Antenna apparatus utilizing aperture of transmission line

Communications: radio wave antennas – Antennas – Balanced doublet - centerfed

Reexamination Certificate

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Details

C343S772000

Reexamination Certificate

active

07872612

ABSTRACT:
An antenna apparatus utilizing an aperture of transmission line, which is connected to a first transmission line having a predetermined characteristic impedance, includes a tapered line portion, and an aperture portion. The tapered line portion is connected to one end of the transmission line, and the tapered line portion includes a second transmission line including a pair of line conductors. The tapered line portion keeps a predetermined characteristic impedance constant and expands at least one of a width of the transmission line and an interval in a tapered shape at a predetermined taper angle. The aperture portion has a radiation aperture connected to one end of the tapered line portion. A size of one side of the aperture end plane of the aperture portion is set to be equal to or higher than a quarter wavelength of the minimum operating frequency of the antenna apparatus.

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Japanese Office Action issued in Japanese Patent Application No. JP 2007-143565 dated Sep. 7, 2010.

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