Antenna apparatus capable of directivity control

Details Antenna apparatus capable of directivity control Antenna apparatus capable of directivity control

2007-12-27

2010-10-05

Tarcza, Thomas H (Department: 3662)

Communications: directive radio wave systems and devices (e.g.,

Directive

Including a steerable array

C343S876000

Reexamination Certificate

active

07808431

ABSTRACT:
The antenna apparatus includes first to fourth antenna elements successively arranged at regular angular intervals around the central point on the same plane and respectively having first to fourth feed points, and a phase shifter delaying the phase of the received electric wave approximately by 90 degrees. The unidirectivity of the antenna apparatus is controlled in four directions of 0 degree, 90 degrees, 180 degrees and 270 degrees by selectively connecting the first to fourth feed points, the phase shifter and a television receiver. Therefore, multipath interference in these directions can be suppressed.

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patent: 7432857 (2008-10-01), Yamamoto et al.
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patent: 2002/0036586 (2002-03-01), Gothard et al.
patent: 2007/0063909 (2007-03-01), Fujita et al.
patent: 2152759 (1985-08-01), None
patent: 2006-157209 (2006-06-01), None

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