Matsushita Electric Industrial Co., Ltd.

Hiroyuki Itokawa

Hisashi Adachi

Hiroaki Kosugi

Hiroyuki Nakamura

Toshio Ishizaki

Toshifumi Nakatani

Shunsuke Hirano

Makoto Sakakura

Toshiaki Nakamura

Youichi Morinaga

An antenna duplexer has an antenna terminal;

Antenna duplexer and mobile communication device using the same

When the radio circuit apparatus is transmitting, the output signal of the first local oscillator,is inputted to the transmitted frequency converter,as well as to the frequency divider,, and then the output signal of the frequency divider,is inputted to the modulator,. The modulator,modulates the output signal of the frequency divider,with a base band signal. The output signal of the modulator,is inputted to the transmitted frequency converter,to be converted to the frequency of a transmitted signal by the output signal of the first local oscillator,When the radio circuit apparatus is receiving, the output signal of the low noise amplifier,is inputted to the first frequency converter,to be converted to the first intermediate frequency by the output signal of the first local oscillator,The output signal of the filter,is inputted to the second frequency converter circuit,to be converted to the second intermediate frequency by the output signal of the second local oscillator,Thereby, unnecessary components for transmission can be easily lowered to make it possible to miniaturize the radio circuit apparatus.

Radio circuit apparatus and radio communication equipment

Growing community of inventors

Yokohama, Japan

Hiroyuki Itokawa