Wireless communication systems and methods and transmitter...

Details Wireless communication systems and methods and transmitter... Wireless communication systems and methods and transmitter...

2007-12-26

2009-11-24

Chang, Daniel D (Department: 2819)

Communications: radio wave antennas

Antennas

With electrical shield

C455S106000

Reexamination Certificate

active

07623086

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.

REFERENCES:
patent: 7099631 (2006-08-01), Lee et al.
patent: 2006/0132360 (2006-06-01), Caimi et al.

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