Patent ID: 6677837
Filing Date: 2004-01-13
Classification: H01P

Abstract:
A dielectric waveguide filter comprising a plurality of dielectric waveguide resonators in the form of rectangular parallelepiped-shaped blocks aligned as a single main body having opposite ends defined by respective the end blocks located thereat, and a pair of input and output electrodes provided in said end blocks, respectively, said main body having an outer surface including a bottom surface, said dielectric waveguide filter being characterized in that:each of said end blocks is formed with a protruding portion including a dielectric substance extended from that therein, said protruding portion having an outer surface including a bottom surface and an end surface extending upward from the edge of said bottom surface; each of said input and output electrodes is defined by a conductive strip line extending from the bottom surface of corresponding one of said end blocks to the edge region of the bottom surface of corresponding one of said protruding portions, wherein said bottom surfaces have a region where said dielectric substance in contact with the both sides of said conductive strip line is exposed to outside; the end surface of said protruding portion has a region where said dielectric substance in contact with said conductive strip line is exposed to outside; and the outer surfaces of said main body and said protruding portions is covered with a conductive film excepting said regions where the dielectric substance in contact with said conductive strip line is exposed to outside.