scholarly journals High Performance Metasurface Antennas

2020 ◽  
Author(s):  
Haisheng Hou ◽  
Haipeng Li ◽  
Guangming Wang ◽  
Tong Cai ◽  
Xiangjun Gao ◽  
...  
Keyword(s):  
Electromagnetic Wave ◽  
Circular Polarization ◽  
Linear Polarization ◽  
Patch Antenna ◽  
High Performance ◽  
Polarization State ◽  
High Gain ◽  
Electromagnetic Properties ◽  
High Gain Antenna ◽  
Block Effect

Recently, metasurfaces (MSs) have received tremendous attention because their electromagnetic properties can be controlled at will. Generally, metasurface with hyperbolic phase distributions, namely, focusing metasurface, can be used to design high-gain antennas. Besides, metasurface has the ability of controlling the polarization state of electromagnetic wave. In this chapter, we first propose a new ultrathin broadband reflected MS and take it into application for high-gain planar antenna. Then, we propose multilayer multifunctional transmitted MSs to simultaneously enhance the gain and transform the linear polarization to circular polarization of the patch antenna. This kind of high-gain antenna eliminates the feed-block effect of the reflected ones.

scholarly journals Dual- Band Antenna for Wi-Fi and 5G Applications

2019 ◽  
Vol 9 (1S5) ◽  
pp. 130-131
Keyword(s):  
Circular Polarization ◽  
Linear Polarization ◽  
Patch Antenna ◽  
Return Loss ◽  
Axial Ratio ◽  
Band Width ◽  
Dual Band ◽  
Circular Patch ◽  
Dual Band Antenna ◽  
Circular Patch Antenna

In this communication, a circular patch antenna is reported for dual- band operation based on VIAs. Initially the patch is resonating at single band with Linear Polarization (LP), and the Circular Polarization (CP) is obtained by inserting semi circular cuts at the edges of circular patch. The second band is achieved by loading the vertical metallic VIAs along the circumference of the patch antenna. The reported antenna is working at 2.4 GHz (Wi-Fi) and 3.5 GHz (5G) bands with Return Loss Band Width (RLBW) of 4.83% and 10.37% respectively. The Axial Ratio (AR) bandwidth at 5G band is 2.38% (3.31- 3.39 GHz)

scholarly journals Inverted L-Shaped CP Patch Antenna with Corner-Truncated Partial Ground Plane Diagonally Adjoined with Square Branch for L-Band Applications

Sensors ◽  
2021 ◽  
Vol 21 (4) ◽  
pp. 1085
Author(s):  
Phanuphong Boontamchauy ◽  
Titipong Lertwiriyaprapa ◽  
Chuwong Phongcharoenpanich
Keyword(s):  
Circular Polarization ◽  
Linear Polarization ◽  
Patch Antenna ◽  
Satellite Communication ◽  
Ground Plane ◽  
Axial Ratio ◽  
Concurrent Use ◽  
L Band ◽  
Good Agreement

This research proposes an inverted L-shaped patch antenna with a corner-truncated partial ground plane diagonally adjoined to a square branch for L-band applications. The adjoining square branch was used to perturb linear polarization for circular polarization, and the corner-truncated partial ground plane was utilized to enhance the axial ratio bandwidth (ARBW). Simulations were performed, an antenna prototype was fabricated, and experiments were carried out. The simulation and measured results were in good agreement. The proposed antenna could achieve an ARBW of 77.87% (1.09–2.48 GHz). The novelty of this research lies in the concurrent use of a square branch and a corner-truncated partial ground plane to realize wide ARBW in an L-band, rendering the technology suitable for satellite communication and navigation applications.

scholarly journals Polarization Reconfigurable Square Patch Antenna for Wireless Communications

2018 ◽  
Vol 7 (4) ◽  
pp. 103-108 ◽  
Author(s):  
M. Saravanan ◽  
M. J. S. Rangachar
Keyword(s):  
Wireless Communications ◽  
Wireless Communication ◽  
Circular Polarization ◽  
Linear Polarization ◽  
Patch Antenna ◽  
Axial Ratio ◽  
Reconfigurable Antenna ◽  
Left Hand ◽  
Right Hand ◽  
Peak Gain

In this paper, a single fed polarization reconfigurable antenna is proposed. The antenna consists of a radiating patch incorporated with a diagonal-shaped slot at its center. Four p-i-n diodes are used for polarization reconfiguration. The p-i-n diodes are placed in diagonal slot region. The proposed antenna is designed to operate in three states – linear polarization (LP), left-hand circular polarization (LHCP) and right-hand circular polarization (RHCP) by biasing corresponding p-i-n diodes. The antenna gives measured peak gain of 6.2 dBi for LP state and 5.82 dBic for both RHCP and LHCP states. It also achieves 3-dB axial ratio bandwidth of 5.95% for both RHCP and LHCP configurations. The antenna finds application in areas of modern wireless communication.

scholarly journals Active Control of the THz Wave Polarization State by an Electronically Controlled Graphene Composite Metasurface

2021 ◽  
Vol 9 ◽  
Author(s):  
Guocui Wang ◽  
Bin Hu ◽  
Muhammad Ismail Khan ◽  
Yan Zhang
Keyword(s):  
Circular Polarization ◽  
Linear Polarization ◽  
Chemical Potential ◽  
Polarization State ◽  
Quarter Wave Plate ◽  
Wave Polarization ◽  
Elliptical Polarization ◽  
Wave Plate ◽  
Thz Wave ◽  
Quarter Wave

Active control of terahertz (THz) wave polarization state is of great significance for sensitive detection, imaging and communication. Here, a tunable THz quarter wave plate is designed by electronically controlling a composite metasurface consisting of the gold cross antennas and a monolayer graphene. The graphene composite metasurface acts as a quarter-wave plate when the chemical potential of graphene is 0 eV, by which the polarization state of the incident THz wave is converted from linear polarization to circular polarization. After the chemical potential of graphene is increased gradually, and to 0.5 eV, the transmitted polarization state of the THz wave is changed from right circular polarization to right elliptical polarization, and to linear polarization. Furthermore, the polarization state of the THz wave is able to be changed from left circular polarization to left elliptical polarization, and to linear polarization if the device is clockwise rotated by 90°. Therefore, the polarization state of THz wave could be actively controlled by the proposed tunable THz quarter wave plate. Our work will offer a new avenue for tunable THz polarization modulation devices.

scholarly journals High-gain cavity backed patch antenna arrays at 140 GHz based on LTCC technology

2019 ◽  
Vol 11 (08) ◽  
pp. 829-834 ◽  
Author(s):  
Zihang Qi ◽  
Xiuping Li ◽  
Jinjin Chu ◽  
Jun Xiao ◽  
Hua Zhu
Keyword(s):  
Antenna Arrays ◽  
Patch Antenna ◽  
Impedance Matching ◽  
High Gain ◽  
Ceramic Technology ◽  
Antenna Element ◽  
Maximum Gain ◽  
Gain Enhancement ◽  
High Gain Antenna ◽  
Element Array

AbstractIn this paper, high-gain cavity backed patch antenna arrays are proposed based on low temperature co-fired ceramic technology at 140 GHz. By introducing a substrate integrated cavity to the patch antenna element, the gain is enhanced by 3.3 dB. Moreover, a rectangular ring is loaded around the patch for better impedance matching and further gain enhancement. The final simulated maximum gain of the proposed antenna element is 9.8 dBi. Based on the proposed high-gain antenna element, a 4 × 4-element array and an 8 × 8- element array are presented. The 4 × 4-element array shows a measured maximum gain of 16.9 dBi with 9.5 GHz bandwidth (136.2–145.7 GHz) and the 8 × 8-element array shows a measured maximum gain of 21.8 dBi with 9.8 GHz bandwidth(136.7–146.5 GHz), respectively.

scholarly journals Recent advances in metamaterial klystrons

2021 ◽  
Vol 8 ◽  
pp. 9
Author(s):  
Xin Wang ◽  
Xianfeng Tang ◽  
Shifeng Li ◽  
Junpu Ling ◽  
Xuanming Zhang ◽  
...  
Keyword(s):  
High Performance ◽  
High Efficiency ◽  
Development Trend ◽  
High Gain ◽  
Electromagnetic Properties ◽  
Active Devices ◽  
Recent Advances ◽  
Extended Interaction ◽  
The Development Trend ◽  
Electromagnetic Metamaterials

As a kind of artificially structured media, electromagnetic metamaterials (MTMs) have exotic electromagnetic properties that are not found or difficult to achieve in natural materials. This class of metal/dielectric-structured artificial media has attracted great attention during the past two decades and made important breakthroughs. A variety of passive and active devices based on MTMs have been developed rapidly. Especially MTM klystrons, which show very remarkable advantages, including miniaturization, high gain, and high efficiency in the microwave band. MTM extended interaction klystrons creatively combine the advantages of MTMs, extended interaction technology, and klystrons. It provides a new design idea for the development of brand-new klystrons with high performance. In this review paper, we report the recent advances in MTM klystrons including MTM extended interaction oscillator and MTM extended interaction klystron amplifier. Furthermore, the prospects and challenges of MTM klystrons are discussed. Finally, the development trend is concluded.

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