scholarly journals Far-field time reversal subwavelength imaging of sources based on grating structure

2017 ◽  
Vol 66 (4) ◽  
pp. 044101
Author(s):  
Gong Zhi-Shuang ◽  
Wang Bing-Zhong ◽  
Wang Ren ◽  
Zang Rui ◽  
Wang Xiao-Hua
Keyword(s):  
Time Reversal ◽  
Far Field ◽  
Subwavelength Imaging ◽  
Grating Structure

A Hybrid Synthetic Aperture and Time-Reversal MUSIC Algorithm for Subwavelength Radar Imaging

2021 ◽  
Author(s):  
Nathaniel Tamminga ◽  
Brianna Christensen ◽  
Sarah Petry ◽  
Enson Chang
Keyword(s):  
Synthetic Aperture Radar ◽  
Millimeter Wave ◽  
Time Reversal ◽  
Radar Imaging ◽  
Synthetic Aperture ◽  
Music Algorithm ◽  
Subwavelength Imaging ◽  
Chipless Rfid ◽  
Imaging Approach ◽  
Printing Cost

A promising chipless RFID approach uses millimeter-wave synthetic aperture radar (SAR) to image metal ink-printed ID tags from a meter or more away. Due to printing cost, it is desirable to minimize the size and spacing of metal patches within a tag, preferably into the subwavelength regime. Although circular SAR (CSAR) has a sharply peaked point response in 2D, its side lobes of closely-spaced targets interfere strongly with each other to distort the image. An alternative 2D subwavelength imaging approach with minimal side lobes is Time-Reversal MUSIC (TR-MUSIC). Traditional TR-MUSIC, however, requires a large number of transmitters and receivers. We propose a hybrid synthetic aperture TR-MUSIC algorithm (SATR-MUSIC) that combines the benefits of both approaches. Using relatively few transceivers, SATR-MUSIC is able to resolve objects separated by approximately  in 2D with minimal background artifacts. It does so by averaging TR-MUSIC’s imaging kernel incoherently over the synthetic aperture.

Subwavelength Focussing in Metamaterials Using Far Field Time Reversal

2013 ◽  
pp. 141-168 ◽  
Author(s):  
Mathias Fink ◽  
Fabrice Lemoult ◽  
Julien de Rosny ◽  
Arnaud Tourin ◽  
Geoffroy Lerosey
Keyword(s):  
Time Reversal ◽  
Far Field

Robust far-field subwavelength imaging of scatterers by an acoustic superlens

2019 ◽  
Vol 146 (6) ◽  
pp. 4131-4143
Author(s):  
Yongkang Dong ◽  
Gaokun Yu ◽  
Ning Wang
Keyword(s):  
Far Field ◽  
Subwavelength Imaging

Far-field subwavelength imaging for ultrasonic elastic waves in a plate using an elastic hyperlens

2011 ◽  
Vol 98 (24) ◽  
pp. 241912 ◽  
Author(s):  
Hyung Jin Lee ◽  
Hoe Woong Kim ◽  
Yoon Young Kim
Keyword(s):  
Elastic Waves ◽  
Far Field ◽  
Subwavelength Imaging

scholarly journals Far Field Modeling of Electromagnetic Time Reversal and Application to Selective Focusing on Small Scatterers

2008 ◽  
Vol 69 (3) ◽  
pp. 830-844 ◽  
Author(s):  
X. Antoine ◽  
B. Pinçon ◽  
K. Ramdani ◽  
B. Thierry
Keyword(s):  
Time Reversal ◽  
Far Field ◽  
Field Modeling ◽  
Small Scatterers

scholarly journals A performance predictor of beamforming versus time-reversal based far-field wireless power transfer from linear array

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Hong Soo Park ◽  
Sun K. Hong
Keyword(s):  
Time Reversal ◽  
Power Transmission ◽  
Linear Array ◽  
Wireless Power Transfer ◽  
Far Field ◽  
Power Transfer ◽  
Wireless Power ◽  
Dynamic Propagation ◽  
Received Power ◽  
Indoor Scenarios

AbstractFor far-field wireless power transfer (WPT) in a complex propagation environment, a time-reversal (TR) based WPT that can overcome the drawbacks of conventional beamforming (BF) by taking advantage of multipath has been recently proposed. However, due to the WPT performance of BF and TR depending on the complexity of the propagation environment, the performance prediction between BF versus TR would be required. We present a detailed and generalized analysis of the recently proposed performance metric referred to as the peak received power ratio (PRPR) for linear array-based WPT. Here, the effectiveness of PRPR is verified via measurement for free space and indoor scenarios. The results demonstrate that PRPR is directly related to the complexity of the propagation environment and the corresponding power transmission capability of BF and TR. That is, the higher the complexity, the greater the value of PRPR and TR outperforms BF with higher peak power given the same average transmit power and vice versa. The mode decision between BF and TR based on PRPR potentially promises efficient far-field WPT even in a dynamic propagation environment.

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