PURPOSE: To make effective dielectric constant of dielectrics of each resonator to coincide with each other, by changing a position of a hole for adjusting degree of coupling in a distributed constant type filter.
CONSTITUTION: In giving a deviation to a conventional coupling adjusting hole 54 toward the resonator 51 and a conventional coupling adjusting hole 55 toward the resonator 53, the conventional effective dielectric constants eff1 and eff2 are changed respetively to eff1' and eff2' (eff1>eff1', eff2<eff2') and a position obtaining eff1'=eff2' exists. The coupling adjusting holes provided at this position are 54', 55'. The effective dielectric constants of the dielectrics of resonators 51∼53 are made to coincide by changing the position of the coupling adjusting holes in this way.
TAMURA SADAHIRO
TAMURA HIROSHI
| JPS5717201A | 1982-01-28 |