JPS5866722U - Impedance conversion circuit for FM antenna - Google Patents

Impedance conversion circuit for FM antenna

Info

Publication number
JPS5866722U
JPS5866722U JP16120981U JP16120981U JPS5866722U JP S5866722 U JPS5866722 U JP S5866722U JP 16120981 U JP16120981 U JP 16120981U JP 16120981 U JP16120981 U JP 16120981U JP S5866722 U JPS5866722 U JP S5866722U
Authority
JP
Japan
Prior art keywords
antenna
impedance conversion
conversion circuit
resonant circuit
inductance coil
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP16120981U
Other languages
Japanese (ja)
Inventor
重喜 武田
潤一 柴田
島方　正志
安弘 押目
Original Assignee
パイオニア株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by パイオニア株式会社 filed Critical パイオニア株式会社
Priority to JP16120981U priority Critical patent/JPS5866722U/en
Publication of JPS5866722U publication Critical patent/JPS5866722U/en
Pending legal-status Critical Current

Links

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は従来のインピーダンス変換回路例を示す回路図
、第２図は本考案によるインピーダンス変換回路の一実
施例を示す回路図、第３図ａ及びｂは本考案の回路の効
果を説明するための図、及び第４図は単同調と複同調の
特性を比較して示すグラフである。 １０．１０’・・・アンテナ素子片、１１．１１’。 １４、ｉ４’・・・可変容量ダイオード、１２．１２’
、１５．１５’・・・インダクタンスコイル。Fig. 1 is a circuit diagram showing an example of a conventional impedance conversion circuit, Fig. 2 is a circuit diagram showing an embodiment of an impedance conversion circuit according to the present invention, and Figs. 3 a and b explain the effects of the circuit according to the present invention. , and FIG. 4 are graphs comparing and showing the characteristics of single tuning and double tuning. 10.10'...Antenna element piece, 11.11'. 14, i4'...variable capacitance diode, 12.12'
, 15.15'...inductance coil.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] 容量性アンテナ素子及びインダクタンスコイルと共に共
振回路を構成する可変同調素子として可変容量ダイオー
ドを用いたＦＭアンテナ用インピーダンス変換回路にお
いて、前記可変容量ダイオードを前記共振回路の純並列
共振回路素子として用いると共に、前記インダクタンス
コイルの中点を接地したことを特徴とするＦＭアンテナ
用インピーダンス変換回路。In an impedance conversion circuit for an FM antenna using a variable capacitance diode as a variable tuning element constituting a resonant circuit together with a capacitive antenna element and an inductance coil, the variable capacitance diode is used as a pure parallel resonant circuit element of the resonant circuit, and the An impedance conversion circuit for an FM antenna, characterized in that the middle point of an inductance coil is grounded.
JP16120981U 1981-10-30 1981-10-30 Impedance conversion circuit for FM antenna Pending JPS5866722U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16120981U JPS5866722U (en) 1981-10-30 1981-10-30 Impedance conversion circuit for FM antenna

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16120981U JPS5866722U (en) 1981-10-30 1981-10-30 Impedance conversion circuit for FM antenna

Publications (1)

Publication Number Publication Date
JPS5866722U true JPS5866722U (en) 1983-05-06

Family

ID=29953586

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16120981U Pending JPS5866722U (en) 1981-10-30 1981-10-30 Impedance conversion circuit for FM antenna

Country Status (1)

Country Link
JP (1) JPS5866722U (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004093334A1 (en) * 2003-04-18 2004-10-28 Yokowo Co., Ltd. Variable tuning antenna and mobile wireless device using same

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004093334A1 (en) * 2003-04-18 2004-10-28 Yokowo Co., Ltd. Variable tuning antenna and mobile wireless device using same
US7557773B2 (en) 2003-04-18 2009-07-07 Yokowo Co., Ltd. Variable tuning antenna and mobile wireless device using same

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