Antenna switching circuit for a diversity receiving system and b

Details Antenna switching circuit for a diversity receiving system and b Antenna switching circuit for a diversity receiving system and b

1985-07-10

1987-04-07

Shoop, Jr., William M.

Electrical transmission or interconnection systems

Switching systems

307146, 333103, H02J 1700

Patent

active

046563644

ABSTRACT:
An antenna switching circuit which selectively transmits, to a receiver, RF signals from a plurality of antennas including RF signals of different frequency bands such as the VHF band and the MF band using a single output terminal. To prevent a level drop of RF signals of one of the frequency bands due to a common use of the output terminal, a unidirectional switching element is added to a switching circuit network by which the selection of RF signals from the different antennas is performed.
A branching circuit for separating RF signals of different frequency bands is provided with an attenuation operation using a variable impedance characteristic of a semiconductor switching element which is basically on-off operated for the switching between the RF signals of the different frequency bands.

REFERENCES:
patent: 2904677 (1959-09-01), Heidester
patent: 3492501 (1970-01-01), Allen et al.
patent: 4492937 (1985-01-01), Theriault
patent: 4527136 (1985-07-01), Kamiya
patent: 4542300 (1985-09-01), Nagatomi

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