scholarly journals A Three-Dimensional Enhanced Imaging Method on Human Body for Ultra-Wideband Multiple-Input Multiple-Output Radar

Electronics ◽  
2018 ◽  
Vol 7 (7) ◽  
pp. 101 ◽  
Author(s):  
Dizhi Zhao ◽  
Tian Jin ◽  
Yongpeng Dai ◽  
Yongping Song ◽  
Xiangchenyang Su
Keyword(s):  
Human Body ◽  
Multiple Input Multiple Output ◽  
Three Dimensional ◽  
Ultra Wideband ◽  
Imaging Method ◽  
Multiple Input ◽  
Input Multiple Output ◽  
Enhanced Imaging

scholarly journals Comparison of 10–18 GHz SAR and MIMO-based short-range imaging radars

2010 ◽  
Vol 2 (3-4) ◽  
pp. 369-377 ◽  
Author(s):  
Timofey Savelyev ◽  
Xiaodong Zhuge ◽  
Bill Yang ◽  
Pascal Aubry ◽  
Alexander Yarovoy ◽  
...  
Keyword(s):  
Short Range ◽  
Multiple Input Multiple Output ◽  
Vertical Plane ◽  
Ultra Wideband ◽  
Imaging Method ◽  
Digital Beamforming ◽  
Mimo Antenna ◽  
Multiple Input ◽  
Input Multiple Output ◽  
Concealed Weapon Detection

This paper presents an experimental investigation of two approaches to short-range radar imaging at microwaves by means of ultra-wideband (UWB) technology. The first approach represents a classical synthetic aperture radar (SAR) that employs a transmit–receive antenna pair on mechanical scanner. The second one makes use of a multiple input multiple output (MIMO) antenna array that scans electronically in the horizontal plane and mechanically, installed on the scanner, in the vertical plane. The mechanical scanning in only one direction reduces significantly the measurement time. Two respective prototypes have been built and compared. Both systems comprise the same 10–18 GHz antennas and multi-channel video impulse electronics while the same data processing and imaging method based on Kirchhoff migration is applied to acquired data for digital beamforming. The study has been done for an application of concealed weapon detection.

Design of an interlocked four-port MIMO antenna for UWB automotive communications

2021 ◽  
pp. 1-8
Author(s):  
M. Saravanan ◽  
R. Kalidoss ◽  
B. Partibane ◽  
K. S. Vishvaksenan
Keyword(s):  
Multiple Input Multiple Output ◽  
Performance Estimation ◽  
Ultra Wideband ◽  
Antenna Element ◽  
Frequency Range ◽  
Mimo Antenna ◽  
Multiple Input ◽  
Input Multiple Output ◽  
Operating Bandwidth ◽  
Peak Gain

Abstract The design, analysis, fabrication, and testing of a four-port multiple-input multiple-output (MIMO) antenna is reported in this paper for automotive communications. The MIMO antenna is constructed using the basic antenna element exploiting a slot geometry. Two such antennas are developed on the same microwave laminate to develop a two-port MIMO antenna. Two such microwave laminates are interlocked to create the four-port MIMO scheme. The most distinct feature of the proposed architecture is that the inter-port isolation is well-taken care without the need for an external decoupling unit. The four-port MIMO antenna has an overall volume of 32 × 15 × 32 mm3. The prototype MIMO antenna is fabricated and the measurements are carried out to validate the simulation results. The antenna offers ultra-wideband (UWB) characteristics covering the frequency range of 2.8–9.5 GHz. The average boresight gain of the antenna ranges from 3.2 to 5.41 dBi with the peak gain at 8 GHz. The simulated efficiency of the antenna is greater than 73% within the operating bandwidth. The MIMO parameters such as envelope correlation coefficient, diversity gain, and mean effective gain are evaluated and presented. The appropriateness of the proposed antenna for deployment in the shark fin housing of the present-day automobiles is verified using on-car performance estimation.

Compact four-port vertically polarized UWB monopole antenna for MIMO communications

Circuit World ◽  
2020 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Premalatha J. ◽  
Sheela D.
Keyword(s):  
Antenna Array ◽  
Performance Metrics ◽  
Multiple Input Multiple Output ◽  
Unit Cell ◽  
Ultra Wideband ◽  
Mimo Communications ◽  
Content Type ◽  
Directional Radiation ◽  
Multiple Input ◽  
Input Multiple Output

Purpose This paper aims to present the design of a compact vertically polarized four-element UWB antenna suitable for MIMO communications. Design/methodology/approach The unit cell antenna is constructed using a square ring radiator excited through a stepped impedance feed. The proposed antenna covers the Ultra-wideband (UWB) spectrum ranging from 2.2 to 12.3 GHz. The isolation between the unit cell antennas in the array is enhanced using a simple microstrip line resonator. The decoupling element is connected to the ground through a via. Findings The proposed scheme offers at least 16 dB improvement in the port-to-port coupling. Furthermore, the four-element antenna array is constructed using a specific interlocking scheme. The proposed antenna array’s Multiple Input Multiple Output (MIMO) performance metrics are analyzed. Originality/value By suitably selecting the excitation port, directional radiation patterns can be realized. The combined radiation pattern covers 360 degrees. A prototype antenna array is fabricated, and the simulation results are verified using real-time experiments. The proposed antenna is a suitable candidate for shark fin housing in automotive communications.

A small footprint ultra-wideband multiple-input multiple-output antenna

2015 ◽  
Author(s):  
Muhammad Saeed Khan ◽  
Antonio-D. Capobianco ◽  
Sajid Asif ◽  
Adnan Iftikhar ◽  
Benjamin D. Braaten ◽  
...  
Keyword(s):  
Multiple Input Multiple Output ◽  
Ultra Wideband ◽  
Multiple Input ◽  
Input Multiple Output ◽  
Small Footprint

MIMO DS-BPAM UWB SYSTEM WITH SRAKE RECEIVER OVER MULTIPATH FADING CHANNELS

2009 ◽  
Vol 18 (06) ◽  
pp. 1075-1080
Author(s):  
ZHIQUAN BAI ◽  
YUANQUAN XU ◽  
XIAOTONG LI ◽  
RONGKAI LI ◽  
DONGFENG YUAN ◽  
...  
Keyword(s):  
Fading Channels ◽  
Multiple Input Multiple Output ◽  
Pulse Amplitude ◽  
Multipath Fading ◽  
Block Codes ◽  
Ultra Wideband ◽  
Multipath Fading Channels ◽  
Space Time Block Codes ◽  
Multiple Input ◽  
Input Multiple Output

In this paper, we investigate the multiple input multiple output (MIMO) direct sequence bipolar pulse amplitude modulation (DS-BPAM) ultra wideband (UWB) system over indoor multipath fading channels based on the research of Alamouti space-time block codes (STBC) and DS-BPAM UWB system. Selective Rake (SRake) receiver is employed in this paper in order to deal with the multipath effects. Theoretical bit error probability of the MIMO DS-BPAM UWB system with SRake receiver is derived. Simulation results of the MIMO DS-BPAM UWB system with SRake receiver and conventional coherent receiver over multipath fading channels are provided. The results show the efficiency of the MIMO DS-BPAM UWB system with SRake receiver.

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