Results 71 to 80 of about 777 (161)

Wideband Ultrathin Retrodirective Metasurface Based on Anisotropic Unit Cell

IEEE Open Journal of Antennas and Propagation
A novel wideband ultrathin planar retrodirective metasurface (RMS) is proposed. The structure is composed of anisotropic wideband retrodirective unit cells (WRUs), achieving retroreflection of the TE polarized wave from 6.8 GHz to 8 GHz at 30° of ...
Bang-Feng Chen, Qiang Sun, Yong-Ling Ban
doaj   +1 more source

Investigations of Retrodirective Array Transponders.

, 2003
Retrodirective arrays, when illuminated by an interrogator signal, transmit a signal back towards the interrogator in the same direction as the incoming signal, without any prior knowledge of the source direction.
Shah, Rachana
core  

Backscatter enhanced retrodirective systems

, 2013
The aim of this work is to provide novel solutions for robust radio communication for longer range microwave RFID (Radio Frequency Identification), systems through the use of retrodirective arrays (RDA).
Chan, Pak Long
core  

Retrodirective array based radar (Invited)

, 2010
This paper will demonstrate recent work at Queens University of Belfast as well as review the small body of literature on the new topic of Retrodirective Radar.
Fusco, V.; id_orcid, Buchanan, N. B.
core   +1 more source

Vertical Polarized Helicoid Array With Full Azimuth Beam-Scanning

IEEE Open Journal of Antennas and Propagation
This paper outlines the theory behind helicoid antenna array beamforming and the practical validation on an $8\times 8$ helicoid antenna array. Design, simulation, and measurement are presented at 2.45 GHz.
Yat Hin Chan, Hossein Mardani, Neil Buchanan, Vincent Fusco   +3 more
doaj   +1 more source

Miniaturized Retrodirective Arrays for a Nanosatellite Platform [PDF]

, 2012
Abstract : A retrodirective antenna array (RDA) is capable of autonomously steering its radiation pattern toward the source of an interrogating signal, without having prior knowledge of the interrogator location. Integrating an RDA into a mobile platform, such as a nanosatellite, presents unique challenges due to the platform's restrictions in terms of
Wade G. Tonaki, Reece T. Iwami, Wayne A. Shiroma   +2 more
openaire   +1 more source

Tracking dynamics of retrodirective vehicle RADAR with track hold ability [PDF]

, 2017
This paper considers the tracking dynamics of a retrodirective RADAR when applied to a vehicular scenario. The advantages of such a RADAR system are discussed in comparison to a conventional RADAR.
Ding, Yuan, Buchanan, Neil, Fusco, Vincent; id_orcid, Y. Ding, Buchanan, Neil B., Fusco, Vincent, V. Fusco, Ding, Yuan; id_orcid, N.B. Buchanan   +8 more
core   +2 more sources

Retrodirective Rotman Lens Constraining Factors

, 2012
The mechanism by which a retrodirective Rotman lens operates is examined theoretically and prediction is compared with measurement. By deriving the reflection matrix based on the phase delay relationship between the beam ports and the array ports we show
Cahill, Robert, Jian Zhang, Fusco, Vincent; id_orcid, Steven Christie, Yunhua Zhang, Robert Cahill, Zhang, Yunhua, Christie, S., Vincent Fusco   +8 more
core   +1 more source

An Ultra-Wideband High-Isolation Single-Antenna Full-Duplexer Based on Dual-Phase Cancellation [PDF]

Radioengineering
Wideband transmit–receive shared-antenna full-duplexers are a key technology for radar, communication, and electronic countermeasure systems. In special scenarios such as retrodirective cross-eye jamming, RF systems must adopt a TR shared-antenna ...
J. Xue, B. Su, Y. Liu, L. Zhou, J. Meng
doaj  

Retrodirective arrays interrogated by nonuniform wavefronts [PDF]

, 2010
This thesis presents innovative retrodirective array technology based on inter-element phase-and amplitude detection and amplitude compensation, to increase the performance of RF front-end systems.
Zamora, Alexis
core   +1 more source