FILTER UND VERFAHREN ZU SEINER HERSTELLUNG

摘要

A filter used for radio communication equipment, whose characteristics are not deteriorated because the no-load Q of the strip line resonator is high. The filter comprises a base (4) having first and second electromagnetically-coupled strip lines (5) and (6) on the front side, and an earth pattern (2) on the reverse side, a dielectric layer (8) stacked on the front side of the base (4), and provided with capacitor patterns (9) and (10) on the front side facing the aforesaid first and second strip lines (5) and (6) with the dielectric layer (8) therebetween; and a metal cap (1) covering the dielectric layer (8). A conduction film which is connected to the earth pattern (2) on the reverse side is provided on a part of the edge of the base (4). At least a part of the outer periphery of the metal cap (1) extends to this conduction film and is connected to it.