Communications: radio wave antennas – Antennas – Wave guide type
Reexamination Certificate
2011-01-18
2011-01-18
Nguyen, Hoang V (Department: 2821)
Communications: radio wave antennas
Antennas
Wave guide type
C343S772000, C343S786000
Reexamination Certificate
active
07872609
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 angle2α, is set between 0.8×Arcsin(0.1349114/(d/λ)) and 1.2×Arcsin(0.1349114/(d/λ)).
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Hamaguchi Kiyoshi
Nishi Seiji
Ogawa Hiroyo
Ou Hok Huor
Shoji Yozo
National Institute of Information and Communications Technology
Nguyen Hoang V
OKI Electric Industry Co., Ltd.
Rabin & Berdo PC
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