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公开(公告)号:WO1995013668A1
公开(公告)日:1995-05-18
申请号:PCT/US1994010950
申请日:1994-09-29
Applicant: MOTOROLA INC.
Inventor: MOTOROLA INC. , PENNOCK, Mark , GOERGEN, Glenn, C. , ALBERT, Mike, M.
IPC: H04B07/00
CPC classification number: H04B1/3833 , H01Q3/24 , H04B1/3877 , H04B1/40
Abstract: An electronic antenna switching system switches between an internal and an external antenna (105, 107) on a portable radiotelephone (103). Here, the external antenna (107) contains a coil cord connector (111). In the coil cord connector (111) an electrical ground or a predetermined voltage is applied to a center conductor (205) of a coax cable (201). Internal to the radiotelephone (103), an antenna detector circuit (113) detects when the second antenna (107) is attached to the electronic antenna switching system and generates a control signal (119) in response thereto. A switch (115) switches the active transmission path between the internal and the external antenna's transmission path in response to the control signal (119).
Abstract translation: 电子天线切换系统在便携式无线电话机(103)上的内部和外部天线(105,107)之间切换。 这里,外部天线(107)包含线圈线连接器(111)。 在线圈线连接器(111)中,将电接地或预定电压施加到同轴电缆(201)的中心导体(205)。 在无线电话机(103)的内部,天线检测器电路(113)检测第二天线何时附接到电子天线切换系统,并响应于此产生控制信号(119)。 开关(115)响应于控制信号(119)切换内部和外部天线的传输路径之间的有效传输路径。