scholarly journals Three-Mode Vortex Wave Generator with Double-Layer Patch Antennas

2019 ◽  
Vol 2019 ◽  
pp. 1-7 ◽  
Author(s):  
Jun Hu ◽  
Tong-Tong Qiu ◽  
Xue Lan ◽  
Wei Xu ◽  
Song-Song Qian
Keyword(s):  
Angular Momentum ◽  
Double Layer ◽  
Orbital Angular Momentum ◽  
Multiple Input Multiple Output ◽  
Patch Antennas ◽  
Circular Array ◽  
Planar Antennas ◽  
Multiple Input ◽  
Wave Generator ◽  
Input Multiple Output

With the development of Multiple-Input Multiple-Output technologies, researches on radio vortex wave with orbital angular momentum have become active. At the same time, generators of miniaturized planar antennas have become very interesting. Considering multilayer package, we proposed a uniform circle array consisting of four double-layer patch antennas with microstrip backfeeds. The antenna can generate three modes of vortex waves, which works at frequency 7.6GHz with a bandwidth 8.5%. Compared with orbital angular momentum antennas of phased uniform circular array with other cells, this proposed structure can be easily integrated with planar feeding networks and decoupling networks.

scholarly journals The Capacity Gain of Orbital Angular Momentum Based Multiple-Input-Multiple-Output System

2016 ◽  
Vol 6 (1) ◽  
Author(s):  
Zhuofan Zhang ◽  
Shilie Zheng ◽  
Yiling Chen ◽  
Xiaofeng Jin ◽  
Hao Chi ◽  
...  
Keyword(s):  
Angular Momentum ◽  
Orbital Angular Momentum ◽  
Multiple Input Multiple Output ◽  
Multiple Input ◽  
Input Multiple Output ◽  
Output System ◽  
Capacity Gain

Multiband Printed Slot Meander Patch Antenna for MIMO Implementation in 4G Handheld Devices

2013 ◽  
Vol 64 (3) ◽  
Author(s):  
Nassrin Ibrahim Mohamed ◽  
Tharek Abd. Rahman ◽  
Mursyidul Idzam Sabran
Keyword(s):  
Multiple Input Multiple Output ◽  
Antenna System ◽  
Handheld Devices ◽  
Portable Devices ◽  
Patch Antennas ◽  
Mimo Antenna ◽  
Low Profile ◽  
Proposed Model ◽  
Multiple Input ◽  
Input Multiple Output

This paper presents a Low-profile slot meander patch antennas. The antenna is a multiple communication bands for handheld devices and implements multiple-input–multiple-output (MIMO) technique. The proposed model covers LTE band-11 1.5 GHz Lower (1427.9 - 1452.9, 1475.9 - 1500.9), LTE band-2 PCS 1900 (1930 -1990, 1850 -1910), LTE band-7 2.6 GHz (2620-2690, 2500- 2570), and LTE band-22 3.5 GHz (3510-3590, 3410-3490) with dB matching criterion (VSWR 3:1). An isolation less than -15 dB has been obtained between two typical slot meander patch antennas. The isolation is achieved as a result of using CPW feeding mechanism and inserted CLL network isolator. This dual-feed (2-elements) planar antenna is fabricated and measured. The result of this small size structured MIMO antenna system shows a good radiation characteristics and small mutual coupling which is promising for MIMO applications in compact portable devices.

scholarly journals Double-Layer Low-Density Parity-Check Codes over Multiple-Input Multiple-Output Channels

2012 ◽  
Vol 2012 ◽  
pp. 1-6
Author(s):  
Yun Mao ◽  
Ying Guo ◽  
Jun Peng ◽  
Xueqin Jiang ◽  
Moon Ho Lee
Keyword(s):  
Double Layer ◽  
Mimo Systems ◽  
Layer Structure ◽  
Mimo System ◽  
Multiple Input Multiple Output ◽  
Low Density ◽  
Parity Check ◽  
Low Density Parity Check ◽  
Multiple Input ◽  
Input Multiple Output

We introduce a double-layer code based on the combination of a low-density parity-check (LDPC) code with the multiple-input multiple-output (MIMO) system, where the decoding can be done in both inner-iteration and outer-iteration manners. The present code, called low-density MIMO code (LDMC), has a double-layer structure, that is, one layer defines subcodes that are embedded in each transmission vector and another glues these subcodes together. It supports inner iterations inside the LDPC decoder and outeriterations between detectors and decoders, simultaneously. It can also achieve the desired design rates due to the full rank of the deployed parity-check matrix. Simulations show that the LDMC performs favorably over the MIMO systems.

scholarly journals Orbital Angular Momentum-Based Multiple-Input-Multiple-Output with Receive Antenna Shift Keying for 6G

Electronics ◽  
2021 ◽  
Vol 10 (13) ◽  
pp. 1567
Author(s):  
Sang-Hoon Lee ◽  
Ahmed Al Al Amin ◽  
Soo-Young Shin
Keyword(s):  
Angular Momentum ◽  
Wireless Communication ◽  
Communication Systems ◽  
Multiple Input Multiple Output ◽  
Wireless Communication Systems ◽  
Time Code ◽  
Multiple Input ◽  
Shift Keying ◽  
Input Multiple Output ◽  
Receive Antenna

Spectral efficiency is a major concern for future 6G wireless communication systems. Thus, an appropriate scheme is needed to provide channel capacity improvement for multiple transmitters and receiver-based wireless communication systems without consuming extra resource for communication (e.g., frequency/time/code) or causing interference. Therefore, to fulfill the mentioned requirements for the future 6G wireless network, orbital angular momentum-based multiple-input-multiple-output (OAM-MIMO) multiplexing technique is incorporated with the receive antenna shift keying (RASK) technique in this study (termed as the OAM-MIMO-RASK scheme). OAM-MIMO-RASK can transfer multiple symbols from multiple transmitters to different receivers simultaneously by using multiple subchannels using the OAM and RASK techniques without any interference or additional resource (frequency/time/code). The numerical results illustrated that the proposed OAM-MIMO-RASK can achieve almost double capacity than the existing OAM-MIMO scheme and significantly higher capacity than the existing RASK-based scheme for different values of signal-to-noise ratio. Moreover, the simulation result is validated by the theoretical result which is also shown by the numerical result. In addition, due to different normalized distances from the transmitters and receivers, the proposed OAM-MIMO-RASK scheme can achieve almost double capacity than the existing OAM-MIMO scheme by using OAM-MIMO and RASK technique effectively which is also depicted by the numerical results.

scholarly journals Direction Finding for Bistatic MIMO Radar with Uniform Circular Array

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Cao Yunhe ◽  
Zhang Zijing ◽  
Wang Shenghua ◽  
Dai Fengzhou
Keyword(s):  
Multiple Input Multiple Output ◽  
Mimo Radar ◽  
Search Method ◽  
Circular Array ◽  
Angle Estimation ◽  
Steering Vector ◽  
Direction Of Departure ◽  
Multiple Input ◽  
Input Multiple Output ◽  
Polynomial Rooting

A method of direction of arrival (DOA) and direction of departure (DOD) angle estimation based on polynomial rooting for bistatic multiple-input multiple-output (MIMO) radar with uniform circular array (UCA) configuration is proposed in this paper. The steering vector of the UCA is firstly transformed into a steering vector with a Vandermonde structure by using the Jacobi-Anger expansion. Then the null-spectrum function of the MIMO radar can be written as an expression in which the transmit and receive steering vectors are decoupled. Finally, a two-step polynomial rooting is used to estimate DOA and DOD of targets instead of two-dimensional multiple signal classification (MUSIC) search method for bistatic UCA MIMO radar. The angle estimation performance of the proposed method is similar to that of the MUSIC spectral search method, but the computation burden of the proposed polynomial rooting algorithm is much lower than that of the conventional MUSIC method. The simulation results of the proposed algorithm are presented and the performances are investigated and analyzed.

Compact MIMO antenna with optimized mutual coupling reduction using DGS

2013 ◽  
Vol 6 (2) ◽  
pp. 173-180 ◽  
Author(s):  
Ahmed A. Ibrahim ◽  
Mahmoud A. Abdalla ◽  
Adel B. Abdel-Rahman ◽  
Hesham F. A. Hamed
Keyword(s):  
Mutual Coupling ◽  
Multiple Input Multiple Output ◽  
Patch Antennas ◽  
Defected Ground Structure ◽  
Mimo Antenna ◽  
Wireless Applications ◽  
Microstrip Patch Antennas ◽  
Microstrip Patch ◽  
Multiple Input ◽  
Input Multiple Output

A design of low mutual coupling between two microstrip patch antennas for multi input multi output antenna is presented. The two antenna elements operate at 5.8 GHz for wireless applications. The reduction of mutual coupling between the antenna elements is achieved by using a defected ground structure (DGS). The DGS is inserted between the microstrip patch antenna elements to limit the surface waves between them. The separation between the edges of the two elements has been achieved to be only 0.058λ0. The analysis of the correlation coefficient, diversity gain and total active reflection coefficient is presented to validate the performance of the multiple-input–multiple-output (MIMO) antenna. The isolation of the proposed MIMO antenna is 28 dB at 5.8 GHz and the envelope correlation equals 0.003. Owing to these good performances each antenna can operate almost independently. A good agreement is achieved between the simulated and the measured results.

scholarly journals Design of MIMO Antenna with an Enhanced Isolation Technique

Electronics ◽  
2020 ◽  
Vol 9 (8) ◽  
pp. 1217
Author(s):  
Asif Khan ◽  
Suiyan Geng ◽  
Xiongwen Zhao ◽  
Zahoor Shah ◽  
Mishkat Ullah Jan ◽  
...  
Keyword(s):  
Multiple Input Multiple Output ◽  
Ground Layer ◽  
Patch Antennas ◽  
Isolation Technique ◽  
Mimo Antenna ◽  
Mimo Antennas ◽  
High Frequency Structure Simulator ◽  
Coaxial Probes ◽  
Multiple Input ◽  
Input Multiple Output

The isolation between the microstrip patches has a great significance to examine the performance of the multiple-input-multiple-output (MIMO) antennas. The patch antennas are placed on the top of 1.46 mm thick Rogers RO3003 substrate having a length of 60 mm, a width of 50 mm, and relative permittivity of 3. The distance between the resonators is 0.06λ and they are stimulated by two coaxial probes extended from the bottom ground layer. The defective ground structure of the H-shape slot is inserted on the bottom ground layer to achieve high isolation (mutual coupling reduction). The proposed MIMO antenna operates at 5.3 GHz frequency, which can be used for WiMAX, Wi-Fi, and future 5G services all over the world. The results of the designed structure have been simulated in a finite element method-based solver high-frequency structure simulator (HFSS). The simulated results show that the reflection coefficient (S11) and isolation (S21) at the desired frequency are −32 dB and −41 dB, respectively.

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