PLANE COLLAPSIBLE DOUBLE-INPUT ANTENNA Russian patent published in 1999 - IPC

FIELD: transceiving equipment of radio-communication systems including space communication and television systems. SUBSTANCE: antenna has two antenna panels with alternating rectangular and U-shaped radiating waveguides for transmitting and receiving channels, respectively, provided with transverse and longitudinal slots, respectively. Dumbbell-shaped transverse slots are fed in traveling- wave mode by pairs of asymmetric capacitive diaphragms placed on opposite wide walls of rectangular radiating waveguide. Changing magnetic field position every half-wave is effected by reversing shift sign of capacitive-diaphragm pairs which provides for in-phase excitation of all dumbbell-shaped radiating slots. Changing diaphragm size ensures single-ended matching of each slot and distribution of slot excitation intensity decaying to ends, as well as desired level of directivity pattern side lobes of antenna. Rectangular radiating waveguides are fed in their center through longitudinal dumbbell- shaped slots coupled with rectangular waveguide feeds of same width which are combined by E-adders placed on second tier of antenna panel. Longitudinal radiating slots are alternately shifted towards two side walls of U-shaped radiating waveguide. Single-ended matching of each longitudinal slot is provided by asymmetric capacitive and inductive diaphragms as well as by slot on partition edge. U-shaped radiating waveguide is fed from rectangular waveguide feed through transverse dumbbell slot and partition slot. Waveguide feeds and transverse feeding slots are combined by E-adders placed on second tier of antenna panel. E-adders of transmitting and receiving channels are combined by series T-junctions. When collapsed, antenna panels are arranged one on top of other. In working position, they are placed on same plane immediately adjacent to each other. EFFECT: improved level of directivity pattern side lobes. 17 dwg