Results 11 to 20 of about 716,699 (142)

A Complete System of Wireless Power Transfer Using a Circularly Polarized Retrodirective Array [PDF]

Journal of Electromagnetic Engineering and Science, 2020
A complete system of wireless power transfer using a circularly polarized retrodirective array is presented. A dual frequency, active retrodirective array is proposed for a transmitter system.
Mohammad Fairouz, Mohammad A. Saed
doaj   +2 more sources

A Tri‐Functional Active Reconfigurable Retrodirective Array

IET Microwaves, Antennas &Propagation, Volume 20, Issue 1, January/December 2026.
This paper presents a broadband active reconfigurable retrodirective array system operating from 6.4 to 11.2 GHz, which integrates a filtering magneto‐electric dipole antenna with inherent out‐of‐band suppression and a function‐switching network to support three modes: absorption, active retrodirective array and active phased array.
Xiang Wang, Lanjun Sun, Jin‐Dong Zhang, Huangyan Li, Boyu Sima   +4 more
wiley   +2 more sources

Spectral signature secured retrodirective array [PDF]

IET Microwaves, Antennas & Propagation, 2016
A novel retrodirective array (RDA) architecture is proposed which utilises a special case spectral signature embedded within the data payload as pilot signals. With the help of a pair of phase‐locked‐loop based phase conjugators the RDA's response to other unwanted and/or unfriendly interrogating signals can be disabled, leading to enhanced secrecy ...
Fusco, Vincent, Ding, Yuan, Buchanan, Neil   +2 more
openaire   +4 more sources

Overview on the Phase Conjugation Techniques of the Retrodirective Array [PDF]

International Journal of Antennas and Propagation, 2010
This paper presents an overview on the phase conjugation techniques of the retrodirective antenna array. The concepts, advantages, and disadvantages of phase conjugation techniques are introduced.
Lei Chen, Yu Chun Guo, Xiao Wei Shi, Tian Ling Zhang   +3 more
doaj   +2 more sources

An Active Beam‐Reconfigurable Retrodirective Array

Nanophotonics
ABSTRACT Retrodirective arrays can scatter an arbitrarily incident wave back along its incident direction, demonstrating significant potential for wireless communications. However, traditional retrodirective arrays can only reflect incident waves back along a fixed direction.
Wen Yue Wei, Yan Shi, Li Jing Yang, Jun Wei Wu, Qiang Feng, Long Li   +5 more
openaire   +2 more sources

Improvement of RF Wireless Power Transmission Using a Circularly Polarized Retrodirective Antenna Array with EBG Structures

Applied Sciences (Switzerland), 2018
This paper presents the performance improvement of a circularly polarized (CP) retrodirective array (RDA) through the suppression of mutual coupling effects. The RDA is designed based on CP Koch-shaped patch antenna elements with an inter-element spacing
Son Trinh-Van, Kang-Yoon Lee, Keum Cheol Hwang   +2 more
exaly   +3 more sources

Retrodirective Antenna Array Using High Frequency Offset

Radioengineering, 2012
The paper deals with the design of a simple retrodirective antenna array exhibiting by high frequency offset between received and transmitted wave. Analysis of the beam pointing error using antenna array model developed in MATLAB is described.
P. Sindler, M. Pokorny
doaj   +1 more source

Dual-mode retrodirective/phased array

Electronics Letters, 2009
A method for producing a retrodirective (self-tracking) antenna, which can also be operated as a phased (selectively pointed) array through the addition of a simple switching circuit and DC bias offset adjustment, is presented. Phase adjustment to individual antenna elements is shown to be readily carried out by a simple frequency pushing technique ...
Fusco, Vincent, Buchanan, Neil
openaire   +3 more sources

Channel estimation for backscatter communication systems with retrodirective arrays

IET Communications
Abstract Backscatter communications, which originated from World War II, have been widely applied in the logistics domain, and recently attract emerging interest from both academic and industrial circles. Here, the backscatter communication systems equipped with retrodirective arrays that can re‐transmit the impinging signals back ...
Yunping Mu, Chaochao Yao, Dian Fan 0001, Yongjun Xu 0002, Gongpu Wang, Marjan Milosevic, Bo Ai 0001   +6 more
openaire   +4 more sources

Ka-Band Rotman Lens-Based Retrodirective Beamforming System for Wireless Power Transfer [PDF]

Journal of Electromagnetic Engineering and Science, 2021
A retrodirective beamforming system (BFS) based on a Rotman lens is proposed for far-field wireless power transfer at Ka-band. The true-time-delay property of the Rotman lens allows for a wideband operation covering 28–38 GHz.
Hayoung Hong, Hongsoo Park, Kanghyeok Lee, Wonwoo Lee, Semin Jo, Junhyuk Yang, Changkun Park, Hojin Lee, Sun K. Hong   +8 more
doaj   +1 more source