Murata Manufacturing Co., Ltd.

Yuki Nakaike

Kengo Onaka

Katsuhito Kuroda

Reiji Nakajima

Yuko Fujita

Kenji Matsuda

A front end circuit includes a circulator having a first port into which a transmission signal is input, a second port into/from which a transmission/reception signal is input/output, and a third port from which a reception signal is output. The impedance of the second port of the circulator is set to a value different from the impedance value of the first port and the third port. With his configuration, the narrowing of a frequency band and the increase in loss, which occur when an impedance matching circuit is additionally provided, are prevented.

Front end circuit and communication apparatus

In a non-reciprocal circuit element, electric power handling capability is improved, and leakage power between adjacent channels is reduced. In addition, balance is taken between reduction of noise between adjacent ports and an increase in insertion loss. A non-reciprocal circuit element includes a YIG ferrite () and a plurality of conductors () disposed on the YIG ferrite () and intersecting each other in an insulated state. A part of Y of the YIG ferrite () is substituted with at least any one element of Ho, Dy, and Gd, or a part of Fe of the YIG ferrite () is substituted with Co.

Growing community of inventors

Kyoto, Japan

Yuki Nakaike