Abstract
Recent work on dual-reflector antennas involving reflectarrays is reviewed in this paper. Both dual-reflector antenna with a reflectarray subreflector and dual-reflectarrays antennas with flat or parabolic main reflectarray are considered. First, a general analysis technique for these two configurations is described. Second, results for beam scanning and contoured-beam applications in different frequency bands are shown and discussed. The performance and capabilities of these antennas are shown by describing some practical design cases for radar, satellite communications, and direct broadcast satellite (DBS) applications.
Highlights
Dual-reflector antennas are used to reduce the crosspolarization and the overall antenna volume in many applications, in space applications
In [4], the beam scanning performance of an antenna made of a 1.5 m aperture parabolic reflector and a rectangular subreflectarray (520 mm × 494 mm) at 11.95 GHz was studied in an angular range of ±2◦ from the antenna boresight
A highgain beam-scanning antenna based on a flat subreflectarray and a main parabolic reflector has been studied
Summary
Dual-reflector antennas are used to reduce the crosspolarization and the overall antenna volume in many applications, in space applications. It can provide a broad-band performance for large apertures, by using a reflectarray subreflector of small electrical dimensions and a large parabolic reflector This dual-reflector configuration can be used to scan or reconfigure the beam by electronically controlling the phaseshift at the elements of a limited-size subreflectarray [4]. A dual-reflectarray antenna comprising a parabolic main reflectarray can be used to provide beam shaping in a broad band [11] These antenna configurations including a controllable reflectarray subreflector can present a great potential in several space applications, such as Synthetic Aperture Radar (SAR), remote sensing, and reconfigurable antennas for direct broadcast satellites (DBSs). This aspect is a real need in telecommunications and DBS missions, since the demand in data traffic (TV broadcast, phone, video or data transmission, multimedia direct-to-home, etc. . ..) can change during the 15–20 year lifetime of the satellites
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