Extendable multi-stage antenna using capacitive coupling technology

摘要

1. The technical field to which the invention described in the claims belongs;Extendable multi-stage antenna using capacitive coupling technology;2. Technical points to be solved by the invention;The antenna of the present invention is a novel antenna having an insulating means between a feed point and a helical portion and applying the principle of capacitive coupling. The antenna has better electrical characteristics and mechanical reliability than the prior art, The present invention provides an extendible multi-stage antenna using a capacitive coupling technique that has the effect of shortening the overall length of an antenna housed in a terminal.;3. The point of the solution of the invention;The present invention relates to a fixing means which can be mounted on a portable mobile communication terminal such as a cordless telephone, a cellular phone or a PCS phone; A whip formed in a straight line through the fixing means; A latching jaw for constituting a multi-stage structure; A leaf spring connected to the whip in the engaging jaw so as to be elastically stretchable in the longitudinal direction; A helical for performing an antenna function in a reception standby state at the time of insertion; A telescopic multi-stage antenna for a radiotelephone having a sleeve capacitively coupled to the helical is provided.;4. Important Uses of the Invention;The sleeve and the metal plate are capacitively coupled to each other with an insulator between the sleeve and the metal plate. The sleeve and the whip are coupled to each other. The whip moves in the vertical direction inside the leaf spring, The present invention is intended not only to have better electrical characteristics and mechanical reliability but also to have an effect of shortening the overall length of the antenna housed in the terminal since the antenna expansion and contraction function is configured in multiple stages.