Communications: radio wave antennas – Antennas – Microstrip
Patent
1976-08-09
1978-02-14
Lieberman, Eli
Communications: radio wave antennas
Antennas
Microstrip
343853, 343885, H01Q 138
Patent
active
040742709
ABSTRACT:
A very thin antenna assembly consisting of three electric microstrip ante systems arrayed on a single dielectric substrate over a ground plane and tuned to three different frequency bands. The low physical profile of the antennas and the assembly hollow conformal arraying capability about an aircraft body without disrupting the aerodynamics of the vehicle. A phase difference of 90.degree. between two elements of the UHF antenna system is used to obtain a wider bandwidth with good matching and also improves the radiation patterns of the array. Button type tuning capacitors in each of the elements of the UHF array permits compensation for variations in the center frequency of the UHF antenna system that are caused by the variation in the substrate dielectric constant, fabrication processes, etc. Also, close spacing of three antennas systems with minimum coupling is possible since most of the reactive energy from each antenna element is contained substantially within the volume bounded by the element and the portion of the ground plane beneath the element.
REFERENCES:
patent: 3541559 (1970-11-01), Evans
patent: 3680136 (1972-07-01), Collings
patent: 3811128 (1974-05-01), Munson
patent: 3971032 (1976-07-01), Munson et al.
Lieberman Eli
Sciascia Richard S.
St.Amand Joseph M.
The United States of America as represented by the Secretary of
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