Combined transmit/receive single-post antenna for HF/VHF radar

Details Combined transmit/receive single-post antenna for HF/VHF radar Combined transmit/receive single-post antenna for HF/VHF radar

2009-07-17

2011-10-04

Gregory, Bernarr (Department: 3662)

Communications: directive radio wave systems and devices (e.g.,

With particular circuit

C342S082000, C342S089000, C343S725000, C343S728000, C343S741000, C343S866000, C343S867000, C343S874000

Reexamination Certificate

active

08031109

ABSTRACT:
An antenna configuration is described for high frequency (HF) or very high frequency (VHF) radars contained in a single vertical post. The radar may include a vertical dipole or monopole transmitting antenna collocated with a three-element receive antenna. The three antennas including two crossed loops and a vertical element are used in a direction-finding (DF) mode. Isolation between the three antennas produces high quality patterns useful for determining target bearings in DF mode. The single vertical post is sufficiently rigid mechanically that it may be installed along a coast without guy wires.

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