Three terminal remotely controlled SPDT antenna switch

Details Three terminal remotely controlled SPDT antenna switch Three terminal remotely controlled SPDT antenna switch

1988-02-29

1989-02-07

Laroche, Eugene R.

Wave transmission lines and networks

Plural channel systems

Having branched circuits

333262, 455 78, 455129, 455277, H03H 1136, H01P 115

Patent

active

048034479

ABSTRACT:
An antenna switch (302) includes a radio terminal (R) and first and second antenna terminals (A1 and A2). When the second antenna terminal (A2) is unterminated, the radio terminal (R) is coupled to the first antenna terminal (A1). When the second antenna terminal (A2) is connected to a remote antenna system (304), the switch automatically couples the radio terminal (R) to the second antenna terminal (A2). Thus, the switch does not require a separate control terminal (C) and control signal to switch between the first and second antenna terminals. Instead, the switch is controlled by the presence or absence of a DC current at the second antenna terminal (A2). The remote antenna system includes a remote antenna (308) and a low pass filter (310) coupled between the remote antenna and ground. An alternate embodiment is described which includes a DC amplifier (402).

REFERENCES:
patent: 3076155 (1963-01-01), Parker
patent: 4085366 (1978-04-01), Padgett
patent: 4525869 (1985-06-01), Hamada et al.
patent: 4584709 (1986-04-01), Kneisel et al.
patent: 4626806 (1986-12-01), Rosar et al.
patent: 4656364 (1987-04-01), Yokogawa et al.

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