Communications: radio wave antennas – Antennas – Wave guide type
Patent
1990-02-05
1991-05-21
Wimer, Michael C.
Communications: radio wave antennas
Antennas
Wave guide type
343786, H01Q 1300
Patent
active
050179373
ABSTRACT:
A wideband hybrid horn antenna in which a circular section horn (1) is fed by a circular feed guide (3). A dielectric polyrod (7) is cantilever mounted in the throat end (4) of the horn (1) and is tapered to provide a match to the guide (3). Its forward section is tapered from the guide diameter down to about 2 mm just outside the mouth (11) of the horn (1). The various dimensions--horn diameter at throat and aperture, flare angle, polyrod diameter taper and extent--are all chosen to produce a balance of opposing effects on the beamwidth and thus provide a fixed beamwidth substantially independent of frequency over a wide band. A large bandwidth, from 8 to 16 GHz in the particular case, is thus obtained with a substantially constant beamwidth over the band.
REFERENCES:
patent: 2801413 (1957-07-01), Beck
patent: 3305870 (1967-02-01), Webb
patent: 4021814 (1977-05-01), Kerr et al.
patent: 4468672 (1984-08-01), Dragone
patent: 4673947 (1987-06-01), Newham et al.
Johnson et al, "Ridge Loaded Horns", Antenna Engineering Handbook, 1984, pp. 40-3-40-4.
Andrews Bernard J.
Newham Paul
Le Hoang-anh
The Marconi Company Limited
Wimer Michael C.
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