Communications: radio wave antennas – Antennas – Wave guide type
Patent
1987-07-28
1988-12-20
Sikes, William L.
Communications: radio wave antennas
Antennas
Wave guide type
343772, 343783, H01Q 1300
Patent
active
047928140
ABSTRACT:
A conical horn antenna applicable to plural modes of electromagnetic waves is substantially composed of a feed waveguide positioned on the base end side and feeding a dominant mode of an electromagnetic wave, a conical horn positioned on the fore end side and radiating electromagnetic waves of plural modes including dominant and higher modes, and a desired mode of electromagnetic wave generating portion provided between the feed waveguide and the conical horn and generating an electromagnetic wave of a desired higher mode. The electromagnetic wave generating portion is composed of straight cylindrical waveguides having the same or different inside diameters and having a predetermined relation to the wavelength of maximum frequency and that of minimum frequency in a certain frequency band, and tapered waveguides which connect stages of said straight cylindrical waveguides, a feed waveguide and a conical horn, respectively, through truncated cone-like inner peripheral surfaces thereof and which expand forwardly from the base end side. The tapered waveguide adjacent to the feed waveguide may be constructed of two tapered portions having a gentle expansion angle on the base end side and a sharp expansion angle on the fore end side. n
REFERENCES:
patent: 3662393 (1972-05-01), Cohn
patent: 4295142 (1981-10-01), Thiere et al.
patent: 4349827 (1982-09-01), Bixler et al.
P. D. Potter, "A New Horn Antenna with Suppressed Sidelobes and Equal Beamwidths", Jun. 1963, pp. 1-8, Microwave Journal.
Seymour B. Cohn, "Flare-Angle Changes in a Horn as a Means of Pattern Control", Oct. 1970, pp. 41-46, Microwave Journal.
IEEE Transactions on Microwave Theory and Techniques, "Conversion of TE.sub.11 .degree. Mode by a Large Diameter Conical Junction", May 1969, pp. 277-279.
Le Hoang-anh
Mitsubishi Denki & Kabushiki Kaisha
Sikes William L.
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