Notched antenna structure with a stepped shaped element

Details Notched antenna structure with a stepped shaped element Notched antenna structure with a stepped shaped element

2011-08-09

2011-08-09

Owens, Douglas W (Department: 2821)

Communications: radio wave antennas

Antennas

With radio cabinet

C343S767000, C343S829000

Reexamination Certificate

active

07994987

ABSTRACT:
An antenna assembly (10) includes a ground plane formed on a chassis (12) of the radio and the functional knob forming an antenna element (11). The antenna assembly further includes a slot or notch element (14) in the ground plane substantially adjacent to the functional knob and having a length less than ¼ wavelength, and a coaxial cable (13) feeding the antenna element. A shield of the coaxial cable can be directly connected to the ground plane and a center conductor of the coaxial cable can be directly coupled to the functional knob to provide a galvanic connection for narrowband performance or the center conductor can be electromagnetically coupled to the functional knob for wideband performance or both. The antenna assembly can create a zero volume notch type ground excitation.

REFERENCES:
patent: 5276454 (1994-01-01), Gonzalez et al.
patent: 5572190 (1996-11-01), Ross et al.
patent: 7116937 (2006-10-01), Kinzler
patent: 2002/0021250 (2002-02-01), Asamo et al.
patent: 2007/0103367 (2007-05-01), Wang
International Application No. PCT/US2009/044782 with Search Report and Written Opinion, mailed May 21, 2009—11 pages.
International Preliminary Report on Patentability—PCT/US2009/044782, Issued Nov. 23, 2010—5 pages.

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