DISTRIBUTION COUPLED CIRCUIT

摘要

PURPOSE:To increase the band of a filter which uses a distribution coupled circuit and to obtain a large impedance ratio by empolying the same photoetching technique and increasing the degree of coupling of a parallel coupled line greatly. CONSTITUTION:One input/output line (i.e. part of a resonator) 31 is divided into projecting parts 33 and 34 having narrow line width. The other line 32 is divided into projecting parts 35 and 36. They are set in parallel and adjacent projecting parts 33 and 35, and 34 and 36 form parallel coupling part consitution which has coupling length lambdag/4 and coupling intervals S1 and S2. When S1= S2