Kyocera Corporation

Hiroshi Kuroki

Kenji Kitazawa

Hiroyuki Mori

Yoshifumi Yamagata

Yoshihiro Miyawaki

Youichi Yamashita

A high-frequency module has a structure wherein transmitting filters, receiving filters and high-frequency power amplifiers are mounted on a multilayered substrate and wherein matching circuits are inserted between input terminals of the receiving filters and output terminals of the transmitting filters. Transmission lines as components of the matching circuits, and the like are formed internally of the multilayered substrate. Thus, the whole body of the high-frequency module can be downsized.

High-frequency module and communication apparatus

A dielectric filter comprises a first resonator and second resonator. Each of the resonators includes a dielectric block having a through-hole, an inner conductive layer placed on the inner surface of the through-hole, and an outer conductive layer placed on the outer surface of the dielectric blocks. The first and second resonators have a coupled hole extending transversely to the through-holes in portions of the resonator couples adjacent to each other. The dielectric filter may further include a frame made of a pair of metal plates covering said coupling hole. The pair of metal plates have legs for earthing and are affixed to the filter body, whereupon the metal plates are located, apart from each other. A method for producing a dielectric filter comprises the steps of making a filter body by connecting a first resonator and second resonator; providing a pair of lead frames incorporating a plurality of metal plates; disposing said filter body between said metal plates of the pair of lead frames; and fixing the metal plates to opposite sides of the filter body.

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Kokubu, Japan

Hiroshi Kuroki