PURPOSE: To obtain a microwave filter integrated compactly by coupling electromagnetically a dielectric resonator with a strip line formed on a low dielectric constant board while the dielectric resonator is arranged on the low dielectric board and using the strip line as an input/output line of a microwave.

CONSTITUTION: The dielectric resonator 19 is arranged on the low dielectric constant board 18 to be coupled electromagnetically with the strip line 21 formed on the low dielectric constant board and the strip line is connected directly to the strip circuit 13 of the strip line board 11 on which the microwave filter 16 is mounted. Thus, neither a coaxial connector nor a coaxial cable is inserted between the dielectric resonator and the strip circuit, the matching between the dielectric resonator and the strip circuit is improved, the shape of the microwave filter is made compact and the integration of the microwave filter onto the strip line board is attained.