Mast mounted omnidirectional phase/phase direction-finding anten

Details Mast mounted omnidirectional phase/phase direction-finding anten Mast mounted omnidirectional phase/phase direction-finding anten

1995-08-16

1998-06-16

Le, Hoanganh T.

Communications: radio wave antennas

Antennas

Wave guide type

343893, 343853, 343844, H01Q 1300

Patent

active

057678146

ABSTRACT:
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.

REFERENCES:
patent: 3605099 (1971-09-01), Griffith
patent: 3803618 (1974-04-01), Coleman
patent: 4584582 (1986-04-01), Munger
patent: 4962383 (1990-10-01), Tresselt
patent: 5506592 (1996-04-01), MacDonald et al.

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