JPS56119501A - Filter - Google Patents

Abstract

PURPOSE:To facilitate the adjustment of the filter, by putting out both ends of the coupling loop of the coaxial resonator, which has the resonance bar in the box boxy, from the coaxial resonator to adjust the filter. CONSTITUTION:One end of input loop 25 is connected to preceding-stage block 13 on the outside wall of input-side coaxial resonator 22, and the other end of loop 25 is bent into a channel form in resonator 22 and is put out to the outside through the hole provided in the wall and has the tip part bent to approach the metallic box body to form a capacity among loop 25, the tip part, and the box body. In respect to output loop 26, one end is connected to succeeding-stage block 14 provided on the wall of coaxial resonator 24 similarly and is bent into a channel form is resonator 24, and the other end is put out from the box body to the outside, and the tip part is bent to approach the box body, and a capacity is formed between the tip part and the box body. For adjustment of input and output loops, loops 25 and 26 are fixed after other ends of coupling loops are put out or in to change the distance between resonance bar 17 and loops. Since other ends are operated from the external to perform adjustment, the adjusting jig is needless to facilitate adjustment.