UHF/VHF multifunction ocean antenna system

Details UHF/VHF multifunction ocean antenna system UHF/VHF multifunction ocean antenna system

1996-07-24

1998-06-09

Hajec, Donald T.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

343199, 343803, 343806, 343814, H01Q 2126

Patent

active

057641951

ABSTRACT:
A multifunction antenna system is selectively operative over the UHF and VHF frequency ranges using a novel arrangement of symmetrically disposed phased radiating elements that function as a dipole turnstile type array at UHF and as a monopole at VHF. At VHF the UHF radiating elements and feedlines are fed in parallel against ground to produce a pattern similar to that of a short vertical monopole. VHF and UHF coupling networks offer low VSWR and minimize circuit losses when utilized with a folded dipole array. The compact, lightweight structure is adaptable to oceanic communications by installing in a towed radome adapted for water flotation, and provides low angle hemispherical UHF radiation without pattern switching, with the water surface providing a reflective ground plane.

REFERENCES:
patent: 2581444 (1952-01-01), Richardson et al.
patent: 3312902 (1967-04-01), Dean et al.
patent: 3972046 (1976-07-01), Lombardi
patent: 4083051 (1978-04-01), Woodward
patent: 4180820 (1979-12-01), Johns
patent: 4434425 (1984-02-01), Barbano
patent: 5187488 (1993-02-01), Van Der Vis
patent: 5534882 (1996-07-01), Lopez

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