Folded tapered coaxial cavity-backed annular slot antenna

Details Folded tapered coaxial cavity-backed annular slot antenna Folded tapered coaxial cavity-backed annular slot antenna

1978-09-05

1980-04-29

Lieberman, Eli

Communications: radio wave antennas

Antennas

Waterborne

343769, H01Q 134, H01Q 1318

Patent

active

042008735

ABSTRACT:
A low profile transmitting antenna consisting of a circular slot in a coal cavity that is folded several times. The last inner fold of the coaxial cavity is loaded with the tuning coil. The tuning coil can in the alternative be connected in series with the transmitter leeds connected to the radiating slot. Concentric cylinders alternately attached to the top and bottom of the cavity are used to form the folded coaxial cavity that provides the equivalent of a tapered transmission line. Energy to be transmitted is fed across the circular slot of the antenna or in the alternative may be fed into the last inner fold in the center of the cavity. The antenna radiates energy out with the same radiation pattern as a vertical monopole antenna.

REFERENCES:
patent: 2644090 (1953-06-01), Dorne
patent: 2791769 (1957-05-01), Lindenblad
patent: 2867803 (1959-01-01), Kerley

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