Antenna for cordless telephone system

Details Antenna for cordless telephone system Antenna for cordless telephone system

1988-09-08

1989-10-24

Lev, Robert

Telephonic communications

Audio message storage, retrieval, or synthesis

455 89, H04R 138

Patent

active

048767093

ABSTRACT:
An antenna internally contained within a housing of a cordless telephone is configured generally as a plate disposed opposite the earphone transducer, and away from the user's face in position for normal use. The antenna is disposed to lie generally vertically, and is counterpoised against a generally vertically disposed circuit board. Configuring the antenna generally as a plate and placing it outboard away from the user's face minimizes detuning effects during normal handling in use. Optional side extensions to the plate increase the antenna capacitance. An optional counterpoising shield may be interposed between the receiver-transducer and the antenna plate to further minimize detuning effects. Mode switches are disposed in a position on the handset remote from the antenna to further minimize detuning effects during switching operations. A similar antenna may be disposed within the cordless telephone base unit with the antenna disposed remote from the surface on which the base unit is mounted, and further having its associated mode switch disposed at a location remote from the antenna so as to minimize detuning effects from proximity to metallic surfaces and mode switching.

REFERENCES:
patent: 3824465 (1984-07-01), Blough
patent: 4471493 (1984-09-01), Schober
patent: 4672685 (1987-06-01), Phillips et al.
patent: 4677657 (1987-06-01), Nagata et al.
patent: 4723305 (1988-02-01), Phillips et al.
patent: 4790794 (1988-04-01), Phillips et al.
"Small Antennas", by K. Fugimoto et al., published by John Wiley & Sons, Inc., Jan. 20, 1987, (p. 15).

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