HIGH FREQUENCY WAVE FILTER USING RESONATOR OF UNEVENNESS STRUCTURE

摘要

PURPOSE: A high frequency wave filter is provided to easily insert a parallel or serial capacitance into a resonator and to easily correct errors for improving property of the filter at low band, to miniaturize the filter and to simplify a fabrication process, thereby decreasing fabrication cost. CONSTITUTION: A number of grooves formed on upper plane of a dielectric block(10) in the length direction. A number of resonators(16) is formed by plating a predetermined part of the lower part of each groove with a conductive material and resonates an external input signal. A ground electrodes(11) is formed by plating a predetermined part of the outer wall of the dielectric block(10) with a conductive material and is shorted electrically to a printed circuit board. An input electrode(12) is formed on a predetermined part, where is not plated, of the dielectric block(10) and receives an external signal. An output electrode(13) is formed on a predetermined part, where is not plated, of the dielectric block(10) and outputs a signal. A first non-plating block(15) is formed at periphery of the input and output electrodes(12,13) and prevents the input and output electrodes from being shorted electrically to the ground electrode(11), and couples capacitively the input and output electrodes(12,13) and the adjacent resonators(16).