JPS56713A - Antenna unit - Google Patents
Antenna unitInfo
- Publication number
- JPS56713A JPS56713A JP7624779A JP7624779A JPS56713A JP S56713 A JPS56713 A JP S56713A JP 7624779 A JP7624779 A JP 7624779A JP 7624779 A JP7624779 A JP 7624779A JP S56713 A JPS56713 A JP S56713A
- Authority
- JP
- Japan
- Prior art keywords
- antenna element
- frequencies
- unit
- impedance
- reactance
- 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
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
- Details Of Aerials (AREA)
- Variable-Direction Aerials And Aerial Arrays (AREA)
Abstract
PURPOSE:To make short the length of antenna element and to make small the size of unit, by variably controlling the reactance of the two terminal reactance circuit connected to a suitable part of the antenna element having a distributed inductance. CONSTITUTION:Since the antenna element 8 has a distributed inductance, it is equivalent to the coil the cancel the reactance added to the element, allowing to make short the antenna element length. Further, the pattern is designed to obtain the impedance at frequencies f1-f2-f3 of the unit of the element 8 as the curve A, it is connected with the parallel resonance circuit consisting of the coil 11 and variable capacitor 12, the resonant frequency is set to required value to obtain positive impedance at frequencies f1-f2-f3, then the impedance is turned out to be the curve B. Accordingly, the capacitor 12 changes the resonant frequency and the reactive component added to the shorted element 8, then tuning can be made at frequencies f1-f2-f3, allowing to make small the unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7624779A JPS56713A (en) | 1979-06-14 | 1979-06-14 | Antenna unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7624779A JPS56713A (en) | 1979-06-14 | 1979-06-14 | Antenna unit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS56713A true JPS56713A (en) | 1981-01-07 |
Family
ID=13599848
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7624779A Pending JPS56713A (en) | 1979-06-14 | 1979-06-14 | Antenna unit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS56713A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61175778U (en) * | 1985-04-22 | 1986-11-01 | ||
| WO2000002287A1 (en) * | 1998-07-02 | 2000-01-13 | Matsushita Electric Industrial Co., Ltd. | Antenna unit, communication system and digital television receiver |
| US6608594B1 (en) | 1999-10-08 | 2003-08-19 | Matsushita Electric Industrial Co., Ltd. | Antenna apparatus and communication system |
| EP1617564A1 (en) * | 2003-04-18 | 2006-01-18 | Yokowo Co., Ltd | Variable tuning antenna and mobile wireless device using same |
-
1979
- 1979-06-14 JP JP7624779A patent/JPS56713A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61175778U (en) * | 1985-04-22 | 1986-11-01 | ||
| WO2000002287A1 (en) * | 1998-07-02 | 2000-01-13 | Matsushita Electric Industrial Co., Ltd. | Antenna unit, communication system and digital television receiver |
| US6639555B1 (en) | 1998-07-02 | 2003-10-28 | Matsushita Electric Industrial Co., Ltd. | Antenna unit, communication system and digital television receiver |
| US6608594B1 (en) | 1999-10-08 | 2003-08-19 | Matsushita Electric Industrial Co., Ltd. | Antenna apparatus and communication system |
| EP1617564A1 (en) * | 2003-04-18 | 2006-01-18 | Yokowo Co., Ltd | Variable tuning antenna and mobile wireless device using same |
| EP1617564A4 (en) * | 2003-04-18 | 2007-01-17 | Yokowo Seisakusho Kk | Variable tuning antenna and mobile wireless device using same |
| CN100438356C (en) * | 2003-04-18 | 2008-11-26 | 株式会社友华 | 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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