Fuji Electrochemical Co., Ltd.

Fujitsu Corporation

Shigemitsu Suzuki

Kazuhisa Yamazaki

Junji Konda

Hiroyuki Sogo

Yasuyuki Kondo

A dielectric resonator with a dielectric block. The block has a plurality of resonance apertures and coupling-prevention aperture between the adjacent resonance apertures within the block. The block is entirely coated with a conductive film except a limited portion around the one end of the resonance apertures.

Dielectric filer having a decoupling aperture between coaxial resonators

A dielectric resonator block has at least three resonators and coupling device for coupling the adjacent resonators. A reactance element is added in parallel to the coupling device to provide an attenuation pole. A capacitor block of a dielectric material is provided which has through-holes to form hole electrodes and a surface electrode so that two coupling capacitances are provided. One of the two coupling capacitances serves as the reactance element. One of the hole electrodes of the capacitor block is connected with an external connector, and the other hole electrodes are connected with the resonators.

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Hamamatsu, Japan

Shigemitsu Suzuki