Mitsubishi Electric Corporation

Dai Ninomiya

Eigo Kuwata

Makoto Kimura

Kazuhiko Nakahara

Yoshitaka Kamo

Hiroyuki Nonomura

A MIM capacitor is included in any one or more of a first matching circuit and a second matching circuit. The mat capacitor performs impedance matching of a fundamental wave included in a high-frequency signal with a transmission line, and forms a short-circuit point for a harmonic included in the high-frequency signal at a connection point with the transmission line.

High-frequency amplifier

A control circuit () is configured to detect the impedance Pof a load () and control each of the reactance value Lof a first variable reactance element (), the reactance value Lof a second variable reactance element (), and the phase shift amount &#x3c6; of a phase shifter () on the basis of the detected impedance P. Consequently, impedance matching can be achieved even with the phase shifter () that performs discrete phase shift control.

Growing community of inventors

Tokyo, Japan

Dai Ninomiya