Cellular telephone antenna
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United States of America Patent
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-
Aug 20, 1991
Grant Date -
N/A
app pub date -
Mar 6, 1990
filing date -
Mar 6, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An planar antenna for use with a cellular telephone has a dielectric substrate with conductive coatings on its two major surfaces. A coaxial cable extends through a central aperture in the substrate with a shield of the cable connected to coating on one surface and a center conductor of the cable connected to coating on the other substrate surface. A number of shunts extend through the substrate electrically connecting the coatings on the two surfaces at points along a line that runs through the central aperture. Another shunt extends through the substrate electrically connecting the coatings on the two surfaces at a point which is not along the line of the other shunts. The position of the last shunt is non-uniformly spaced with respect to the other shunts and is selected to alter an electrical characteristic of the antenna to a desired value.
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