JPH04110010U - Flexible antenna for mobile radio - Google Patents

Abstract

(57) [Summary] [Purpose] To make an antenna having a structure in which a flexible tube is used as a core material and a conductor is wound around the outer circumference of the core material difficult to break without impairing its flexibility and springiness. [Structure] Powder 1 is densely filled inside a flexible tube 2, and both ends of the tube are closed. Then, the conductors 2A and 2B are spirally wound around the outer periphery of the flexible tube. As the powder, for example, a high dielectric constant material is used, and if necessary, this powder is mixed with a viscous material or an elastic material to be filled.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention is a flexible cable suitable for portable radio equipment, especially mobile phones, which have recently become popular. Regarding antennas.

0002

[Conventional technology]

For this type of antenna, a conducting wire is wound spirally around the outer circumference of a hollow flexible tube. There are some with a similar structure.

0003

[Problem that the idea aims to solve]

By the way, for example, in the case of antennas used for mobile phones, antennas with flexibility and spring properties are used. Moreover, it is required not to break. However, the above conventional antennas are flexible and Although it has spring properties, it has the problem of being prone to breaking if it is extremely curved.

0004 The present invention uses this type of flexible tube as the core material, making it an antenna that is difficult to break. The purpose is to provide

[0005]

[Means to solve the problem]

In order to solve the above problems, the flexible antenna for portable radio equipment of the present invention has the following features: A conductor is spirally wound around the outer circumference of a flexible tube and powder is filled inside the tube. It is characterized by Further, in the device of claim 2, the powder is used as a viscous material or an elastic material. It is characterized by being mixed in a synthetic material and then filled into a tube. Request more The invention of claim 3 is characterized in that a high dielectric constant material is used as the powder. ing.

[0006]

[Effect]

If the flexible tube is hollow, it will tend to break at the U-shaped bend, for example. Ru. In order for the tube to break at this point, the cross section of the tube must change from a circular shape to a flat shape. It is necessary to If the inside is hollow, there is no effect to prevent the deformation. This allows it to deform and eventually break, but the inside is filled with powder. In this case, the powder inside exerts a force that resists deformation. In other words, the force that tries to deform acts from the outer shell of the tube, and the powder inside rebels against it. And that's it to prevent deformation and breakage.

[0007]

【Example】

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a side view showing a partial cross section of the antenna of the embodiment. with this antenna In this example, a flexible resin tube 2 with a powder 1 densely filled inside is used as a core material. It is. Both ends of the tube 2 are closed with plugs or heat fusion.

[0008] On the outer periphery of this tube 2, two conductors 3A and 3B are arranged at a constant pitch. It is wound spirally at intervals. Both conductors 3A and 3B are the base ends of the antenna It is joined at the section.

[0009] An antenna with this structure uses a flexible tube 2 as the core material. It has flexibility and springiness. Moreover, the inside of tube 2 is filled with powder 1. Because it is durable, it does not easily break.

[0010]The powder 1 may be directly filled into the tube 2 as a powder, or may be mixed with a viscous material or an elastic material in advance and then filled. Furthermore, if a high dielectric constant material is used as the powder, for example a material with a relative dielectric constant ε _r = about 10, the wavelength of radio waves propagating through it will be shortened to about 1/3, so the same frequency characteristics can be maintained. In this case, the length of the antenna can be reduced to 1/3. Examples of the high dielectric constant material include titanium oxide, calcium titanate, barium titanate, strontium titanate, lead titanate, and zirconium titanate.

[0011]

[Effect of the idea] As explained above, the flexible antenna of the present invention is Since it is filled with powder, it has flexibility and springiness and is difficult to break.

[Brief explanation of drawings]

FIG. 1 is a side view of an embodiment of the present invention.

[Explanation of symbols]

1 Powder 2 Flexible tube 3A, 3B conductor

Claims (3)

[Scope of utility model registration request] 1. A flexible antenna for a portable radio device, characterized in that a conductor is spirally wound around the outer periphery of a flexible tube, and powder is filled in the tube. 2. The flexible antenna for a portable radio device according to claim 1, wherein the powder is mixed in a viscous material or an elastic material. Claim 3: Claim 1, wherein the powder is a high dielectric constant material.
Or the flexible antenna for a portable radio device according to 2.