发明名称 |
THREE TERMINAL REMOTELY CONTROLLED SPDT ANTENNA SWITCH |
摘要 |
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). |
申请公布号 |
CA1307045(C) |
申请公布日期 |
1992.09.01 |
申请号 |
CA19880586137 |
申请日期 |
1988.12.16 |
申请人 |
MOTOROLA, INC. |
发明人 |
SCHULTZ, CHALRES A.;MARKO, PAUL D.;JARAMILLO, GIOVANNI |
分类号 |
H01Q21/00;H01P1/15;H01Q3/24;H04B1/18 |
主分类号 |
H01Q21/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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