小型アンテナ

Compact antenna

Abstract

(57)【要約】 【課題】 携帯型情報端末機器内の回路を有効に活用し てアンテナの小型化に伴う同調上の問題を解消し、ロッ ド型アンテナやイヤホン型アンテナにみられるような使 用場所の制約・事故の懸念・デザイン上の不都合さ・機 能上の無駄等のない携帯型情報端末機器をベースとし た、内蔵可能なFM文字多重放送受信機用小型アンテナ を提供する。 【解決手段】 固定と可動の2つの放射素子を2接点で 導通させループ状の放射素子を構成し、しかも可動部分 の放射素子を動かすことにより放射素子の長さが変化す るスライド方式の放射素子と可変容量ダイオード及び整 合回路によりスライド型ループアンテナを構成する。さ らに受信電圧検出回路と自動同調制御回路によりこの可 変容量ダイオードの印可電圧を調整して自動的に周波数 同調を行う。
PROBLEM TO BE SOLVED: To built a loop type radiation element into an equipment casing and to minimize reduction of the antenna gain by securing the electrical conduction between the divided radiation elements and varying the length of the loop type radiation element consisting of the divided radiation elements. SOLUTION: A loop type compact antenna consists of a radiation element, a varactor diode 34 and a matching circuit. The diode 34 varies its capacitance value according to the voltage applied from a terminal 37 and constructs a tuning circuit of a slide type loop antenna. Then the diode 34 is combined with a matching capacitor 35 which secures the matching with the receiving circuit part following a feeding point 36. Thus a matching circuit is obtained. Then the radiation element is divided into two parts as a fixed antenna element 31 and a mobile antenna element 32, and the electrical conduction is secured between both elements 31 and 32. Thus the length of a loop type radiation element consisting of the elements 31 and 32 is varied. COPYRIGHT: (C)1997,JPO

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    JP-2012173942-ASeptember 10, 2012Sony Corp, ソニー株式会社通信装置