Results 241 to 250 of about 533,787 (299)

Reflectarray Antenna at Terahertz Using Graphene

IEEE Antennas and Wireless Propagation Letters, 2013
The use of graphene for fixed-beam reflectarray antennas at Terahertz (THz) is proposed. Graphene's unique electronic band structure leads to a complex surface conductivity at THz frequencies, which allows the propagation of very slow plasmonic modes. This leads to a drastic reduction of the electrical size of the array unit cell and thereby good array
Carrasco-Yepez Francisco-Eduardo, Perruisseau-Carrier Julien   +1 more
openaire   +1 more source

Ultrabroadband and Multipolarized Electrically Reconfigurable Reflectarray Antennas

IEEE Transactions on Antennas and Propagation
In this article a general strategy for designing ultrabroadband and multipolarized electrically reconfigurable reflectarray antennas (RRAs) is proposed.
Jie Tian, Shiyuan Li, Chong He, M. Premaratne, Weiren Zhu, Ji Zhou   +5 more
semanticscholar   +1 more source

Electronically Reconfigurable Reflectarray Antennas Using 2-bit Phase Shift Unit Cells Embedded With Reflecting Circuits

IEEE Transactions on Antennas and Propagation
We present an electronically reconfigurable reflectarray capable of performing 2-D beam-scanning. This reflectarray uses an electronically reconfigurable unit cell, consisting of an antenna and a reflecting circuit that provides a 2-bit reflection phase ...
Jiahao Zhao, Shichen Qiao, H. Topozlu, Jinkai Wu, M. M. Honari, J. Booske, N. Behdad   +6 more
semanticscholar   +1 more source

Design of Ka-band Reflectarray Antennas for High Resolution SAR Instrument

European Conference on Antennas and Propagation, 2020
The design of polarization selective reflectarrays for high resolution and wide swath SAR instrument in Ka-band is presented. The antenna system consists of nine dual-offset reflectarray panels, each with the size of $1.5\mathrm{m} \times0.55\mathrm{m}$.
Min Zhou, M. Palvig, S. Sorensen, J. Lasson, D. Alvarez, M. Notter, D. Schobert   +6 more
semanticscholar   +1 more source

Broadband Optimization of Reflectarray Antennas

2019 International Conference on Microwave and Millimeter Wave Technology (ICMMT), 2019
This paper presents the broadband design method for reflectarray (RA) antennas. The differential evolution (DE) algorithm has been applied to balance the spatial phase delay errors in the whole work band. A RA antenna consisted of split ring elements has been proposed to validate the method.
Yu Jianfeng, Cao Jun, Zhang Xiaogang
openaire   +1 more source

Reflectarrays antennas for SAR missions

11th International Symposium on Antenna Technology and Applied Electromagnetics [ANTEM 2005], 2005
Three distinct applications have been described which show the interest of reflectarray antennas for SAR missions in X band.
Herve Legay, Beatrice Salome, Etienne Girard, Sophie Ramongassie, Jose Encinar, Giovanni Toso   +5 more
openaire   +1 more source

An Amplifying Reconfigurable Reflectarray Antenna

IEEE Transactions on Antennas and Propagation, 2012
Electronically tunable reflectarrays and amplifying reflectarrays have attracted considerable research in recent years, however, little work has been done to combine these two features simultaneously in a single design. This paper focuses on the design of such a reflectarray, which can be used as a high gain, reconfigurable transmitting antenna for ...
Krishna Kumar Kishor, Sean Victor Hum
openaire   +1 more source

Reflectarray Antennas for Independent Dual Linear and Circular Polarization Control

IEEE Transactions on Antennas and Propagation, 2019
This paper presents a dual-polarization reflectarray unit cell for wideband applications based on stacked Jerusalem crosses with a quarter-wavelength cell period.
Ciaran Geaney, M. Hosseini, S. Hum
semanticscholar   +1 more source

Dual-Frequency Folded Reflectarray Antenna

IEEE Antennas and Wireless Propagation Letters, 2013
Design and experimental results of a dual-frequency folded reflector antenna are presented. With an effective diameter of 180 mm and a depth of 60 mm, gain values of 25 and 30 dB at 20 and 30 GHz, respectively, have been achieved. Beamwidths are 6.2° at 20 GHz and 3.7°/4° at 30 GHz.
Jinjing Ren, Wolfgang Menzel
openaire   +1 more source

Patents on Reconfigurable Reflectarray Antennas

Recent Patents on Electrical Engineeringe, 2009
Reflectarray antennas have attracted significant attention due to a number of attractive properties, such as low cost, and conformal deployment capability. In addition, the drive towards flexible radio transceivers, enabling beamforming and multi-beam operation has spurred significant interest towards the design of antenna elements and antenna arrays ...
Apostolos Georgiadis, Ana Collado, Julien Perruisseau-Carrier   +2 more
openaire   +1 more source