FREQUENCY CONVERTER FOR SATELLITE COMMUNICATION WITH BUILT-IN TRANSMISSION BAND INHIBITING FILTER

摘要

PROBLEM TO BE SOLVED: To suppress the transmission wave with a simple configuration and to prevent the suppression of the gain and the deterioration of the noise figure due to the transmission wave. SOLUTION: A shoulder 8 is formed around the opening 4 of a wave guide 1 and the rim of a filter plate 9 is fixed to the shoulder 8 by crimping or the like. The filter plate 9 exhibits the property of inhibiting the transmission wave in a two-way satellite communication system and the entrance of the transmission wave into the wave guide 1 is reliably inhibited. In this way, the suppression of the gain of a circuit formed on a circuit board 3 and the deterioration of the noise figure by the transmission wave can be prevented.