Hitachi Metals, Ltd.

Hitachi, Ltd.

Hitachi Media Electronics Co., Ltd.

Toshiyuki Wada

Kenji Hayashi

Keisuke Fukamachi

Makoto Katagishi

Takashi Shiba

Hiroyuki Aoyama

Yasunori Takaki

Norio Hosaka

To realize an antenna device that can operate in wide bands (in a plurality of frequency bands) and can achieve an excellent antenna gain and maintain non-directivity of vertically polarized waves in each band in a space-saving manner, and also to provide a technique capable of maintaining mechanical reliability of the antenna device. An antenna device including; an approximately U-shaped conductor antenna, on one end side of which a power feeding portion is provided and on the other end side of which an end portion is provided as an open end terminal, and which has a folded-back portion; a base body made of an insulating material; a substrate on which said conductor antenna and said base body are mounted; conductor planes of said one end side and said the other end side of said conductor antenna constituted to be approximately perpendicular to each other; said base body being fixed on said substrate; at least said one end side of said conductor antenna being fixed on said base body; and said folded-back portion being fixed on said substrate.

Antenna device and wireless communication apparatus using the same

A multi-band transceiver has a function of sharing transmitted and received signals of multiple frequency bands by the same antenna. The multi-band transceiver mounts multiple filters that correspond to the multiple frequency bands and multiple amplifiers for amplifying the transmitted signals on the same substrate, and arranges the multiple filters in close vicinity to the amplifier in the order where the multiple filters are excellent in their temperature characteristic.

Multi-band transceiver and radio communication device using the transceiver

Growing community of inventors

Kumagaya, Japan

Toshiyuki Wada