Capacitive coupled extendable antenna

Details Capacitive coupled extendable antenna Capacitive coupled extendable antenna

1995-04-25

1997-08-26

Le, Hoanganh T.

Communications: radio wave antennas

Antennas

With radio cabinet

343895, 343901, H01Q 124

Patent

active

056614969

ABSTRACT:
An capacitive coupled extendable antenna for cordless telephones and for portable cellular telephones is disclosed. The antenna is operated, in its extended state, as the equivalent of a half-wave dipole antenna due to capacity capacitive coupling between the quarter-wave helical antenna element and the quarter-wave whip antenna element and compensates, in its retracted state, the deficient capacity component of the helical antenna element owing to capacity capacitive coupling between the metal sleeve and the helical antenna element. The antenna also improves the efficiency of the whip antenna element as well as the efficiency of the helical antenna element by coupling the metal sleeve to a tube under the condition that the whip antenna element is fully inserted into the tube.

REFERENCES:
patent: 4868576 (1989-09-01), Johnson, Jr.
patent: 5317325 (1994-05-01), Bottomley
patent: 5438339 (1995-08-01), Itoh et al.
patent: 5467096 (1995-11-01), Takamoro et al.

Affiliated with

Also associated with

Rating

Capacitive coupled extendable antenna does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Capacitive coupled extendable antenna, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Capacitive coupled extendable antenna will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1991293