NDLI: Enhanced Feeds in Focal Plane Imaging Array Systems: Off Focus Configurations

Content Provider	IEEE Xplore Digital Library
Author	Bonnedal, M. Llombart, N. Neto, A. Gerini, G. De Maagt, P.
Copyright Year	2007
Description	Author affiliation: Saab Space, Gothenburg (Bonnedal, M.)
Abstract	The performances of focal plane arrays that implement multi-beam coverage from a single reflector antenna are usually reduced by conflicting requirements on the feed elements. Dense packing is required to minimize the beam separation, while typically large apertures provide the high feed directivity which in turn translates in low spill over losses from the reflector. In this paper the use of a dielectric super-layer is proposed to shape the radiation pattern of each feed so that the spill over from the reflector is reduced without increasing the dimensions of each aperture. A prototype with 19 wave-guides arranged in a hexagonal lattice has been designed. The simulated embedded patterns provide an increase of the edge of coverage gain, with respect to the free space case, of at least 1 dB in an operating bandwidth of ap 6%. Moreover when a frequency and polarization reuse scheme is adopted the increase in the edge of coverage is 2.1 dB leading to a fully efficient use of the reflector.
Starting Page	253
Ending Page	256
File Size	725261
Page Count	4
File Format	PDF
ISBN	9782874870033
DOI	10.1109/ECWT.2007.4403994
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2007-10-08
Publisher Place	Germany
Access Restriction	Subscribed
Rights Holder	European Microwave Association
Subject Keyword	Focusing Prototypes Lattices Bandwidth Apertures Reflector antennas Antenna feeds Dielectrics Antenna arrays Antenna radiation patterns
Content Type	Text
Resource Type	Article

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