Device for controlling extension and retraction of an antenna

Details Device for controlling extension and retraction of an antenna Device for controlling extension and retraction of an antenna

1994-12-28

1997-11-18

Eisenzopf, Reinhard J.

Telecommunications

Transmitter and receiver at same station

With a common signal processing stage

455 90, 343702, 343703, 36470505, H04B 138, H01Q 124

Patent

active

056898215

ABSTRACT:
In an IC memory card radio modem including an antenna, intensity of electric field received by the antenna is measured by an electric field intensity detector. An antenna driver is controlled such that, when the electric field intensity exceeds a predetermined value, the antenna is retracted or is not risen. The antenna is extended when the electric field intensity is equal to or lower than the predetermined value.

REFERENCES:
patent: 4803493 (1989-02-01), Jamison
patent: 4903333 (1990-02-01), Aizawa
patent: 4954828 (1990-09-01), Orr
patent: 5043721 (1991-08-01), May
patent: 5212725 (1993-05-01), Yamamoto et al.
patent: 5361061 (1994-11-01), Mays et al.

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