发明名称 |
Shielded, closely spaced transmit-receiver antennas for electronic article surveillance system |
摘要 |
A shielded, closely spaced transmit-receiver system for use in an electronic article surveillance system is disclosed wherein at least one of the antennas is provided with at least two twisted loops lying in a common plane each loop being twisted 180 DEG to be in phase opposition with the adjacent loop and wherein both antennas are substantially enclosed by a conductive shield having a discontinuity in an outer portion enclosing each of the twisted loops.
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申请公布号 |
US4509039(A) |
申请公布日期 |
1985.04.02 |
申请号 |
US19830510780 |
申请日期 |
1983.07.05 |
申请人 |
MINNESOTA MINING AND MANUFACTURING COMPANY |
发明人 |
DOWDLE, DEAN M. |
分类号 |
H01Q21/00;G08B13/24;(IPC1-7):G08B13/24;H01Q7/04 |
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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