发明名称 |
Antenna for reader/writer |
摘要 |
In an antenna 1a for reader/writer of an interrogator in a non-contact data carrier system comprising the interrogator and a transponder, the antenna for reader/writer of the interrogator comprises a transmitting antenna 2 for transmitting a signal to the transponder and a receiving antenna 3 for receiving a signal from the transponder, and the receiving antenna 3 is a loop coil located at a position where magnetic fields of opposite polarities are induced in the receiving antenna 3 by magnetic coupling between the receiving antenna 3 and the transmitting antenna 2 and where the magnetic fields of opposite polarities cancel out each other. Preferably, the transmitting antenna 2 is comprised of at least two loop coils 2a, 2b for generating magnetic fields of opposite polarities to each other. |
申请公布号 |
US6137447(A) |
申请公布日期 |
2000.10.24 |
申请号 |
US19960721949 |
申请日期 |
1996.09.27 |
申请人 |
SONY CHEMICALS CORPORATION |
发明人 |
SAITOH, SHOSHICHI;FUJIMOTO, MASAHIRO;ORIHARA, KATSUHISA;YANAGIBORI, SUSUMU |
分类号 |
H01Q7/00;G06K7/08;H01Q7/04;H04B5/00;(IPC1-7):H01Q21/28 |
主分类号 |
H01Q7/00 |
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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