Compact aviation vertically polarized log periodic antenna

Details Compact aviation vertically polarized log periodic antenna Compact aviation vertically polarized log periodic antenna

2007-04-27

2008-10-07

Owens, Douglas W. (Department: 2821)

Communications: radio wave antennas

Antennas

Logarithmically periodic

C343S705000, C343S728000, C343S786000, C343S795000, C343S805000, C343S867000, C343S891000

Reexamination Certificate

active

07432872

ABSTRACT:
A reduced height log periodic antenna that may safely be positioned under the rotating blades of a helicopter sitting on the ground and still resonate in the frequency range at which the antenna was originally designed to resonate. The antenna comprises a pair of antenna booms, a first plurality of vertical antenna radiating elements connected to the booms, and a second plurality of vertical antenna radiating elements connected to the booms. In addition, the antenna includes a plurality of tuned horizontal antenna radiating elements, each tuned horizontal radiating element being connected to the top of one of the second plurality of vertical antenna radiating elements, and a plurality of tuned upwardly bent horizontal antenna radiating elements, each tuned upwardly bent horizontal antenna radiating element being connected to the bottom of one of the second plurality of vertical antenna radiating elements. The antenna is characterized by the fact that the second plurality of antenna radiating elements have been shortened from their original design length to fit vertically under the rotating blades of a helicopter, and the tuned horizontal radiating elements have been added to the shortened radiating elements to bring the shortened radiating elements back to their desired frequency response.

REFERENCES:
patent: 3683390 (1972-08-01), Cory et al.
patent: 3732572 (1973-05-01), Kuo
patent: 4616233 (1986-10-01), Westerman
patent: 5966100 (1999-10-01), Podger
patent: 5995060 (1999-11-01), Podger
patent: 6020857 (2000-02-01), Podger
patent: 6057805 (2000-05-01), Harrington
patent: 6121937 (2000-09-01), Podger

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