Cobra antenna

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...

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