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Cobra antenna

A cobra and antenna technology, applied in antennas, resonant antennas, antenna components, etc., can solve the problems of antenna impedance increase and impedance reduction, and achieve the effect of reducing restrictions

Inactive Publication Date: 2012-11-28
SONY CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, it has been reported that when the number of windings is one, the impedance of the antenna tends to increase even if the frequency exceeds 100 MHz; however, when the number of windings is three times, the impedance decreases sharply

Method used

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  • Cobra antenna
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Examples

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Embodiment Construction

[0026] The following will be based on Figure 1 to Figure 4 Exemplary embodiments of the present invention will be described, and will be described in the following order.

[0027] 1. Description of the basic structure and basic principles of the Cobra antenna

[0028] 2. Structure and characteristics of the cobra antenna according to the exemplary embodiment of the present invention

[0029] 3. Field Tests Performed Using Cobra Antennas of Exemplary Embodiments of the Invention

[0030]

[0031] figure 1 A shows the Figure 5 The conventional Cobra antenna shown is the same as the Cobra antenna. figure 1 B shows the cobra antenna of this example. First, describe figure 1 A and figure 1 Commonality between B.

[0032] figure 1 A and figure 1 Each cobra antenna 10 shown in B includes an antenna element 2 , a relay portion 3 , a coaxial wire 5 and a core 4 . Assuming that the wavelength of radio waves to be received is λ, the length of the antenna element 2 is ...

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PUM

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Abstract

Disclosed is a cobra antenna which is small, has a superior antenna gain performance, and receives minimum influence from the length of a coaxial wire. An antenna element having a length corresponding to a frequency of a broadcast wave to be received and a coaxial wire are connected to a relay unit which functions as a feeding point. A ferrite core around which the axial wire is wound one to three times is arranged at a position in the axial wire which is spaced from the relay unit by the same length as the length from the relay unit to the antenna element, and a high frequency blocking unit for blocking a high frequency current from the coaxial wire is provided on the front side of a connector of a receiving device to which the other side of the coaxial wire is connected.

Description

technical field [0001] The present invention relates to a cobra antenna which can be used as an antenna for a wide frequency band range from FM band to UHF band and which can be realized with a simple structure. Background technique [0002] Various forms of antennas are generally used as antennas for receiving various broadcast waves such as TV broadcasts or FM broadcasts. For example, dipole antennas or Yagi-Uda antennas are commonly used to receive TV broadcasts and FM radio. [0003] On the other hand, various broadcast waves are increasingly being received indoors, in a car, or while walking. Antennas used in such cases must be easy to handle, for example, to fit or install. [0004] Such easy-to-assemble or easy-to-handle antennas are typified by dipole antennas realized with simple-structural antenna elements. A cobra antenna is known as a specific embodiment of a dipole antenna. The cobra antenna is used by winding several turns of a coaxial wire around an iron c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01Q9/16
CPCH01Q9/16H01Q9/30H01Q1/3291
Inventor 吉野功高坪井觉
Owner SONY CORP
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