Omni-directional antenna

Details Omni-directional antenna Omni-directional antenna

2007-05-30

2008-10-28

Phan, Tho G (Department: 2821)

Communications: radio wave antennas

Antennas

Microstrip

C343S702000, C343S846000

Reexamination Certificate

active

07443348

ABSTRACT:
An omni-directional antenna includes an electrically conductive ground plane, an electrically conductive parasitic disc spaced upwardly apart from the ground plane and parallel thereto, and an electrically conductive vertical antenna element extending up through the center of the ground plane and parasitic disc, The vertical element terminates in a tip defining a length above the parasitic disc that is matched to a frequency of interest. The parasitic disc and ground plane are preferably both circular. To prevent electrical connection, the vertical element preferably extends through separate insulators in the parasitic disc and ground plane. The length of the vertical element is matched to a microwave frequency; in particular, the length of the vertical element is proportioned to one-quarter wavelength of the frequency of interest. The invention is particularly suited to microwave frequencies.

REFERENCES:
patent: 3144646 (1964-08-01), Breithaupt
patent: 3605104 (1971-09-01), Weston et al.
patent: 4700197 (1987-10-01), Milne
patent: 5745079 (1998-04-01), Wang et al.
patent: 6765536 (2004-07-01), Phillips et al.
patent: 7002521 (2006-02-01), Egawa et al.

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