Three terminal remotely controlled spdt antenna switch

Details Three terminal remotely controlled spdt antenna switch Three terminal remotely controlled spdt antenna switch

H - Electricity

03

H

351/58

H03H 11/36 (2006.01) H01Q 3/24 (2006.01) H01Q 21/00 (2006.01) H04B 1/18 (2006.01)

Patent

CA 1307045

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).

586137

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