Patent ID: 6809615
Filing Date: 2004-10-26
Classification: H01P

Abstract:
A band-pass filter comprising a dielectric filter including:electrodes formed on both upper and lower surfaces of a substantially rectangular dielectric plate; a first plurality of substantially rectangular non-electrode portions which are adjacent to each other and formed in the electrode on the upper surface of the dielectric plate; and a second plurality of substantially rectangular non-electrode portions formed in the electrode on the lower surface of the dielectric plate and opposing a respective non-electrode portion of the first plurality of non-electrode portions so as to form a plurality of resonators in regions confined by the opposing non-electrode portions, wherein at least some of the plurality of resonators other than input- and output-stage resonators are n&lgr;/2 resonators, where &lgr; denotes one wavelength and n is an integer more than one, and wherein the plurality of resonators include a first group of adjacent resonators which are capacitively coupled, and a second group of adjacent resonators which are inductively coupled.