发明名称 |
Mast mounted omnidirectional phase/phase direction-finding antenna system |
摘要 |
A direction finding antenna system includes a plurality of monopole elements disposed symmetrically around a center of a circular ground plane at the same radial distance from the center and a multimode combiner connected to the monopole elements to provide one or more mode outputs. A phase difference detector determines phase differences between selected ones of the mode outputs to provide azimuth bearing of a detected object. Typically, four or eight monopole elements are used. Placement of the inherently narrowband monopole elements in a bicone structure having a polarizer grid extends the useful bandwidth. Multiband coverage is achieved with a plurality of such antennas connected by a feed cable positioned on the polarizer grid to avoid interference.
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申请公布号 |
US5767814(A) |
申请公布日期 |
1998.06.16 |
申请号 |
US19950515899 |
申请日期 |
1995.08.16 |
申请人 |
LITTON SYSTEMS INC. |
发明人 |
CONROY, PETER J.;CURRY, NATHAN D.;WARNER, DEREK R. |
分类号 |
H01Q3/40;H01Q13/04;H01Q21/20;H01Q25/02;(IPC1-7):H01Q13/00 |
主分类号 |
H01Q3/40 |
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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