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.