The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 20, 1988
Filed:
Jul. 28, 1987
Takashi Ebisui, Kanagawa, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
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