Wireless communication systems and methods and transmitter units for use therein
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United States of America Patent
Stats
-
Nov 24, 2009
Grant Date -
Aug 7, 2008
app pub date -
Dec 26, 2007
filing date -
Feb 1, 2007
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A wireless communication system includes a portable, typically hand-held transmitter which includes RF absorbing material and/or one or more dissipative parasitic antennas for reducing RF fields in close proximity to the operator to such an extent as to substantially preempt the effect of the operator presence, specifically the operator's hand, in field operation. As a result, the RF absorbing material and/or one or more dissipative parasitic antennas reduces the proportionate effect upon the RF radiation level caused by the operator's hand or other body part. The RF absorbing material may comprise a layer of such material upon a surface of a ground plane within a housing of the transmitter, and/or on an interior surface of the housing, and/or on an exterior surface of the housing. The dissipative parasitic antenna may comprise a printed antenna and resistive load integrated on the transmitter's printed circuit board or elsewhere in or on the housing.
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