Patent ID: 7982559
Filing Date: 2011-07-19
Classification: H01P

Abstract:
1. A stripline filter comprising: a dielectric substrate having a top surface, a bottom surface opposite the top surface, and side surfaces connecting the top and bottom surfaces; a ground electrode on the bottom surface of the dielectric substrate; a plurality of resonant lines on the top surface of the dielectric substrate; side surface lines on at least one of the side surfaces of the dielectric substrate and the side surface lines are connected to at least the ground electrode; and an input/output electrode coupled to a resonator formed by a resonant line of the plurality of resonant lines, wherein the plurality of resonant lines include a first resonant line having a U shape in which ends thereof are open and which is interdigitally coupled to second and third resonant lines located on opposed sides thereof, each of the second and third resonant lines has (1) a parallel line part that extends from a base end directly connected to a corresponding side surface line of the side surface lines, in parallel to the first resonant line; and (2) a bent part that extends so as to be bent from an end of the parallel line part, and the bent part of the second resonant line and the bent part of the third resonant line face each other at an interval.