Uniden Corporation

Toshiaki Yuasa

Masato Suzuki

Jun Yoshida

Hideo Hikuma

Yoshihiko Baba

Mikio Iwakuni

Hitoshi Hachiga

Masaru Akiyama

Shuji Konishi

Isao Ohki

Tadashi Kogure

Teruhide Kunimitsu

Katsuhiro Miyamoto

Katsuya Kaneda

Toshihiro Takahashi

Kenji Sekine

Norio Abe

Hideyuki Ogawa

The object of the present invention is to provide a cellular phone to be used for emergency reports that performs GPS positioning by means of remote control from an emergency report center, and transmits positional information to the emergency report center. The emergency report cellular phone according to the present invention is constituted such that when an emergency report switch thereof is depressed, a call request is made to the emergency report center. The emergency report center transmits a response signal with the result that a call link is formed between the emergency report cellular phone and the emergency report center. Following completion of the telephone call, the emergency report center transmits a position recalculation command message, by means of a DTMF signal. The emergency report cellular phone, which has received this command message, performs GPS positioning and then converts latitudinal and longitudinal information to a DTMF signal before transmitting same to the emergency report center. As a result, even in a case where, in a time of emergency, a reporting party is unable to perform GPS positioning manually as a result of a poor physical condition, for example, since GPS positioning is possible by means of remote control, it is possible to rescue the reporting party in a rapid and reliable manner.

Emergency report cellular phone, cellular connection switching method and GPS positioning method

The diversity antenna circuit comprises a first antenna for receiving a vertical plane of polarization of an electric wave, a second antenna for receiving a horizontal plane of polarization thereof, a receiving means for detecting the electric field strength of a received signal, a first matching means for matching the first antenna to the receiving means, a second matching means for matching the second antenna to the receiving means, a first transfer means, a second transfer means, a first switching means, a second switching means, and a switching control means for connecting one of the first and second antennas to the receiving means and separating another one from the receiving means according to ON/OFF control of the first and second switching means based on received electric field strength.

Diversity antenna circuit

Antenna for radio communication equipment having improved impedance

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Chiba-ken, Japan

Toshiaki Yuasa