WIDEBAND AND MULTIBAND EXTERNAL ANTENNA FOR PORTABLE TRANSMITTERS
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United States of America Patent
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Issued Date -
Mar 29, 2012
app pub date -
Sep 27, 2010
filing date -
Sep 27, 2010
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
A communication device is presented that has a multiband antenna structure. A helical load extends from a monopole and reduces the resonance frequency of the monopole to the UHF band while leaving a GPS resonance of the monopole substantially unchanged. Helical proximate and distal portions are connected to the load such that the overall antenna structure has a VHF resonance. The helical portions have different characteristics and are configured to not substantially affect the UHF or GPS resonances. The helical portions have different pitch angles to permit minimization of the length of the combined helical portions while providing a desired operating VHF bandwidth.
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