发明名称 |
AUTO-TUNED RFID READER ANTENNA |
摘要 |
A reader for an RFID system includes an antenna assembly, a signal driver and a controller. The antenna assembly has an antenna coupled to an antenna tuning circuit which includes a variable capacitance circuit. The signal driver is coupled to the antenna assembly to apply a drive signal to the antenna assembly. The controller is coupled to the antenna assembly to determine a difference between an antenna impedance and a signal driver impedance and to set the variable capacitance at a set capacitance value which reduces the impedance differenc e.
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申请公布号 |
CA2581553(A1) |
申请公布日期 |
2007.09.22 |
申请号 |
CA20072581553 |
申请日期 |
2007.03.14 |
申请人 |
ASSA ABLOY IDENTIFICATION TECHNOLOGY GROUP AB |
发明人 |
ANDRESKY, DAVID |
分类号 |
H01Q23/00;G01V3/12;G06K19/07;H02J17/00;H03J3/02 |
主分类号 |
H01Q23/00 |
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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