A theoretical design of a Ku-band multibeam offset bifocal reflector antenna (BFRA) with 40° field of view (FoV) suitable for satellite ground station applications is presented and discussed. The BFRA has a nearly square aperture with a dimension of about 4.5 m (191 wavelengths at a frequency of 12.75 GHz) and was designed for the required scan angle α = 18°. The antenna has a Gregorian configuration in the offset vertical plane and a Cassegranian configuration in the scanning horizontal plane. This BFRA was designed for a special application for which providing the maximum aperture efficiency (i.e., the maximum gain) is required and relatively high sidelobes are allowed. Calculated aperture efficiency is greater than 52% and a directivity is about 54 dBi at 12.75 GHz within the whole FoV of 40° (which is equal to 100 beamwidths) in the scanning plane.Index Terms-Aperture efficiency, bifocal reflector antennas, multibeam antennas, satellite communication Earth terminals.

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The paper describes the principles of constructing antennas for the Earth remote sensing synthetic aperture radar (SAR) systems mounted on the small spacecrafts and based on the truss-type deployable reflector antennas developed by JSC "OKB MEl". The basis of reflectors is a rigid truss framework. Metallic mesh grid playing the role of reflecting surface is attached to this frame work. The possibility of providing electronic beam scanning with a small step for ScanSAR mode is realized by the usage of complex feed, consisting of an array of antennas, microwave switches and power divider. Two S-band SAR deployable reflector systems de signed for Russian and Chinese small spacecrafts are presented. PACKPbIBAK)L1WIEC� 3EPKAIlbHbiE AHTEHHblE CVlCTEMbl Cl>EPMEHHOrO TVinA .QIl� PCA, PA3MELUAEMbiX HA MAIlblX KOCM�4ECKVlX AnnAPATAX Ye60TapeB A. C., naHTeneeB B. A., e�3ynna H. M., MvnpocpaHoB E. M., nnaCH1KoB A. H. OA 0 «Oco6oe KOHcmpYKmopCKoe 61Opo MocKoBcKoao 3HepaemUlJeCKOaO uHcmumyma» (OA 0 «OKS M3t1») yn.