Notched antenna structure with a stepped shaped element
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United States of America Patent
Stats
-
Aug 9, 2011
Grant Date -
Nov 26, 2009
app pub date -
May 21, 2008
filing date -
May 21, 2008
priority date (Note) -
In Force
status (Latency Note)
Importance
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 1/4 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.
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