MULTI-MODE SQUARE HORN WITH CAVITY-SUPPRESSED HIGHER-ORDER MODES

摘要

An antenna apparatus that has an increased efficiency, and a method forincreasing the efficiency of multi-mode antenna feed horns, is disclosed. Themethodcomprises the steps of exciting, within the antenna, a desired transmissionmode and anundesired transmission mode of the signal to be transmitted, and converting,within theantenna, power within the undesired transmission mode into power for thedesiredtransmission mode of the signal to be transmitted. An antenna apparatus inaccordancewith the present invention comprises a feed horn having an input opening, anaperture,and a cavity, disposed between the input opening and the aperture, forsuppressing anundesired transmission mode of the antenna and exciting a desired transmissionmode ofthe antenna.