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:
Jan. 18, 2011
Filed:
Jan. 23, 2007
Hok Huor Ou, Kanagawa, JP;
Seiji Nishi, Tokyo, JP;
Hiroyo Ogawa, Kanagawa, JP;
Kiyoshi Hamaguchi, Kanagawa, JP;
Yozo Shoji, Kanagawa, JP;
Hok Huor Ou, Kanagawa, JP;
Seiji Nishi, Tokyo, JP;
Hiroyo Ogawa, Kanagawa, JP;
Kiyoshi Hamaguchi, Kanagawa, JP;
Yozo Shoji, Kanagawa, JP;
Abstract
A low-cost, compact circular waveguide array antenna which improves an antenna reflection loss characteristic and enables an improvement in radiation characteristics, particularly radiation gain. The circular waveguide array antenna includes feeding portions which feed electromagnetic waves to one ends of circular waveguides and radiation apertures which radiate the electromagnetic waves at the opposite ends. Each circular waveguide includes a conical horn, with a diameter of a feeding side aperture at the feeding portion end being a, a diameter of the radiation aperture being d, which is larger than the diameter a of the feeding side aperture, and an opening angle being 2α. If a wavelength of a central frequency of an employed frequency band is λ, then a value of α, which is half of the opening angle, is set between 0.8×Arcsin(0.1349114/(d/λ)) and 1.2×Arcsin(0.1349114/(d/λ)).