Null-fill antenna, omni antenna, and radio communication...

Details Null-fill antenna, omni antenna, and radio communication... Null-fill antenna, omni antenna, and radio communication...

2008-12-02

2009-10-20

Tarcza, Thomas H (Department: 3662)

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

Directive

Including a steerable array

C343S771000

Reexamination Certificate

active

07605754

ABSTRACT:
A wide-angle null-fill antenna with no null in the depression angle range, an omni antenna using the same, and radio communication equipment. A null-fill antenna comprises a first antenna array including antenna elements arranged with a prescribed point as the center, and a second antenna array having amplitude characteristics substantially equal to those of the antenna elements forming the first antenna array. The first antenna array is excited so that the excitation amplitude distribution is to have symmetry with respect to the prescribed point, while the excitation phase distribution is to have point symmetry with respect to the prescribed point. The phase center of the first antenna array is substantially coincident with that of the second antenna array.

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European Search Report issued Oct. 19, 2005.

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