Portable radio apparatus having variable impedance matching circ

Details Portable radio apparatus having variable impedance matching circ Portable radio apparatus having variable impedance matching circ

1992-05-29

1994-08-02

Urban, Edward F.

Telecommunications

Transmitter and receiver at same station

Having particular housing or support of a transceiver

455289, 343702, 343861, H04B 138, H04B 118, H01Q 1240

Patent

active

053353684

ABSTRACT:
A portable radio apparatus having a casing thereof keeps a matching state of an antenna thereof in the call waiting state and in the operating state of the apparatus. The casing is foldable and expandable and accommodates therein a transmitting and receiving circuit connected via a variable matching circuit to the antenna. The matching circuit is connected to a sensor disposed in the casing for sensing a folded state thereof. Depending on a result of the sensing operation of the sensor, the matching circuit changes the matching state.

REFERENCES:
patent: 4018998 (1977-04-01), Wegner
patent: 4860024 (1989-08-01), Egashira
patent: 4992799 (1991-02-01), Garay
patent: 5014346 (1991-05-01), Phillips et al.
patent: 5170173 (1992-12-01), Krenz et al.

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