Portable radio communication device capable of transmitting the

Details Portable radio communication device capable of transmitting the Portable radio communication device capable of transmitting the

1994-02-15

1996-08-20

Eisenzopf, Reinhard J.

Telecommunications

Transmitter

With coupled antenna

455126, 455127, 343752, 343895, 343702, H04B 104

Patent

active

055488277

ABSTRACT:
A portable radio communication device has an antenna which can be extended for use and retracted for storage, and can transmit a signal at the same level of electric energy when the antenna is stored as when the antenna is extended. When the antenna is retracted and stored, the stored condition is detected by a detecting switch. In response to a detected signal from the detecting switch, a transmission output controller produces an increased transmission output control signal to increase the level of electric energy of the signal to be transmitted which is higher than a normal level of electric energy of signals transmitted from the antenna. When the increased transmission output control signal is generated, a power amplifier amplifies a signal to be transmitted which is supplied from a transmission signal generator, and supplies the amplified signal to the antenna. Therefore, even when the antenna is stored, it can radiate the signal at the same level of electric energy as when the antenna is extended. The antenna comprises an antenna which operates as a loaded antenna when it is extended and as a helical antenna when it is stored.

REFERENCES:
patent: 4335469 (1982-01-01), Tharp et al.
patent: 4868576 (1989-09-01), Johnson, Jr.
patent: 4882591 (1989-11-01), Galvin et al.
patent: 5144324 (1992-09-01), Chin et al.
patent: 5353036 (1994-10-01), Baldry
patent: 5374937 (1994-12-01), Tsunekawa et al.
Motorola Technical Developments, vol. 19, Jun. 1993, US Wiggenhorn, "Hel/Tel Antenna".

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