JPS56707A - Tuning type antenna unit - Google Patents

Tuning type antenna unit

Info

Publication number
JPS56707A
JPS56707A JP7625579A JP7625579A JPS56707A JP S56707 A JPS56707 A JP S56707A JP 7625579 A JP7625579 A JP 7625579A JP 7625579 A JP7625579 A JP 7625579A JP S56707 A JPS56707 A JP S56707A
Authority
JP
Japan
Prior art keywords
reactance
impedance
workability
terminal
components
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
JP7625579A
Other languages
Japanese (ja)
Inventor
Joji Kane
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP7625579A priority Critical patent/JPS56707A/en
Publication of JPS56707A publication Critical patent/JPS56707A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04—Resonant antennas
    • H01Q9/16—Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole

Landscapes

  • Variable-Direction Aerials And Aerial Arrays (AREA)

Abstract

PURPOSE:To reduce the number of components and to increase the workability, by taking one of the secondary terminals of the semifixed coil transformer in the two terminal variable reactance circuit connected to the power supply terminal of antenna element as ground and another as power feeding. CONSTITUTION:The antenna elements 1, 1' have distributed constant and the dipole length is shorther than lambda/2 of used frequency signal to cause the element impedance into sufficiently small capacitive component. The reactance characteristics of the parallel resonance reactance circuit consisting of the variable capacitance element 2 and the inductance element 3 shows positive at the lower side of the resonant frequency and negative at the upper side, then the required value of positive reactance is added to the elements 1, 1' showing capacitive impedance characteristics and the winding ratio of the coils 3', 4' is set so that the impedance viewed from the power feeding terminal 5 is a pure resistance value in required frequencies, allowing tuning. Thus, the number of components is reduced and the workability is increased.
JP7625579A 1979-06-14 1979-06-14 Tuning type antenna unit Pending JPS56707A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7625579A JPS56707A (en) 1979-06-14 1979-06-14 Tuning type antenna unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7625579A JPS56707A (en) 1979-06-14 1979-06-14 Tuning type antenna unit

Publications (1)

Publication Number Publication Date
JPS56707A true JPS56707A (en) 1981-01-07

Family

ID=13600083

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7625579A Pending JPS56707A (en) 1979-06-14 1979-06-14 Tuning type antenna unit

Country Status (1)

Country Link
JP (1) JPS56707A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2508713A1 (en) * 1981-06-25 1982-12-31 Tdk Electronics Co Ltd INTERNAL ANTENNA FOR RECEIVING VERY HIGH FREQUENCY AND HYPERFREQUENCY BANDS

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2508713A1 (en) * 1981-06-25 1982-12-31 Tdk Electronics Co Ltd INTERNAL ANTENNA FOR RECEIVING VERY HIGH FREQUENCY AND HYPERFREQUENCY BANDS

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