Results 81 to 90 of about 140,738 (213)

Single-Layer Quad-Band Printed Reflectarray Antenna with Dual Linear Polarization

A novel single layer, dual linear polarized unit cell is introduced for a quad-band reflectarray antenna in the Ku-band centered around 12, 13, 14, and 15.5 GHz.
Peixeiro, Custodio, Hasani, Hamed, Skrivervik, Anja, Perruisseau-Carrier, Julien   +3 more
core   +1 more source

CP metasurfaced antennas excited by LP sources [PDF]

, 2012
A metasurface which is considered as a polarizer for microwave antennas is proposed in this paper. Preliminary results have shown that circularly polarized (CP) radiation can be obtained from linearly polarized (LP) source antennas with the use of ...
T. I. Yuk, Zhu, Hailiang, S. W. Cheung, Cheung, SW, Cheung, S. W., Zhu, H, Chung, Kwok L. (R17316), Chung, KL, Hailiang Zhu, Yuk, TI, X. L. Sun, Kwok L. Chung, Yuk, Tong I., Sun, X, Sun, X. L.   +14 more
core   +1 more source

Reflectarray antennas for terahertz communications

, 2012
Reflectarrays composed of resonant microstrip gold patches on a dielectric substrate are demonstrated for operation at terahertz frequencies. Based on the relation between the patch size and the reflection phase, a progressive phase distribution is implemented on the patch array to create a reflector able to deflect an incident beam towards a ...
Niu, Tiaoming, Withayachumnankul, Withawat, Ung, Benjamin S. -Y., Menekse, Hakan, Bhaskaran, Madhu, Sriram, Sharath, Fumeaux, Christophe   +6 more
openaire   +2 more sources

Principle of Bifocal Antennas Implemented in a Dual Reflectarray Configuration

, 2015
A procedure to compute the phase distribution on dual reflectarray antennas applying the principle of bifocal antennas is proposed. Two different approaches have been used for centered and offset configurations.
Encinar Garcinuño, José Antonio, Tienda Herrero, Carolina, Guevas Castillo, Jesús Gustavo, Encinar, Jose Antonio, Cuevas Castillo, Jesus Gustavo, Krieger, Gerhard   +5 more
core  

Enhanced signal coverage in Metropolitan areas using slotted square reflectarray antennas

Journal of Engineering and Applied Science
Efficient wireless communication in densely populated urban environments often encounters challenges related to signal propagation, especially in indoor and obstructed settings.
V. Narasimha Nayak, Nageswararao Naik Bhookya, G. Challa Ram, Chavvakula Janaki Devi, Manumula Srinubabu, Aylapogu Pramod Kumar, M. Venkateswara Rao   +6 more
doaj   +1 more source

Tunable Liquid Crystal Based Phase Shifter with a Slot Unit Cell for Reconfigurable Reflectarrays in F-Band

Applied Sciences, 2018
An electrically tuned phase shifter based on the single slot unit cell and liquid crystal for a reconfigurable reflectarray antenna was presented. The simulation and measured results obtained at the F-band were used to demonstrate that the dielectric ...
Sheng Gao, Jun Yang, Peng Wang, Andong Zheng, Hongbo Lu, Guangsheng Deng, Weien Lai, Zhiping Yin   +7 more
doaj   +1 more source

Fractal Reflectarray Antennas: State of Art and New Opportunities

International Journal of Antennas and Propagation, 2016
Fractal geometries are appealing in all applications where miniaturization capabilities are required, ranging from antennas to frequency selective surfaces (FSS) design.
S. Costanzo, F. Venneri, G. Di Massa, A. Borgia, A. Costanzo, A. Raffo   +5 more
doaj   +1 more source

Loss mechanisms of folded reflectarray antennas

, 2010
Folded reflectarray antennas can provide a good solution for millimeter-wave systems requiring compact, low-cost antennas, e.g. in automotive applications.
Dieter, S., Menzel, W., Li, J., Keyrouz, S.   +3 more
core  

Review of Wideband Passive Reflectarray Antennas

IEEE Access
Reflectarray antennas (RAs) combine the high gain and low-loss space feed of reflectors with the per-element phase control of phased arrays, but their resonant, path-length-dependent operation makes bandwidth their principal limitation.
Reza Shamsaee Malfajani, Ahmed A. Kishk
doaj   +1 more source

Multi-band reflectarray antennas in Ku and THz frequency bands [PDF]

, 2015
Printed reflectarrays are low-cost, low-profile high gain antennas demonstrating distinctive advantages over conventional parabolic reflectors and phased-arrays. The flat, low weight reflecting surface of a reflectarray makes it an attractive alternative
Hasani, Hamed
core   +2 more sources