Patent Number: 6,480,701

Title: Composite filter, duplexer and communication apparatus

Abstract: The invention provides a composite filter comprising: a single unitary dielectric block having an outer conductor on the external surfaces thereof; a plurality of inner conductors disposed in the dielectric block; a plurality of filters with different frequencies respectively comprising resonators made of at least one of said inner conductor; a first portion of said dielectric block constituting at least one of said filter comprising a first dielectric material; a second portion of said dielectric block constituting the other one of said filter comprising a second dielectric material; and the dielectric constant of said first dielectric material and said second dielectric material being different from each other.

Inventors: Yonekura; Hiroshi (Yokaichi, JP), Miyamoto; Hirofumi (Kanazawa, JP), Mouri; Hisashi (Yokaichi, JP), Sougoya; Shinichi (Ishikawa-ken, JP), Nakamura; Soichi (Ishikawa-ken, JP)

Assignee: Murata Manufacturing Co., Ltd.

International Classification: H01P 1/213 (20060101); H01P 1/20 (20060101); H04B 001/44 (); H04B 001/56 (); H01P 001/12 ()

Expiration Date: 11/12/2019