Antenna for a portable radio telephone

Details Antenna for a portable radio telephone Antenna for a portable radio telephone

1995-04-12

1998-06-30

Vo, Nguyen

Telecommunications

Transmitter

Mobile or portable

455550, 343702, H04B 1034

Patent

active

057747946

ABSTRACT:
An antenna for radio communications such as portable telephone systems including a rod-form antenna element installed in the case of a radio communication set so that the antenna element can be retracted and pulled out with one portion of the antenna element remains outside of the case when the antenna element is accommodated inside the case; an impedance matching device connected to the feeding point of the antenna element and to the radio communication set; a stub which is a grounded conductive member and is installed so as to surround the outer circumference of the antenna element without touching the antenna element when the antenna element is accommodated inside the case. The base end of the antenna element and the base end of the stub are electrically coupled when the antenna element is completely accommodated inside the case so that good impedance matching can be obtained even when the antenna element is accommodated inside the case and that incoming calls are received without any failure.

REFERENCES:
patent: 4860024 (1989-08-01), Egashira
patent: 5434582 (1995-07-01), Koike et al.
patent: 5551069 (1996-08-01), Harrison et al.

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