Antenna switching apparatus

Details Antenna switching apparatus Antenna switching apparatus

1994-12-20

1996-11-12

Pham, Chi H.

Telecommunications

Transmitter and receiver at same station

With transmitter-receiver switching or interaction prevention

455 89, 455129, 4552771, 455292, H04B 118

Patent

active

055749879

ABSTRACT:
The antenna switch of the present invention switches from a portable radio's internal antenna to an external, vehicle adapter antenna. The second antenna is part of the vehicle adapter that supplies DC power to the vehicle adapter. A 1/4-wavelength transformer couples the internal antenna to the portable radio's transceiver. Diodes couple transformer and antenna to ground. A 1/2-wavelength transformer couples the vehicle adapter to the transceiver. When the portable radio is connected to the vehicle adapter, DC power is supplied to the diodes causing them to appear as a short thus making the first transformer appear as an open circuit. This causes a signal from the transceiver to be conducted to the second antenna on the vehicle adapter.

REFERENCES:
patent: 4397041 (1983-08-01), Takeda et al.
patent: 4803447 (1989-02-01), Schultz et al.
patent: 5261121 (1993-11-01), Hashimoto

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