transverse slot, causes leakage loss and interrupts current flow over SIW to enhance the array’s performance. The dimensions of the LWA are 40 × 10 × 0.75 mm3. Mutual-coupling between the array elements is suppressed by incorporating a metamaterial shield (MTM-shield) between the two antennas in the array. The LWA operates over a frequency range of 55–65 GHz, which is corresponding to 16.66% fractional bandwidth. The array is shown to exhibit beam-scanning of ±30° over its operating frequency range. Radiation gain in the backward (−30°), broadside (0°), and forward (+30°) directions are 8.5 dBi, 10.1 dBi, and 9.5 dBi, respectively. The decoupling slab is shown to have minimal effect on the array’s performance in terms of impedance bandwidth and radiation specifications. The MTM-shield is shown to suppress the mutual coupling by ~25 dB and to improve the radiation gain and efficiency by ~1 dBi and ~13% on average, respectively.

Mutual Coupling Reduction in Microstrip Patch Antenna Arrays Using Parallel Coupled-Line Resonators

2017 ◽  
Vol 16 ◽  
pp. 2146-2149 ◽  
Author(s):  
Kuttathati Srinivasan Vishvaksenan ◽  
Kaliyappa Mithra ◽  
Ramalingam Kalaiarasan ◽  
Kaliyappa Santhosh Raj
Keyword(s):  
Antenna Arrays ◽  
Patch Antenna ◽  
Mutual Coupling ◽  
Microstrip Patch Antenna ◽  
Coupled Line ◽  
Microstrip Patch ◽  
Mutual Coupling Reduction

scholarly journals Design and Simulation of Metamaterial based Circularly Polarized Antenna Array

2021 ◽  
Vol 23 (08) ◽  
pp. 437-442
Author(s):  
Rohini G.Bhatkoorse ◽  
◽  
Dr. Mahesh A ◽  
Keyword(s):  
Resonant Frequency ◽  
Mutual Coupling ◽  
Coupling Effect ◽  
Array Antenna ◽  
Negative Permittivity ◽  
Metamaterial Structure ◽  
Circularly Polarized ◽  
Microstrip Patch ◽  
Planar Shape ◽  
Permittivity And Permeability

The microstrip patch array antenna is usually designed as a broadside radiator. The radiating area of the patch can be of any planar shape from elliptical to square, but rectangular is preferred over other shapes. When elements of antenna are repeated, it is called as an array of antennas. When the distance between antennas is reduced, mutual coupling effect occurs. This effect occurs when the distance between the antennas is less than 0.5and this affects the gain and efficiency of the antennas. This effect can be reduced by using metamaterials. To reduce the mutual coupling between the antenna elements the metamaterial structure is artificially designed to obtain negative permittivity and permeability using HFSS and the results are verified using MATLAB. These metamaterials are placed between the patch elements of 1×2 circularly polarized array antenna when the distance between the patches is 0.2 for both RT duroid and FR4 epoxy substrate for 5GHz resonant frequency.

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