Results 121 to 130 of about 533,787 (299)
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 +5 more
doaj +1 more source
Cellular reflectarray antenna and method of making same [PDF]
, 2010 A method of manufacturing a cellular reflectarray antenna arranged in an m by n matrix of radiating elements for communication with a satellite includes steps of determining a delay .phi.m,n for each of said m by n matrix of elements of said cellular ...
Romanofsky, Robert R
core +2 more sources
GENERAL NEAR FIELD SYNTHESIS OF REFLECTARRAY ANTENNAS FOR THEIR USE AS PROBES IN CATR
, 2017 In this work, reflectarray antennas are proposed for their use as probes in compact antenna test ranges. For that purpose, the quiet zone generated by a single offset reflectarray is enhanced, overcoming the limitation imposed by the amplitude taper of ...
D. R. Prado +4 more
semanticscholar +1 more source
Recent Advances in Transparent Reflectarray Antennas
IEEE AccessTransparent Reflectarray Antennas (TRAs) have emerged as a promising solution for next-generation communication systems requiring both electromagnetic performance and optical transparency. This review focuses on a detailed latest work on unit cell design
Altaf Ahmed Mugheri +7 more
doaj +1 more source
Microstrip reflectarray antenna with offset feed
Electronics Letters, 1992 The authors derive and verify the concept of antenna focusing by a planar 'microstrip reflectarray' antenna. Experimental results from schematically distributed patch radiators with microstrip delay lines are consistent with the simulation results. The advantages and disadvantages of such an antenna are described.
D.-C. Chang, M.-C. Huang
openaire +1 more source
Wideband Reflectarray Antennas in the Microwave Range
Известия высших учебных заведений России: РадиоэлектроникаIntroduction. The development of broadband reflectarray antennas for the microwave band remains a key challenge in the context of stricter requirements imposed on telecommunications systems, including 5G/6G networks and satellite communications.
L. М. Liubina +3 more
doaj +1 more source
94 GHz Beam Scanning Dual-Reflector Antenna with a Sub-Reflectarray [PDF]
, 2008 A Cassegrain dual-reflector antenna which employs a flat reflectarray subreflector was analysed in a recent paper [1]. It was shown that the antenna beam can be scanned by introducing an appropriate progressive phase distribution across the reflectarray ...
Arrebola, Manuel +6 more
core
Direct Synthesis of Dual-Parameter Concentric Ring RA with Enhanced Bandwidth
International Journal of Antennas and Propagation, 2012 Reflectarray antennas (RAs) are nowadays a quite popular technology, used in several applications, due to a significant number of attractive properties, such as low cost, low weight, conformal deployment, and the possibility of introducing suitable ...
Bui Van Ha +3 more
doaj +1 more source
Nonreciprocal Wavefront Engineering with Time-Modulated Gradient Metasurfaces [PDF]
, 2019 We propose a paradigm to realize nonreciprocal wavefront engineering using time-modulated gradient metasurfaces. The essential building block of these surfaces is a subwavelength unit cell whose reflection coefficient oscillates at low frequency.
Alvarez-Melcon, A +5 more
core
Three‐dimensional metal‐only phoenix cell and its application for reflectarrays
IET Microwaves, Antennas & PropagationA 3D metal‐only waveguide‐based phoenix cell for reflectarray is presented. The proposed cell consists of two concentric square waveguides and a metallic block in the centre, which offers two operation modes. The first mode uses its cross section to tune
Zhihang An +4 more
doaj +1 more source