Communications: radio wave antennas – Antennas – Plural separate diverse type
Patent
1983-06-13
1985-09-10
Lieberman, Eli
Communications: radio wave antennas
Antennas
Plural separate diverse type
343789, 343855, H01Q 324, H01Q 2100
Patent
active
045409889
ABSTRACT:
A broadband multi-element antenna is presented. The antenna comprises a monopole centrally disposed within a cavity of the body, and a plurality of antenna elements disposed at ninety degree increments about the periphery of the cavity. A plurality of isolation traps are connected between selected pairs of the antenna elements. The isolation traps are half-wavelength transmission lines which permit excitation of the respective plurality of elements by input signals which are of equal amplitude and 180.degree. out-of-phase but are short circuits between the respective pairs for in phase signals parasitically induced from the monopole. Additionally, switching traps are connected to respective ones of the antenna elements. The switching traps comprise quarter-wave transmission lines which are switchable to ground and selectively provide a short circuit of signals at the respective ones of the elements for changing the radiation pattern of the antenna.
REFERENCES:
patent: 1708944 (1929-03-01), Heising
patent: 2149333 (1939-03-01), Brown
patent: 2465381 (1945-03-01), Libby
patent: 2924823 (1955-10-01), Carter
patent: 3569971 (1971-03-01), Griffee
patent: 3713167 (1973-01-01), David
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patent: 4454514 (1984-06-01), Itoh et al.
Munk et al., "A Broadband Cavity Antenna with a Steerable Cardioid Pattern", 1980 Int'l Symposium Digest, IEEE Conference, Quebec, Can., Jun. 2-6, 1980, pp. 298-301.
Larson Clayton J.
Munk Benedikt A.
Beers Robert F.
Lieberman Eli
The United States of America as represented by the Secretary of
Wein Frederick A.
Wimer Michael C.
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