Results 41 to 50 of about 300,396 (142)

Planar Beam Steerable Parasitic Array Antenna System Design Based on the Yagi‐Uda Design Method

International Journal of Antennas and Propagation, Volume 2019, Issue 1, 2019., 2019
A planar beam steerable array antenna system is proposed with dual‐control circuits for feeding and reactive loadings. Two orthogonally arranged planar dipoles are excited by SPDT switching circuits, while the forward and backward beam directions are controlled by the adjusted effective electric lengths of the parasitic dipole elements.
Seok-Jae Lee, Won-Sang Yoon, Sang-Min Han, Hervé Aubert   +3 more
wiley   +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

Tolerance Analysis and Robustness of Phase Conjugating Cross‐Eye Jamming

IET Radar, Sonar &Navigation, Volume 19, Issue 1, January/December 2025.
This study explores phase‐conjugating (PC) arrays as a robust alternative to Van Atta (VA) arrays for cross‐eye jamming, a radar countermeasure in electronic warfare, developing an analytical framework validated by simulations. It demonstrates PC arrays' superior tolerance to phase errors and lower minimum JSR requirement against skin return.
Vittorio Calligaris, Pierfrancesco Lombardo   +1 more
wiley   +1 more source

A Microstrip Second‐Iteration Square Koch Dipole Antenna for TT&C Downlink Applications in Small Satellites

International Journal of Antennas and Propagation, Volume 2017, Issue 1, 2017., 2017
A microstrip second‐iteration square Koch dipole fractal antenna is presented. This meandered antenna has a total length of 56.56 cm including its feed gap and was printed on the diagonal of a 100 mm × 100 mm PCB card that acts as CubeSat face. The antenna that was designed to optimize space shows acceptable performance at its resonance frequency of ...
Jorge Simón, José Luis Alvarez-Flores, Juvenal Villanueva-Maldonado, Víctor Hugo Castillo-Topete, Leonel Soriano-Equigua, Jorge Flores-Troncoso, Herve Aubert   +6 more
wiley   +1 more source

Performance Aspects of Retrodirective RFID Tags

Engineering Proceedings
Although RFID(radio frequency identification) tags do not require a direct line of sight, their operational range is often characterized as being limited.
Theodoros N. F. Kaifas
doaj   +1 more source

Circularly Polarized Retrodirective Antenna Array for Wireless Power Transmission [PDF]

IEEE Transactions on Antennas and Propagation, 2020
A retrodirective antenna (RDA) array for wireless power transmission (WPT) is presented. Applications include the wireless charging of mobile phones and other handheld devices. The reported RDA defines an active high-power transmitter module that retrodirects a received beacon tone back to a mobile unit by circularly polarized (CP) free-space radiation.
Pascual D. Hilario Re, Symon K. Podilchak, Samuel A. Rotenberg, G. Goussetis, Jaesup Lee   +4 more
openaire   +2 more sources

Platform echo and cross‐eye jamming against active‐passive composite monopulse radars

IET Radar, Sonar &Navigation, Volume 18, Issue 11, Page 2134-2143, November 2024.
In this paper, platform echo and cross‐eye jamming signals are jointly considered to analyse the jamming performance on active‐passive composite monopulse radars (APCMR). In order to ensure the jamming performance on both active and passive radars in APCMR, a guideline for the setting of jammer parameters is proposed based on numerical simulations ...
Dong Li, Yongcai Liu, Liang Zhou, Binbin Su, Jin Meng   +4 more
wiley   +1 more source

The Implementation of Wide Angle and UWB Retrodirective Performance Based on Non-Uniformly Spaced Van Atta Array

IEEE Access
This paper presents the design, simulation, fabrication, and measurement of a broadband $1\times 16$ Non-Uniform Van Atta Array (NUVAA) retrodirective antenna array based on compact Vivaldi elements.
Mahdi Rahanandeh Lafmejani, Bijan Zakeri, Amir Saman Nooramin   +2 more
doaj   +1 more source

SATCOM Retrodirective Array [PDF]

, 2016
We present an in depth look at the challenges involved in using analogue retrodirective arrays for satellite communications. The main technical issues surrounding the development of a retrodirective (self-steering) Satellite Communications (SATCOM ...
van der Vorst, Maarten, Fusco, Vincent F; id_orcid, Buchanan, Neil B   +2 more
core   +1 more source

Channel estimation for backscatter communication systems with retrodirective arrays

IET Communications, Volume 18, Issue 11, Page 671-678, July 2024.
Here, the authors consider the tag is equipped with retrodirective arrays to improve reliability and enhance communication range. The probability density function of channel coefficients is then derived. Next, a channel estimator based on Bayesian theory is proposed to acquire the modulus values of channel parameters and calculate its Bayesian Cramer ...
Yunping Mu, Chaochao Yao, Dian Fan, Yongjun Xu, Gongpu Wang, Marjan Milošević, Bo Ai   +6 more
wiley   +1 more source