Fujitsu Corporation

Yukio Ito

Takeshi Meguro

Bun-ichi Miyamoto

A comb-line type dielectric filter in which a plurality of resonator holes are made in a dielectric block at predetermined intervals and coupling adjustment holes are made between the resonator holes, the interior surfaces of the resonator holes and the surface of the dielectric block being entirely or partly covered with a conductor film. The coupling adjustment holes are disposed apart from the line joining the centers of the resonator holes, and a coupling adjusting member made of metal or dielectric material is inserted into each coupling adjustment hole.

Dielectric filter

A dielectric filter module having an open housing which supports screws for adjusting the characteristics of the dielectric filter. The dielectric filter, which includes an elongated dielectric block having internal cavities and a conductive film extending from the exterior surface of the block into the internal cavities, is mounted in an openended metal housing which surrounds three sides of the dielectric filter. Suitable housings can be inexpensively fabricated to the necessary length from segments cut from commercially available channel members having C-shaped or I-shaped cross-sections. Wires extend through the open ends of the housing to connector elements on the surface of the block adjacent its ends. The connector elements can be adhesively secured metal members or locally deposited regions of metallic film. Either threaded holes on the housing or nut members mounted on the housing can be used for supporting the adjustment screws.

Dielectric filter module

A dielectric filter in which a plurality of holes are made at predetermined intervals in a dielectric block of small dielectric loss, and a conductor film is formed on the surface of the dielectric block including the interior surfaces of the holes to constitute resonators using the conductor film on the interior surface of each hole as an inner conductor of the resonator and the conductive film on the outer peripheral surface of the dielectric block as an outer conductor, the resonance frequency of the resonators being based on the depth of each hole.

Growing community of inventors

Kawasaki, Japan

Yukio Ito