To provide a dielectric filter that obtains a high Q being the special feature of a coaxial type, attains downsizing and a low height by a lamination structure, and includes characteristics of a low loss and a high attenuation amount.
The manufacturing method of the dielectric filter wherein two or more through-holes are formed in a dielectric ceramic includes: laminating and sticking ceramic dielectric green sheets with pressure; forming a plurality of holes penetrated through the laminated sheets at a prescribed interval; cutting off the laminated sheets in a way of including at least two through-holes and dividing them into a plurality of division elements; baking the elements; and forming an inner conductor in the through-holes and forming an outer conductor, a short-circuit conductor and a terminal electrode on the surface of each element.
YAMADA MASANORI
KATO HIROYUKI
MIDORIKAWA TOMOKI
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