JPH0634315U - Loop antenna - Google Patents

Abstract

(57) [Summary] (Modified) [Purpose] To provide a loop antenna capable of improving receiving sensitivity without increasing the number of parts. [Structure] The antenna conductor 10 is wound around a frame body made of a synthetic resin mixed with magnetic powder.
Is a conductor 2 surrounded by an insulator 1 mixed with magnetic powder. [Effect] Besides the frame and the antenna conductor, there is no need for magnetic parts for converging radio waves, so the number of parts can be reduced, and the strength of the radio waves interlinking with the conductor can be increased due to the magnetism of the insulator and frame. , The receiving sensitivity of the antenna is improved.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a loop antenna capable of improving reception sensitivity.

[0002]

[Prior art]

 A loop antenna formed by winding a conductor in a loop is often used as a directional antenna only for reception. The loop antenna has the advantage that the reception frequency band can be widened, but there is a limit to improving the reception sensitivity because the conductor is simply wound around the frame.

The inventor of the present invention previously proposed in Japanese Patent Application No. 4-34569 a loop antenna in which a magnetic material is arranged on a surface surrounded by conductors. The loop antenna disclosed in Japanese Patent Application No. 4-34569 has improved antenna reception sensitivity due to the magnetic material placed, but since it is composed of three parts, the antenna conductor, the frame, and the magnetic material, the number of parts is reduced. Also, the number of steps may be increased.

[0004]

[Problems to be solved by the device]

 An object of the present invention is to provide a loop antenna capable of improving receiving sensitivity without increasing the number of parts.

[0005]

[Means for Solving the Problems]

 In the present invention, in a loop antenna in which a conductor is formed in a loop shape, a frame body made of a synthetic resin mixed with magnetic substance powder and a conductor covered with an insulator mixed with magnetic substance powder are used. Characterize.

[0006]

【Example】

 FIG. 1 shows a cross-sectional view of the antenna conductor 10. The periphery of the conductor 1 is covered with an insulator 2 mixed with magnetic powder. FIG. 2 shows a cross-sectional view of the loop antenna. Reference numeral 11 is a frame body made of synthetic resin mixed with magnetic powder, and 10 is an antenna conductor having a structure as shown in FIG. There are insulators and frames mixed with magnetic powder around the conductors, and their magnetism concentrates the radio waves in the air to increase the intensity of the radio waves interlinking with the conductors. improves.

In a test conducted by the inventors, a polypropylene-based material for the frame resin, a vinyl-based material for the insulator, and a ferromagnetic ferrite-based material for the magnetic material powder were used. When the content was set to about 70 wt%, the sensitivity was improved by about 3 dB as compared with the normal loop antenna. However, the present invention is not limited to the above test materials.

[0008]

[Effect of device]

 As described above, the loop antenna of the present invention is one in which the frame around which the conductor is wound and the insulator covering the periphery of the conductor are formed of a synthetic resin mixed with magnetic powder or an insulator. . As a result, it is composed of two parts, the antenna conductor and the frame, so the number of parts can be reduced.

Since the insulator mixed with the magnetic powder has flexibility, the antenna itself has good formability, and the synthetic resin mixed with the magnetic powder is processed and formed from a magnetic material such as ferrite. Since it has good properties, it is easy to obtain a desired shape. Due to the magnetism of the magnetic powder mixed in the insulator and frame, the intensity of radio waves interlinking with the conductor is increased, and the receiving sensitivity of the antenna is improved.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an antenna conductor used in the loop antenna of the present invention.

FIG. 2 is a cross-sectional view of an embodiment of the loop antenna of the present invention.

[Explanation of symbols]

1 Insulator mixed with magnetic substance powder 2 Conductor 10 Antenna conductor covered with insulator mixed with magnetic substance powder 11 Synthetic resin frame body mixed with magnetic substance powder

Claims (2)

[Scope of utility model registration request] 1. A loop antenna in which a conductor is formed in a loop shape, wherein the conductor is coated with an insulating material mixed with magnetic powder. 2. A loop antenna having a structure in which a frame body is formed of a synthetic resin mixed with magnetic powder, and the conductor of claim 1 is wound around the frame body.