Band pass filter

A band pass filter comprising a dielectric block having through holes formed from one surface thereof to another surface opposite to the one surface and a single layered dielectric plate having a front surface and a back surface coupled to the dielectric block such that the back surface faces and directly joins the one surface of the dielectric block, the dielectric block having metallizations formed on all surfaces except the one surface, the dielectric plate having metallizations of predetermined patterns formed on the front and the back surfaces, and the dielectric block and the dielectric plate being made from the same kind of a ceramic material, wherein the dielectric plate has cavities formed on the back surface thereof and the metallizations are formed on inner walls of the cavities.