Title: Dual-frequency circularly polarized spiral antenna for satellite navigation

Abstract: This disclosure deals with a novel dual-frequency circularly polarized antenna that is particularly adapted for receiving satellite transmissions and/or for transmitting signals to satellites as for navigation purposes, the antenna being adapted through novel conductive preferably spiral-element configurations of different lengths, to produce substantially omnidirectional horizontal coverage and substantially hemispherical vertical coverage at two or more operating frequencies.

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Inventors: Smith, Valor Clark (LeMesa, CA, US)

Application Number: 628047
Filing Date: 1975-11-03
Publication_date: 1977-02-15
Assignee: CHU Associates, Inc. (Littleton, MA)
Primary Class(es): 343/895 343/873
Other Classes:
US Patent Ref:

3940772

Feb, 1976

Ben-Dou

343/895.

Other Refs:
Primary Examiner: Lieberman, Eli
Assistant Examiner:
Attorney: Rines and Rines