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A novel single layer, dual-polarization reflectarray is proposed to operate at transmit (30 GHz) and receive (20 GHz) frequencies for Ka-band terminal antennas. The proposed reflectarray antenna is based on a unit cell with several resonant elements of adjustable length printed on the same side of a conductor backed substrate. Crossed dipoles and truncated rectangular rings are used to adjust the...
This paper describes the accurate characterization of the reflection coefficients of a multilayered reflectarray element by means of artificial neural networks. The procedure has been tested with different RA elements related to actual specifications. Up to 9 parameters were considered and the complete reflection coefficient matrix was accurately obtained, including cross polar reflection coefficients...
This work presents the recent developments of reflectarray antennas for space applications carried out by Universidad Politecnica de Madrid, which includes analysis and design techniques for single and dual reflector configurations, design procedures for contoured beams and bandwidth improvement and some practical realizations. Several reflectarray demonstrators are described for Direct Broadcast...
The design of a reflectarray for satellite applications is accomplished in this letter. The use of full-wave electromagnetic methods to compute the reflectarray elements in the design process has been replaced by the characterization of the reflectarray elements by artificial neural networks (ANNs). The antenna is designed to provide coverage in Ku-band to a European region defined by EuTELSAT. The...
In this paper, a dual-reflectarray antenna is proposed to generate a contoured beam for a DBS European coverage. The antenna optics is based on a compact range dual-reflector antenna, which produces low crosspolar radiation. The phase distribution of the subreflectarray is defined to simulate an equivalent hyperbolic subreflector with negative eccentricity. The phase distribution on the main reflectarray...
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