CN1083976A

CN1083976A - Antenna

Info

Publication number: CN1083976A
Application number: CN 93109031
Authority: CN
Inventors: 罗伯特·林斯·马修斯
Original assignee: Individual
Current assignee: Individual
Priority date: 1992-06-15
Filing date: 1993-06-15
Publication date: 1994-03-16
Also published as: EP0646274A1; JPH07509818A; EP0646274A4; WO1993026013A1

Abstract

The invention provides a kind of antenna that is easy to stretch (1), it has a plurality of antenna modules (2,3,4,5,6), they comprise a main structural components of being made by polymeric material, this polymeric material is mixed with or is impregnated with the electric conducting material of fiber and/or particle form to form a matrix, and each antenna module should so constitute, and makes fiber and/or particle provide required surface resistivity size for antenna module.

Description

Antenna

The present invention relates to a kind of antenna that can stretch flexibly.

With its operation wavelength requirement, antenna can be made multiple version according to actual needs.The multiband formula antenna that two kinds of the most frequently used antenna types are end feed-ins (or long line formula), and vertical antenna.A common feature of antenna system is to adopt conductive metallic material to constitute to receive and/or transfer element.For example, vertical antenna can be made by phosphor-copper or stainless steel.

The bar type car antenna is generally made by a plurality of telescopic hollow metal pipes.The manufacturing of this antenna has one " abundant " degree usually between pipe fitting, so that allow certain deformation in antenna uses, make the still extending or retraction of antenna.The elongation of antenna and shortening are handled and both can manually be realized, also can be finished by motor.

Telescopic car antenna has the some shortcomings part, for example is easy to permanent bending distortion and damage, perhaps the gross distortion so that the telescopic action that do not recur.Therefore the objective of the invention is to eliminate or alleviate the defective of above-mentioned existing antenna.

People's expectation provides a kind of collapsible antenna, and it can easily return to original shape, and prevents the permanent bending distortion.Therefore the present invention attempts to provide a kind of antenna, and it is easy to store collapsible antenna, and has flexibility, can prevent the damage of whip antenna.

Therefore, the invention provides a kind of antenna that is easy to stretch, it has a plurality of antenna modules, wherein each antenna module comprises a critical piece that is made of polymeric material, this polymeric material combines with fibrous and granular conductive materials or is immersed in the conductive materials, form a matrix, the structure of each antenna module should make fiber and/or particulate provide desired surface resistivity size for this antenna module.

An example of antenna of the present invention is described with reference to the accompanying drawings, wherein:

Fig. 1 (a) is the longitdinal cross-section diagram of five assembly collapsible antennas;

Fig. 1 (b) is to 1(e) be first (bottom) of this antenna each cross-sectional view to the 4th assembly; With

Fig. 2 is the longitudinal section of the 5th assembly (top).

In electrically conductive particles and the fiber any or the two preferably have high conductivity carbon.

For directed organic polymer fiber, polyacrylonitrile for example, polyacrylate comprises staple fibre or cellulose, carries out pyrolysis under 1500 ℃ or above temperature, then can obtain strong carbon (graphite) fiber.This fibrid also can be made by petroleum asphalt.If these fibers are attached in the construction package, then these assemblies are endowed high intensity.Various types of graphite fibres have different characteristics, and for example, they may have atypic structure, or have the polycrystal structure.The suitable dimensions scope of these fibers is that 0.2mm to 13mm is long.The graphite of some form can have higher conductivity than other form, and the graphite of these forms our major concern just.The resistivity of the carbon fiber of some industrial usefulness (inverse of conductivity) changes, for example can be from 18.0 μ Ω/m to 2.2 μ Ω/m or lower.

These fibers can be ultimate fibres, have aforesaid length, but in another embodiment, these fibers can adopt the long fibre form, both can be the multifilament that separates, and also can be the rove form.

Preferably adopt carbon granule as electroconductive particle.This carbon granule can be obtained by aforesaid arbitrary suitable mode, for example will be as the material with carbon element pyrolysis of petroleum asphalt.These particles can adopt arbitrary suitable method to make any required size, and identical with the situation of fiber, preferably select these particles have to the greatest extent can be high conductance.

Carbon granule helps to strengthen the surface resistivity of assembly, and they form a part thereon, thereby have improved electrically contacting between each assembly of telescopic antenna.

Selected carbon fiber generally can be by being mixed and made into rod or pipe with carbon fiber and epoxy compounds or mylar.Various fillers can be added in the described component, so that improve as characteristics such as hot strength and scratch hardness abilities.The fiber rod can be used for making whip antenna, and Guan Ze is used to make collapsible antenna, and the present invention adopts the part of rod as collapsible antenna.

The manufacturing of rod or pipe can the conversion by adding as the fortifying fibre of glass fibre and Kevlar.For example, glass fibre can be added in the carbonaceous fibrous matrix with the form of short fiber according to the fibre technology that is adopted, also can be around pricking or the suitable resin of adding in carbon fiber pipe.Further, the parts of collapsible tubes antenna of the present invention can be replaced by the hardware with suitable conductivity, and this is the same with the whip antenna that contains carbon fiber and particle, and the conductivity assembly is to be used for connecting the parts of antenna or as a loading coil.The outside of antenna can chromium plating or colouring.

It should be noted that the reinforcing material that is added itself conducts electricity, for example can use wire, as stainless steel wire.A kind of suitable example wiry is the BEKI-SHIELD stainless steel wire.The BEKI-SHIELD fiber of about 8 micron diameters can be as the rove that comprises about 1000 yarns.

As everyone knows, electric current can be collected on the conductive surface or near it, therefore, conducting particles and/or fiber can be expected and affacted on the matrix according to above-mentioned kelvin effect, they or be in contact with one another, or adjacent each other, electric current is directly occurred, or occur, and flow through polymeric material by electronics " tunnel " effect.

The polymeric material that forms resin is any suitable resin, and for example those are used to form the polyester or the vinyl of polyester tube and rod.

The polymeric material that is suitable for as matrix is LURANS, and it is also referred to as ASA by BASF(acrylonitrile/styrene/acrylic mixture) a kind of thermoplastic polyester of mixing as poly-(ethene) or poly-(butylene) terephthalate.

The polymer that also can adopt himself conduction is as the matrix of polymerization.

Collapsible tubular antenna of the present invention can be made close tolerance, has avoided spending the problem that causes by " abundant ", and has reduced the intrusion of ash and moisture content.The intrusion of dust and moisture content can damage common antenna.

Motor from extend antenna can be replaced by the pressure/vacuum that is connected on the engine, so the extension degree of antenna can not need be used Electric Machine Control.

The antenna of the antenna ratio routine of the general indication of the present invention is lighter and more flexible, and can not corrode.Therefore antenna of the present invention can increase its length, has greater flexibility than common metal antenna, and it may be used on the vehicles, also can be used for portable radio and TV aspect.

The assembly of antenna is generally tubular type, has only the assembly on top (inside) can change bar type into.The cross section of pipe or rod preferably is roughly circle, but also can adopt any other suitable shape.Additional reinforcing material can be used for the scope of boron fibre to the Kevlar fiber, and this reinforcing material can be with respect to polymeric matrices and orientation.This reinforcing material also can be applied to the outside of polymeric matrices, and for example the form with band is connected on the polymeric matrices.

People wish to increase surface resistivity, and this can be by applying the metal film coated of conduction or filming and realize from the teeth outwards.

Introducing conductive materials in the polymeric matrices or covering its lip-deep usability methods is to adopt to be pulled to tie up (Pultrusion) or traction winding process.

Though above-mentioned being pulled tied up technology (Pultrusion) to be used to make the tubular unit ratio useful, can provide good hoop intensity and smooth inside and outside surface smoothness, but other manufacturing process can be used also.For example, the manufacturing of tube element can be adopted injection-molded and/or extrusion process.

" flexibility " speech means that antenna returns or bounces back into the ability of its original state from its extended state in this manual.

In one embodiment, adopt the extruding synthetic method prepare ULTRABLEND(in this case ASA add poly-(butylene terephthalate)) mixture of the carbon fiber vertical and the carbon granule of 4% weight with 20%.

Draw following result of the test:

Bending strength: 18.5MPa

Bending coefficient: 10,141MPa

Tensile strength: 127.9MPa

Elongation: 3.3%

Notched impact strength: 58.5J/m

Reverse notched impact strength: 319.5J/m

Heat reflection temperature: 219.7 ℃

In one or each antenna tubular assembly, can insert one or more metal linings according to the present invention, so that further improve hoop intensity.In addition, the metal lining that is positioned at each assembly one end helps to admit adjacent assembly.

Describe in conjunction with the accompanying drawings now, " carbon fiber ", " carbon fiber pipe linear element " refer to the electric conducting material that comprises foregoing fiber and particulate.

Label 1 expression collapsible antenna of the present invention, the end barred body of label 2 expression solid carbon fiber, label 3 expressions have the carbon fibre pipe fitting of narrow endoporus, and

label

4,5 and 6 expressions increase the carbon fibre pipe fitting of diameter gradually.

Label 7 is illustrated in the end button on first end of end barred body 2, preferably make by carbon fiber, label 8 is the second end districts of rod 2, with label 9 are the metal linings that directly are enclosed within the second end 8 outsides, it be directly arranged in the lining 9A co-operation of pipe fitting 3 first end inboards, prevent that therefore rod 2 from extracting from pipe fitting 3, then a spring flange arrangement 10 that changes its course in the surface, it is positioned near the 2nd end of pipe fitting 3, it and near the inboard fairlead 10A collaborative work pipe fitting 4 first ends.Similarly, flange arrangement 11, lining 11A, flange arrangement 12 and lining 12A work with respect to affiliated separately pipe fitting in a similar fashion, are used to admit each

assembly

4 and 5, make antenna have Telescopic.At last, the spring flange arrangement 13 of big endoporus provides the electric and/or mechanical connection with the traffic tool vehicle body antenna.Label 14 expression engagement nylon fibers, push away/end of drawing device, it is to be used to pull out and selected mechanical mechanism when regaining collapsible antenna of the present invention.

Polyphone contact (not shown) also can combine with each spring flange arrangement, and these flange arrangement provide each interelement being electrically connected at antenna, and each contact zone all connects the inboard of adjacent component.

Claims

1, a kind of easily flexible antenna, it has a plurality of antenna modules, wherein each antenna module comprises a main structural components that is made of polymeric material, described polymeric material is added with or is impregnated with electric conducting material, these electric conducting materials are that fiber and particle form are to form a matrix, each antenna module should be made like this, and fiber and/or particulate are provided corresponding to the desired surface resistivity size of this antenna module.

2, antenna according to claim 1, wherein one or two of conductive fiber and particulate is the carbon of high conductivity.

3, according to the antenna of claim 1 or 2, wherein can in matrix, add filler, in order to strengthen required physical characteristic.

4, according to any the antenna in the claim 1 to 3, wherein can in matrix, add fortifying fibre.

5,, wherein apply the metal coating or the overlay film of one deck conduction, so that the surface resistivity of increase to be provided on the surface of each antenna module according to any the antenna in the claim 1 to 4.

6, according to any the antenna in the claim 1 to 5, wherein conductive fiber and/or conducting particles are to be present in the matrix with finite concentration, thereby they are contacted each other or adjacent, make that electric current can be directly or occur and flow through polymeric material by electron tunneling effect.

7, according to any the antenna in the claim 1 to 6, wherein polymeric material is a kind of acrylonitrile/styrene/acrylic polymer that is mixed with thermoplastic polyester.

8, according to the antenna of claim 7, wherein add the have an appointment carbon fiber of 20% weight and the carbon particle of about 4% weight.

9, according to any the antenna in the claim 1 to 8, wherein each antenna module comprises a lining or flange component, it is positioned at the opposite end of each antenna module, described lining or flange component directly are provided with by following mode, be that adjacent antenna module is admitted mutually with mating, and can carry out stretching motion mutually.

10, according to the antenna of claim 9, wherein the flange component in each antenna module is to constitute the feasible complete spring assembly that forms like this.