Murata Manufacturing Co., Ltd.

Yuki Higashide

Syunji Yoshimi

Kenji Saito

Shingo Yanagihara

Isolators are disposed such that DC magnetic fields of permanent magnets intensity with each other, and thus, the input impedance of non-reciprocal circuitsand(regulating means) is reduced. Accordingly, the impedance conversion ratio between the output impedance of amplifying meansand the input impedance of the regulating meansis reduced to be relatively small. Thus, by simplifying the configuration of matching meansdisposed between the amplifying meansand the regulating means, the insertion loss of the matching meanscan be reduced, thereby enhancing the efficiency of a circuit module. Additionally, it is possible to dispose the non-reciprocal circuitsandclose to each other so that the DC magnetic fields of the permanent magnets can intensity with each other, thereby increasing the design flexibility of the circuit moduleand accordingly reducing the size of the circuit module

Circuit module

As a capacitor Cj is connected in parallel to a non-reciprocal circuit, in a predetermined frequency band in which a power amplifieris used, or in other words, in a predetermined frequency band used in communication, an input impedance of the non-reciprocal circuitis adjusted and the length of an impedance curve (reflection coefficient S) at an input terminal Pof the non-reciprocal circuitcan thus be reduced. In addition, an output impedance of the power amplifierand an input impedance of the non-reciprocal circuitcan be matched in a broad band through an interstage matching circuit(input matching circuit) provided between an output terminal Pof the power amplifierand the input terminal Pof the non-reciprocal circuit

Growing community of inventors

Kyoto, Japan

Yuki Higashide