H - Electricity – 04 – B
Patent
H - Electricity
04
B
H04B 1/40 (2006.01) H04B 1/38 (2006.01) H04Q 7/32 (2006.01)
Patent
CA 2064129
A car telephone included in a car telephone system and selectively operable in a car-mounted mode or in a portable mode. A portable unit and a telephone antenna constitute a mobile car telephone set while a car antenna, a power amplifier unit, a curled cord, a connection unit constitute a car-mounted telephone together with the portable unit. The car telephone operates in a unique manner in a car-mounted mode. The power amplifier unit converts a received signal from a base station included in the system to an intermediate frequency (IF) signal by a receiving mixer and feeds the IF signal to the curled cord. The IF signal is transferred to a demodulator included in the portable unit over a coaxial cable incorporated in the curled cord and the connection unit. Therefore, the transmission loss of the signal to the portable unit particular to the coaxial cable is noticeably reduced, whereby the constants of the circuits included in the car telephone can be selected with unprecedented freedom.
Hirasawa Naoki
Kobayashi Shinichi
Corporation Nec
Smart & Biggar
LandOfFree
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