TOROIDAL SCANNING LENS ANTENNA Russian patent published in 2000 - IPC

FIELD: radio engineering; communication and radar systems operating in extremely-high and superhigh frequency bands. SUBSTANCE: antenna is designed for annular scanning of beam. It has uniform toroidal lens formed by rotation of circumference about its axis. To form toroidal lens use is made of non-aplanatic focusing geometric profile instead of circumference which has smaller area compared with circumference. Profile may have one refracting side (hyperbolic illuminated or elliptical shadow one) or two refracting sides. Ideal focusing properties of non-aplanatic profile eliminate spherical aberration in uniform toroidal lens which occurs when circumference is used. Eliminating aberration enhances growth of antenna gain. Reduced mass of antenna enables mounting it on flexible posts of mobile communication stations operating in superhigh-frequency bands. Unlimited gain enables, in its turn, increasing radar range in extremely- high frequency band where signal attenuation by propagation medium takes place. EFFECT: reduced mass and unlimited gain of antenna. 2 cl, 9 dwg