JPH04110012U - Helical antenna for portable radio equipment - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a helical antenna in which conductor pitch deviation is unlikely to occur. [Structure] Of the wire bundles (band-like elements) 2A wound clockwise, three sets in a non-contact relationship are made up of conductor wires as wire bundles 2A _D , and the others are wire bundles made of insulator wires. A shaped braid 2 is constructed, and the outer periphery of the round bar 1 is covered with it. This is then cut into appropriate dimensions to construct the antenna.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention is a helical cable suitable for portable radio equipment, especially mobile phones, which have recently become popular. Regarding the antenna.

0002

[Conventional technology]

Conventional helical antennas of this type have a single or It had a structure in which multiple conductive wires were simply wound spirally in one direction.

0003

[Problem that the idea aims to solve]

Therefore, the pitch of the conductor wires tends to shift, and high characteristics may not be obtained. there were. In addition, in order to prevent pitch deviation, it is possible to provide a means to hold the conductor, making production easier. The problem was that it was troublesome and costly.

0004

[Means to solve the problem]

The helical antenna of this invention was created to solve the above problem, and the It consists of a braid made by weaving a plurality of wound and left-handed band-like elements, and the above-mentioned band-like elements are At least one thread of the element is made of a conductor, the other part is made of an insulator, and the other is made of a conductor. The belt-like elements are held and fixed in a non-contact state. Further, in the antenna of claim 2, a plurality of wires are bundled as the band-like element. It is characterized by the use of a bundle of twisted strands.

[0005]

[Effect]

At least one of the strip elements is made of antenna conductor, and the others are insulated. In the braid, the strip elements made of conductors are not in contact with each other. The pitch of the strip elements made of conductors is It is difficult to change and is kept constant.

[0006]

【Example】

An embodiment of the present invention will be described below with reference to the drawings. What is shown in FIG. 1 is a part of the antenna of the embodiment. This antenna is an insulator. The outer periphery of the round bar 1 is covered with a cylindrical braid 2, and a resin coating 3 is placed on top of the braid 2. It has a structure covered with

The braid 2 used here is constructed by alternately weaving a right-handed helically wound wire bundle (band-like element) 2A and a left-handed spirally wound wire bundle (band-like element) 2B. At least one set of the right-handed helically wound wire bundle 2A is made of a conductor, and the other wire bundles 2A and 2B are all made of an insulating material. In this example, three sets of the right-handed wire bundle 2A are made up of conductors, and the wire bundles 2A _D each made up of three sets of conductors are arranged every other set. Note that a strand bundle made of a conductor is a bundle of a plurality of conducting wires, and a strand bundle made of an insulating material is a bundle of a plurality of fibers made of an insulating material.

[0008] When composing multiple wire bundles with conductors as shown above, there is no contact with each other when weaving them together. For example, conductor strands are placed at intervals between each pair so that a smooth spiral conductor band is formed. Place the bundle. By doing this, the wire bundles made of conductors are not in contact with each other. They are strongly held in line with each other at a constant pitch. Therefore, in order to cause pitch deviation, Peg.

[0009] Also, since this antenna was constructed with braid 2, it was naturally produced using a conventional braid knitting machine. It can be easily constructed by cutting the braid into an appropriate length.

[0010] In the above embodiment, the wire bundles 2A and 2B are used as the strip elements constituting the braid 2, but as shown in FIG. The braid 3 may be constructed using a shaped body. In that case, for the element 3A _D made of a conductor, a rectangular conductor, a metal foil, or a laminate tape made by laminating a metal foil and an insulating material can be used. Furthermore, for elements made of insulating material, ordinary insulating tape can be used.

[0011] Further, the antenna may be configured by combining the above two embodiments. for example, Some strip elements are composed of wire bundles, and other elements are composed of wire bundles. They are made of tape, etc., and then woven together to form a braid.

0012

[Effect of the idea]

As explained above, the helical antenna of the present invention uses conductor strip elements. Because it is composed of a braided insulator strip element, it is a conductor strip element. The position of the element is reliably maintained. Therefore, it is good without causing pitch deviation. It is possible to maintain good antenna characteristics. In addition, since it is composed of braid, It can be made like a normal braid using a braiding machine, and then easily cut afterward. This has the advantage that an antenna of a predetermined size can be obtained and the manufacturing cost is low.

[Brief explanation of drawings]

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

FIG. 2 is a side view of another embodiment of the present invention.

[Explanation of symbols]

1 Round bar made of insulator 2 Braid 2A, 2B Wire bundle 2A Wire bundle 3 made of _D conductor Braid 3A, 3B Strip element 3A Strip element made of _D conductor

Claims (2)

[Scope of utility model registration request] [Claim 1] Consisting of a braid of a plurality of right-handed and left-handed band-like elements, at least one of the band-like elements is made of a conductor, the others are made of an insulator, and the band-like elements made of the conductor are connected to each other. A helical antenna for portable radio equipment characterized by being held and fixed in a non-contact state. 2. The helical antenna for a portable radio device according to claim 1, wherein the band-like element is composed of a bundle of strands of strands.