发明名称 |
Distinguishing between indoor and outdoor situation of transponder, employs two-frequency communication and wall with selective frequency opacity |
摘要 |
Two frequency bands are used for communication between base station (8) and transponder (20). The wall (4) of the indoor region (2) is transparent to a first frequency but opaque to a second. An independent claim is included for the corresponding communication system.
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申请公布号 |
DE10024852(C1) |
申请公布日期 |
2001.11.15 |
申请号 |
DE2000124852 |
申请日期 |
2000.05.19 |
申请人 |
SIEMENS AG |
发明人 |
BRAND, CHRISTIAN;HOFBECK, KLAUS |
分类号 |
B60R25/00;B60R25/24;G07C9/00;G08B25/10;H01Q15/00;H01Q17/00;H04Q7/38;(IPC1-7):E05B49/00;H04B1/59;G08C17/02 |
主分类号 |
B60R25/00 |
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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