CN1200231A - Windowpane having electromagnetic shielding ability - Google Patents

Windowpane having electromagnetic shielding ability Download PDF

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Publication number
CN1200231A
CN1200231A CN 97191176 CN97191176A CN1200231A CN 1200231 A CN1200231 A CN 1200231A CN 97191176 CN97191176 CN 97191176 CN 97191176 A CN97191176 A CN 97191176A CN 1200231 A CN1200231 A CN 1200231A
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CN
China
Prior art keywords
wire antenna
antenna unit
electromagnetic shielding
glass pane
capability
Prior art date
Application number
CN 97191176
Other languages
Chinese (zh)
Inventor
川崎公雄
吉田义政
山野外上和志
平野浩太郎
笹田雅昭
高坂修一
平井淳一
横田依早弥
Original Assignee
鹿岛建设株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to JP229557/96 priority Critical
Priority to JP22955796 priority
Priority to JP145226/97 priority
Priority to JP9145226A priority patent/JPH10335877A/en
Application filed by 鹿岛建设株式会社 filed Critical 鹿岛建设株式会社
Priority to JP233411/97 priority
Priority to JP09233411A priority patent/JP3079364B2/en
Publication of CN1200231A publication Critical patent/CN1200231A/en

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Classifications

    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01QANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00Details of, or arrangements associated with, antennas
    • H01Q1/52Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure
    • H01Q1/526Electromagnetic shields
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01QANTENNAS, i.e. RADIO AERIALS
    • H01Q15/00Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
    • H01Q15/0006Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices
    • H01Q15/0013Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices said selective devices working as frequency-selective reflecting surfaces, e.g. FSS, dichroic plates, surfaces being partly transmissive and reflective

Abstract

A windowpane which can be treated for electromagnetic shielding by selecting radio waves of a required frequency band only and, even when the glass plate is installed, the pane can be easily treated for electromagnetic shielding without performing conductive treatment with a conductor, etc., to a peripheral metallic sash, etc. Linear antenna elements (5) having such lengths that can resonant with radio waves to be shielded are regularly arranged on the surface of the pane or between panes as electromagnetic shielding elements by taking the electromagnetic field reflecting equivalent areas (scattering opening areas) or electromagnetic field reflecting equivalent volumes (scattering opening volumes) of the element into consideration and electromagnetic waves are attenuated by scattering the waves with the elements (5).

Description

Glass pane with capability of electromagnetic shielding

Technical field

The present invention relates to have the glass pane of capability of electromagnetic shielding, and this glass pane is the employed glass pane of window of building, in addition, can also be the glass pane of the vehicles such as automobile, train, or the various glass panes such as glass pane of daily apparatus such as (room) partition, chest.

Background technology

In the scope of legal provisions, use the individual used radiotechnics to carry under the situation such as apparatus, produced necessity the electromagnetic shielding of building, interior of building or vehicle interior from the safe and secret purpose of the phase mutual interference countermeasure of the utilizing again of frequency, electric wave, communication.

For example, special-purpose PHS in the enterprise (special-purpose in the-house of working on one's own) is set in the building of appointment, or Wireless-LAN (WLAN) time, owing to all make according to technical specification, its technology contents is disclosed, and the measuring apparatus of analyzing usefulness is existing commercially available, so just can easily visit professional within doors employed communication information outside the room, the eavesdropping of Content of communciation just becomes possibility.

Using in the phs terminal of dual-purpose with the public, to wait the leak protection that carries out Content of communciation be unusual difficulty with password is set, therefore for keep safe and secret generally have only to adopt prevent the electromagnetic shielding method of electro magnetic outside communications zone.

In addition, because available channel is limited, so use the platform number to be necessary according to using the zone to shield so that electric wave is closed in order to guarantee as far as possible.

In addition, also produced the necessity of electromagnetic shielding in the following cases: medicine equipment or patient are interfered and the situation that causes breaking down at medical field electromagnetic waves such as hospitals; At the restaurant, the public place also has idle occasions such as will making portable phone when requiring spectators to keep quietness in places such as music halls for preventing because of using portable phone that other people are produced when bothering in the vehicle etc.

Electromagnetic shielding for electric wave is used at present widely, and people have carried out the research of a lot of employing metallic plates, metal grill or electric wave absorbing materials.

For example, electromagnetic shielding as the building structure, each floor adopts deck and other iron plate etc. just can carry out enough electromagnetic shieldings in the past, adopts the method for seamlessly sticking Copper Foil or metal grill on the dividing plate of externally wall and room also can carry out effective electromagnetic shielding to microwave band.

In contrast, from guaranteeing the viewpoint of optical transmission, it also is difficult carrying out electromagnetic shielding to windowpane.Therefore, replace wall, this wall is made above-mentioned electromagnetic shielding structure in order to carry out electromagnetic shielding to remove the glass pane in each room of building fully; But the result that people do not have the inaccessible living environment of feeling of extreme in the visual field has appearred imposing in this case.

In addition, on glass pane, apply electromagnetic shielding structure people within it portion put wire netting into.For example, just need very close grid about 0.1mm, be damaged though carried out the electromagnetic shielding transparent feel for the employed electric wave of PHS (frequency is 1.9GHz one band) having been carried out electromagnetic shielding, so just not talkative it be good living environment.

As other examples that apply the electromagnetic shielding structure on glass pane, extremely thin metal evaporation films such as handlebar tungsten, aluminium are layered in glass surface or inner method all sidedly, and have obtained practicality.But well-known, can make its decay 20~30dB (=1/100~1/1000) with this method to PHS (1.9GHz) or WLAN (2.45GHz) maximum.Adopt this method, the minimizing of visible light is limited within 30~35%, so without limits to the visual field.

But, adopt this method, though can neither destroy the electric wave that daylighting or open sense shield intrusion outside the room again to a certain extent, but owing to all shielding in the frequency band range, although having carried out electromagnetic shielding really does like this and has but masked the common communication that should not shield, for example, daily communication such as the emergency communication used of public's portable phone, beep-pager, various broadcasting (TV), police or fire-fighting, cordless telephone.

The object of the present invention is to provide such glass pane with capability of electromagnetic shielding, it can eliminate the improper part of above-mentioned existing example, do not destroy daylighting and visuality, and can only select the electric wave band of necessary frequency to carry out electromagnetic shielding, need not in addition to utilize the energising of electric conducting material to handle or the ground connection processing the gap portion between the electromagnetic shielding materials such as metal frame of window frame.

Disclosure of an invention

To achieve these goals, the 1st main points of the present invention are: with the wire radio-cell of the length (electrical length) of the electric wave phase resonance that will shield as the electromagnetic shielding unit, consider the ELECTROMAGNETIC REFLECTION equivalent area or the volume of this unit, the reflection field of promptly considering to make electric wave is overlaid seamlessly, each antenna element is arranged between glass surface or the glass plate regularly, by radio wave scattering being decayed with this wire radio-cell.

The 2nd main points of the present invention are: the open-ended shape is made in the wire antenna unit, make its length (electrical length) on one side of extending from the center 1/4 wavelength (in the time of a shape is 1/2 wavelength) for the electric wave that will shield; Perhaps the wire antenna unit is a ring-type circuit shape, makes its girth (electrical length) identical with the wavelength of the electric wave that will shield.

The 3rd main points of the present invention are: make size, variform more than 2 kinds the wire antenna unit combination and line up, and make the wire antenna unit of the wire antenna unit of open-ended shape and ring-type circuit shape combined; Perhaps make the wire antenna unit of the different open-ended shape of length combined each other, or make the wire antenna unit of the different ring-type circuit shape of length combined each other.

The 4th main points of the present invention are: the wire antenna unit of open-ended shape makes the end on each limit line up near the center of adjacent wire antenna unit; And the wire antenna unit of open-ended shape, its wire antenna cell mesh is a ring-type circuit shape.

The 5th main points of the present invention are: the mutual arrangement pitches in wire antenna unit considers that the relation of attenuation determines.

The 6th main points of the present invention are: the low material of specific insulation is selected according to the shielding properties that it is required in the wire antenna unit, preferably is 5 * 10 -8(below the Ω-m); And the wire antenna unit adopts good conductivity, durability, material that climate adaptability is good, and for example silver is a small amount of by sneaking into, and for example about 5% glassy substances makes itself and glass integrated.

If adopt the present invention of claim 1~claim 3, then the metal area occupied reflected electromagnetic wave energy of antenna is not only in the wire antenna unit, and is near the electromagnetic field in certain limit scope reflective metals part widely.And, can be by considering that its electromagnetic field reflection equivalent area or equivalent volume are this antenna element plane earth or three-dimensional be configured in the space or carry out electromagnetic shielding on the non-conductive material.In addition, owing to have spacing, and be not comprehensive covering, so do not destroy daylighting and visuality.

And, patterned little wire antenna unit, by specifying its length just can shield specific frequency, consequently because other electric waves are passed through, so can not shield police, fire-fighting with radio waves such as radio wave, television radio wave etc., from the necessary electric wave of collected outside information, and the specific electric wave that only prevents to use at interior of building has not only improved level security but also can carry out the utilization again of channel to external leaks.

In addition, such wire antenna unit is to shield by reflection substantially, and owing to absorbed (reception) electric energy major part is absorbed as thermal losses, so do not need to make the conductings such as metal frame of wire antenna unit and window frame to come, just can not be subjected to the conduction connection to limit and be provided with freely its ground connection.

In addition,, ring-type circuit shape is made in the wire antenna unit or have the open-ended shape of directivity, electric wave that just can all plane of polarizations of correspondence although plane of polarization is not consistent but has various incline directions in the actual electric wave.

Adopt the described the present invention of claim 4~claim 7, combined and line up regularly by making the different wire antenna unit of length, just can carry out electromagnetic shielding to the electric wave of a plurality of frequency bands; Like this, just can carry out corresponding widely by the electric wave of the electric wave that will shield being appointed as a plurality of frequency bands.For example about portable phone, just can with 900MHz with, and the whole of 2 frequency bands that 1.5GHz was distributed be that object carries out electromagnetic shielding.

Adopt the described the present invention of claim 8,, just can prevent the located adjacent one another and mutual interference of generating unit in high electric field place by adopting the adjoining configuration in high electric field place and low electric field place of wire antenna unit.In addition, can improve cell density, thereby improve the degree of decay.

Adopt the described the present invention of claim 9, the wire antenna unit of open-ended shape is a ring-type circuit shape partly by making its line unit, just can increase its reflection equivalent area, broad in band and high decay is changed into be possible.

Attenuation in order to ensure height preferably makes the adjacent near-earth of antenna element arrange as far as possible; On the contrary, if it excessively is arranged on the glass then can causes a visual problem (keep off) contiguously.If adopt the described the present invention of claim 10, exist dependency relation by arrangement pitches and the attenuation of finding the wire antenna unit, attenuation according to necessity decides the mutual arrangement pitches in wire antenna unit, just can guarantee big gap each other, guaranteeing better sense of vision in glass at the wire antenna element as far as possible.

Preferably reduce the loss resistance of wire antenna unit in order to ensure the attenuation of height as far as possible.Preferably realize lowering loss resistance by increasing line width for this reason.But the line width that increases the wire antenna unit can cause destroying the optical transmission of the glass when being arranged with this unit.When the live width that makes the wire antenna unit is the 0.5mm left and right sides, if adopt the described the present invention of claim 11, by preferably making specific insulation 5 * 10 -8(Ω m) is following just can to guarantee sufficient performance.

When similarly reducing the loss resistance of wire antenna unit as possible, preferably adopt the low material of resistance in order to ensure the attenuation of height.Material copper, silver, gold as the wire antenna unit are best suited for.But the price height of gold, and copper is because the oxidation resistance value can raise.If according to claim 12, with regard to adopt price very not high, do not have the silver that the danger that resistance value rises takes place because of oxidation; And a small amount of by sneaking into, for example about 5% glassy substances makes itself and glass integrated, just can make the life-span of wire antenna unit and glass roughly the same.

The simple declaration of accompanying drawing

Fig. 1 is the oblique view of the 1st embodiment of expression glass pane of the present invention.

Fig. 2 is the pith front elevation of the 1st embodiment of expression glass pane of the present invention.

Fig. 3 is the key diagram of wire antenna unit when being set to short circuit type idol level antenna.

Fig. 4 is first key diagram of the principle of the electromagnetic shielding method in the expression glass pane of the present invention.

Fig. 5 is second key diagram of the principle of the electromagnetic shielding method in the expression glass pane of the present invention.

Fig. 6 is the front elevation that disposes the glass pane of wire antenna unit.

Fig. 7 is the oblique view of the 2nd embodiment of expression glass pane of the present invention.

Fig. 8 is the front elevation of the wire antenna unit of the 2nd embodiment.

Fig. 9 is the experimental result curve chart of performance of glass pane of the present invention of confirming to have disposed the wire antenna unit of Y shape.

Figure 10 is the key diagram of the configuration of expression when the wire antenna unit done across.

Figure 11 is the key diagram of variation of the wire antenna of expression ring-type circuit shape.

Figure 12 is the key diagram of variation of the wire antenna of expression open-ended shape.

Figure 13 is the front elevation of variation of the wire antenna of expression open-ended shape.

Figure 14 is the oblique view of the 3rd embodiment of expression glass pane of the present invention.

Figure 15 is the plane graph of one of combination example of the wire antenna unit of the wire antenna unit of expression ring-type circuit shape and open-ended shape.

Figure 16 is the curve chart of the effectiveness of expression wire antenna shown in Figure 13 unit.

Figure 17 is the key diagram of the variation of expression unit that the wire antenna unit combination of the wire antenna unit of ring-type circuit shape and open-ended shape is got up.

Figure 18 is the key diagram of expression example that the wire antenna unit combination with one another of the different open-ended shape of length is got up.

Figure 19 is the key diagram of expression example that the wire antenna unit combination with one another of the different ring-type circuit shape of length is got up.

Figure 20 is the key diagram of expression as the combination example of the wire antenna unit of 3 frequency bands.

Figure 21 is the key diagram of experimental facilities of the shielding properties in the gap of confirming that glass pane is mutual.

Figure 22 is the experimental provision front elevation that is used for observing the relation of the arrangement pitch of wire antenna element and attenuation.

Figure 23 is the vertical profile side view of experimental provision that is used for observing the relation of the arrangement pitch of wire antenna element and attenuation.

Figure 24 is the experimental result curve chart of the relation of the arrangement pitch of wire antenna unit and attenuation.

For implementing optimum shape of the present invention (most preferred embodiment)

Below, with reference to accompanying drawing embodiments of the invention are elaborated.Fig. 1 is the oblique view of the 1st embodiment of the expression glass pane with capability of electromagnetic shielding of the present invention.1 is glass pane in the drawings, the 2nd, window frame, length and the corresponding wire antenna of the electromagnetic frequency unit 5 that will shield have been considered electromagnetic field reflection equivalent area or volume and have been arranged in regularly on the glass pane 1, made electromagnetic wave attenuation with this wire antenna unit 5.

At first, the basic principle to company related to the present invention describes.Be positioned at aerial occasion at conductor piece, when electromagnetic wave incided this face, a part was reflected, and a part is absorbed, and remaining sees through.Different by the electromagnetic wave attenuation amount that this conductor piece causes because of the shape and the size of conductor piece.As shown in Figure 3, if with the wire antenna unit (dipole antenna) 3 of this conductor piece as open-ended, then it absorbs a part in reflection electromagnetic wave.

As shown in Figure 4, with the dipole antenna unit 3 of the half-wavelength (λ/2) of the parallel placement of plane electromagnetic field, the area that is not only the metal part branch of antenna element receives electromagnetic wave energy, and absorbs near the electromagnetic field the metal covering.Though its expansion is uneven, equivalent cross-sectional area Ae can represent its calculated value with following formula 1.

[formula 1]

Ae=0.13 λ 2(areas of λ/2 * λ/4)

In this equivalence sectional area Ae scope electromagnetic about 3/4 is reflected, and about 1/4 of remainder becomes reception electrical power (electric energy).Here it is effective aperture.

As shown in Figure 5, as the reception input resistance of the wire antenna of the half-wavelength supposing (λ/2) is zero, promptly is desirable harmless antenna element, and then electric energy all is reflected back toward the space, and its equivalent area just becomes 4 times (scattering apertures) of above-mentioned effective aperture; If the unit that such wire antenna unit 3 is constituted is arranged on the glass pane 1 as shown in Figure 6, then demonstrate as the reflection of electromagnetic wave effect of having pasted metal film according to above-mentioned equivalent area 4 * Ae (scattering aperture).Antenna element generally has the frequency interdependence, this characteristic and receiving terminal resistance=0th, the fundamental characteristics of the unit that is made of this wire antenna unit 3; If wire antenna is lossy, a then electromagnetic part is drawn by aerial loss resistance as electric energy.

And because wire antenna unit 3 is scattered, so it does not damage the daylighting and the visuality of glass pane 1.In addition, constitute the thickness of the lead of wire antenna unit 3, select thin getting not hinder the visual field, and the few size of loss.

1885~1950MHz is existing person-to-person communication (PHS-JAPAN, PCS-US, DECT-Europe) reach the frequency band that entered practical FPLMTS (Future Public Land Mobile Telephone System) from 2000 Christian eras, 2420~2480MHz is by the determined ISM of ITU (Industrial-Scientific-Medical-industry, science, medical treatment) frequency band of usefulness, in building,, also be used for the linear accelerator that microwave oven or high-power nondestructive inspection are used except distributing to WLAN.

The hypothesis frequency is 1.90GHz under the situation of PHS, and then wavelength is λ=about 158mm; The hypothesis frequency is 2.45GHz under the situation of WLAN, and then wavelength is λ=about 122mm; Therefore wire antenna unit 3 separately is equivalent to 4 * Ae=12,980mm 2(PHS) area and 4 * Ae=7,740mm 2(LAN) area; As long as consider above-mentioned electromagnetic field reflection equivalent area they are arranged between glass surface or the glass plate regularly, even also their dispersed arrangement get final product.

But, as shown in Figure 6 a horizontal row is lined up in wire antenna unit 3, because actual electromagnetic plane of polarization is not so horizontal row, so just not can do with various plane of polarizations.So, wire antenna 3 is made open-ended shape or ring-type circuit shape with following such directivity.Do like this and just can tackle the different electromagnetic wave of all face tilt directions.

Fig. 1, Fig. 2 represent the 1st embodiment of the present invention.Here make wire antenna 5 be the open-ended shape, the electromagnetic wavelength that shield is λ, and the equivalent relative dielectric constant when having arranged the wire antenna unit on glass is under the situation of ε q, makes wire antenna 5 about for the length on one bar limit The shape of falling Y unit.That is, because ε q is 1 in air, so wire antenna 5 is from electromagnetic 1/4 wavelength of length for shielding on one side that center 5a extends.If but this wire antenna 5 is configured on glass because glass and interfacial dielectric constant, on one side length to change.

In addition, as the glass pane 1 that above-mentioned wire antenna unit 3 or wire antenna unit 5 are set, the glass of leaded, tin or grey antisolar glass etc. are suitable; And, can consider the metal paste silk screen printing of silver, copper, gold etc. or the method for sticking film as the method that when considering electromagnetic field that this antenna element has reflection equivalent area, wire antenna unit 3 or wire antenna unit 5 is arranged in regularly between glass surface or the glass plate.

Dispersing or be used for regulating sunshine amount when wherein, sticking film and can also be used to preventing glass breakage.In addition, also can append construction after construction, be relatively inexpensive method.As thin-film material, can be on film of synthetic resin such as polyimide film, polyester film, polyethylene film, with rotten quarter method or layered manner or stencil printing wire antenna 5 is made line pattern; Again it is attached on glass etc.

Above-mentioned rotten quarter method, copper-surfaced paper tinsel on as the film of flexible PCB, and it is used as basis material covers line pattern and with solvent remainder is dissolved.This is the method identical with general printed circuit board (PCB).In contrast, stencil printing is that employing method of metal such as printed silver, gold paste on basis material forms line pattern.

For the performance of the electromagnetic wave shielding glass of the wire antenna 5 of confirming to dispose above-mentioned Y shape, glass surface with silver-colored paste sintering, printed wire antenna 5 and tested.This experimental result is shown in Fig. 9.

Confirming that the maximum attenuation amount is 35dB (centre frequency 1.9GHz), is about 35MHz as the 30dB attenuation bandwidth of target, has enough shielding propertiess for the electromagnetic frequency of utilization scope of PHS.

In the specification of this glass shown in the following table-1, shown in table-2, test summary.

[table 1] Project Specification Base plate glass Grey antisolar glass 60cm * 60cm thickness 8mm Parts (unit) Silver paste (Ag:95%, other nature of glass 5%) line length 21mm live width 0.5mm

[table 2] Project Summary Method of measurement Utilize insertion loss method (the peristome size 110cm * 50cm) of electromagnetic wave shielding room peristome Measuring instrument Sender unit: synthetic frescan signal receiver: frequency spectrum analyser antenna: W rigid waveguide horn antenna Measuring distance ????60cm.??200cm Incidence angle ????0°,60° Plane of polarization Vertically, horizontal polarization

Figure 10 represents 4 dihedrals are made in wire antenna unit 5, i.e. the situation of criss-cross unit.In this case, center 5a becomes the low place of current potential, and the end of each limit 5b becomes the high place of current potential.Compare with Figure 10, under the situation of Fig. 2, owing to adopt the high potential place of wire antenna unit 5 and the triangular arrangement that the electronegative potential place is close, just can prevent the local located adjacent one another of high potential and mutual interference between generating unit.In addition, so owing to adopt leg-of-mutton arrangement can improve cell density.

Figure 12 represents the other variation of the wire antenna unit 5 of open-ended shape.Wherein be shown in the in-line unit in left side, total length is identical with electromagnetic 1/2 wavelength that will shield.

In addition, confirm by experiment, be arranged with the glass pane 1 of above-mentioned wire antenna unit 5, exist the part of no antenna element 5 also can fully adapt to (its purposes) even dispose the part of liner etc. at the docking location (gap between glass) of glass.According to this experimental result, can observe big minor change shielding centre frequency generation micro displacement because of the glass gap, but about 30mm with the interior regulation performance that can satisfy shielding.

This experiment is sent the electromagnetic wave of certain power by the antenna in the shielded enclosure with peristome (wide 51cm * high 111cm) shown in 21, the antenna outer by shielded enclosure receives this electromagnetic wave; Load onto the glass pane of the present invention 1 that constitutes by 2 above-mentioned tested bodies at peristome, the received electric field strength when the spacing in the gap between this glass pane 1 being changed with the frequency spectrum analyser measurement.

; though before said the electromagnetic field reflection equivalent area that consider wire antenna unit 5 or volume it was arranged on the glass pane 1 regularly; make electromagnetic wave attenuation with this wire antenna unit 5, but attenuation that can also and then consider needs is determined wire sky one unit 5 optimal spacing to each other.

Attenuation in order to ensure height preferably makes wire antenna unit 5 adjacent near-earths arrange as far as possible; On the contrary, if make on its glass that excessively is arranged in glass pane then can cause a visual problem (keep off) contiguously.

Figure 22, Figure 23 are the experimental provisions for the relation of the arrangement pitches of observing such wire antenna unit and attenuation.Copper rod is used as the wire antenna unit tests, the result just obtains dependency relation shown in Figure 24.

So, relation that adopt to consider attenuation decides the mutual arrangement pitches in wire antenna unit 5, decide the method for the mutual arrangement pitches in wire antenna unit according to the attenuation of necessity, just can guarantee big spacing each other at the wire antenna element as far as possible, thereby on glass, guarantee better sense of vision.

In addition, in above-mentioned experimental result, the material that makes wire antenna unit 5 is silver-colored paste sintering printed article, live width 0.5mm.The specific insulation that preferably makes wire antenna unit 5 is 5 * 10 -8Below (Ω m).

In order to ensure the attenuation of height, preferably reduce the loss resistance of wire antenna unit as far as possible.For this reason preferably by line width being done the wide resistance or adopt the material of good conductivity of realizing reducing the wastage.But the live width that increases the wire antenna unit can impair the optical transmission of the glass when having arranged this unit.As previously mentioned, when the live width that makes the wire antenna unit is the 0.5mm left and right sides, according to the described the present invention of claim 11, as long as specific insulation is at least 5 * 10 -8(Ω m) is following just to guarantee sufficient performance.

In addition, as the material of wire antenna unit, copper, silver, gold are only for the low material of resistance.But the price height of gold, and copper is because the oxidation resistance value can rise.As previously mentioned, adopt silver, it is very not high just to have made price, does not have the antenna element that the danger of resistance value rising takes place because of oxidation.

In addition, the glassy substances of sneaking into about 5% just can be integrated with glass, and make the life-span of wire antenna unit and glass roughly the same.

Fig. 7, Fig. 8 represent to replace the wire antenna unit 5 of open-ended shape and when adopting the situation of wire antenna unit of ring-type circuit shape, make the example of the ring-type circuit shape of Y shape.In addition, the variation of the wire antenna unit 4 of ring-type circuit shape shown in Figure 11.Can consider triangle, quadrangle, different shapes such as other polygonals, circle.

The wire antenna unit 4 of such ring-type circuit shape makes its girth (electrical length) identical with the electromagnetic wavelength that will shield.Say exactly, when wavelength be λ, when equivalent relative dielectric constant is ε, wire antenna unit 4 is that girth is about Ring.

Compare with the wire antenna unit 5 of above-mentioned open-ended shape, the wire antenna unit 4 of this ring-type circuit shape can use the thin line of line width; In addition, eliminate the short cell capacitance composition in λ/4 and obtained condition of resonance with the inductance of the ring that turns back than the wire antenna unit of open-ended shape.Bring up to 4 times though radiation resistance is low by the effect of the circuit that turns back.

Because the unit is short, so electric field strength low energy reduces the influence of the dielectric constant of glass.In addition, if increase the width of ring, then Zob (characteristic impedances of 2 parallel lines) increases, and just can obtain lowering the effect of the influence of glass.In addition, as increasing width, then equivalent radius increases, and just can realize wide frequency band by enough fine rules.

In Figure 13, the other variation as the wire antenna unit 5 of above-mentioned open-ended shape makes the each several part of this wire antenna 5 become ring-type circuit shape 5c.We can say, make the complex that the wire antenna unit of ring-type circuit shape is housed on the part of the wire antenna unit of open-ended shape.

The result who does like this uses many fine rules side by side, and reflective surface area is increased, and can not reduce light transmission again and reduces the high-frequency loss resistance value, and it is possible that broad in band and high decay are changed into.

, for example the frequency band of portable phone has 900MHz one band and 1, and 500MHz one is with these 2 kinds.Similarly, the frequency of PHS is 1.9GHz, and the situation of WLAN is that frequency is 2.45GHz.In order to carry out the electromagnetic shielding of these wave band, just must corresponding a plurality of frequency bands.

Figure 14 is the oblique view of embodiment of the electromagnetic shielding method of the correspondence of expression with so a plurality of frequency bands.Here the different wire antenna unit combination of length is got up and make them regularly arranged.In the present embodiment, the wire antenna unit 5 of the wire antenna unit 4 of ring-type circuit shape with the open-ended shape combined, and considered equivalent electric magnetic field reflective surface area (volume) separately and said composition is lined up regularly.And as shown in figure 15, Y shape thing is made in the wire antenna unit 5 of open-ended, the wire antenna unit 4 of ring-type circuit shape is made the unit of equilateral triangle.In addition, 2 heavy unit have been made in wire antenna unit 3, but also can make it 1 heavy.

Have, wire antenna unit 5 is contained in the wire antenna unit 4 and does not interconnect again.Do the interference that just can alleviate between the unit like this.Figure 16 represents the effectiveness of wire antenna unit 4,5 shown in Figure 15, and the longitudinal axis is an attenuation, and transverse axis is a frequency.(DDS is the situation that wire antenna unit 3 is become the unit of 2 weights, and SDS is the situation when becoming 1 weight unit).

Figure 17 represents the variation of composition of the wire antenna unit 5 of the wire antenna unit 4 of ring-type circuit shape and open-ended shape.A is the example of end bending among the figure.

In addition,, can also adopt following method as electromagnetic shielding method with a plurality of frequency band correspondences: as shown in figure 18, the situation that wire antenna unit 5 combinations with one another of the different open-ended shape of length are got up; Or as shown in figure 19, the situation that wire antenna unit 4 combinations with one another of the different ring-type circuit shape of length are got up.

In addition, the wire antenna unit combination example that is used for 3 frequency bands of the method as a plurality of frequency correspondences shown in Figure 20.

In addition, the foregoing description is narrated the glass pane of the window that is used for building, but the present invention also is applicable to the glass pane of the vehicles such as automobile, train and the glass pane of daily apparatus such as dividing plate, chest in addition.

Utilize possibility on the industry

As mentioned above, because glass pane of the present invention only can shield the electromagnetic wave with the corresponding frequency band of antenna element length, and can see through the electromagnetic wave beyond this, so can only select the electromagnetic wave band of necessary frequency to carry out electromagnetic shielding.

Have again, owing to maximum can shield about 40dB, and around antenna element, have reflector space, so even exist gap to a certain degree also can guarantee shielding properties; Because so the graph thinning that can accomplish antenna element is without detriment to daylighting and visuality.

Have, glass pane of the present invention need not to carry out the processing to the gap portion between the parts that it is housed again, or is used for the energising of conductive material of ground connection and processes.

Claims

Modification according to the 19th of treaty

1. (after the revisal) a kind of glass pane with capability of electromagnetic shielding, it is characterized in that: making the open-ended shape, make extend from the center its on one side the length (electrical length) of (5b) for 1/4 wavelength of the electric wave that will shield about the wire antenna unit (5) of (in the time of a shape is about 1/2 wavelength) as the electromagnetic shielding unit, consider the electromagnetic field reflection equivalent area (scattering aperture area) or the electromagnetic field reflection equivalent volume (scattering aperture volume) of this unit, and make the center (5a) of the end on each limit (5b) near adjacent wire antenna unit, this unit cell arrangement between glass surface or glass plate, by making radio wave scattering make radio wave attenuation with this wire antenna unit.

2. (deletion)

3. (after the revisal) a kind of glass pane with capability of electromagnetic shielding, it is characterized in that: ring-type circuit shape, the wire antenna unit (4) of the wavelength same degree of the electric wave that makes its girth (electrical length) and will shield is as the electromagnetic shielding unit, consider the electromagnetic field reflection equivalent area (scattering aperture area) of this unit or electromagnetic field reflection equivalent volume (scattering aperture volume) this unit cell arrangement between glass surface or glass plate, by making radio wave scattering make radio wave attenuation with this wire antenna unit.

4. according to the arbitrary described glass pane with capability of electromagnetic shielding of claim 1 to 3, the wire antenna unit is made of can shield a plurality of frequencies a plurality of kinds, make size, variform more than 2 kinds the wire antenna unit combination and line up.

5. the glass pane with capability of electromagnetic shielding according to claim 4, the wire antenna unit is made of can shield a plurality of frequencies a plurality of kinds, makes the antenna element (4) of the wire antenna unit (5) of open-ended shape and ring-type circuit shape combined.

6. the glass pane with capability of electromagnetic shielding according to claim 4, the wire antenna unit is made of can shield a plurality of frequencies a plurality of kinds, makes the wire antenna unit (5) of the different open-ended shape of length combined each other.

7. the glass pane with capability of electromagnetic shielding according to claim 4, the wire antenna unit is made of can shield a plurality of frequencies a plurality of kinds, makes the wire antenna unit (4) of the different ring-type circuit shape of length combined each other.

8. (deletion)

9. (after the revisal) a kind of glass pane with capability of electromagnetic shielding is characterized in that: the wire antenna unit (5) of open-ended shape, and the part of its wire antenna unit forms as ring-type circuit shape (5c); This wire antenna unit (5) as the electromagnetic shielding unit, consider the electromagnetic field reflection equivalent area (scattering aperture area) of this unit or electromagnetic field reflection equivalent volume (scattering aperture volume) this unit cell arrangement between glass surface or glass plate, by making radio wave scattering make radio wave attenuation with this wire antenna unit.

10. (deletion)

11. the arbitrary described glass pane with capability of electromagnetic shielding according to claim 1 to 10 makes the specific insulation of wire antenna unit be at least 5 * 10 -8Below (Ω m).

12. according to the arbitrary described glass pane with capability of electromagnetic shielding of claim 1 to 11, the wire antenna unit adopts good conductivity, durability, material that climate adaptability is good, and sneaks into a spot of glassy substances.

Claims (12)

1. glass pane with capability of electromagnetic shielding, it is characterized in that: with the wire antenna unit of the length of the electric wave phase resonance that will shield as the electromagnetic shielding unit, consider the ELECTROMAGNETIC REFLECTION equivalent area (scattering aperture area) of this unit or ELECTROMAGNETIC REFLECTION equivalent volume (scattering aperture volume) this unit cell arrangement between glass surface or glass plate, by making radio wave scattering make radio wave attenuation with this wire antenna unit.
2. the glass pane with capability of electromagnetic shielding according to claim 1, wire antenna unit (5) are made the open-ended shape, make extend from the center its on one side the length (electrical length) of (5b) be 1/4 wavelength (in the time of a shape is 1/2 wavelength) of the electric wave that will shield.
3. the glass pane with capability of electromagnetic shielding according to claim 1, wire antenna unit (4) are ring-type circuit shape, make its girth (electrical length) identical with the wavelength of the electric wave that will shield.
4. according to the arbitrary described glass pane with capability of electromagnetic shielding of claim 1 to 3, the wire antenna unit is made of can shield a plurality of frequencies a plurality of kinds, make size, variform more than 2 kinds the wire antenna unit combination and line up.
5. the glass pane with capability of electromagnetic shielding according to claim 4, the wire antenna unit is made of can shield a plurality of frequencies a plurality of kinds, makes the antenna element (4) of the wire antenna unit (5) of open-ended shape and ring-type circuit shape combined.
6. the glass pane with capability of electromagnetic shielding according to claim 4, the wire antenna unit is made of can shield a plurality of frequencies a plurality of kinds, makes the wire antenna unit (5) of the different open-ended shape of length combined each other.
7. the glass pane with capability of electromagnetic shielding according to claim 4, the wire antenna unit is made of can shield a plurality of frequencies a plurality of kinds, makes the wire antenna unit (4) of the different ring-type circuit shape of length combined each other.
8. the glass pane with capability of electromagnetic shielding according to claim 2, the wire antenna unit (5) of open-ended shape makes the end on each limit (5b) line up near the center (5a) of adjacent wire antenna unit.
9. the glass pane with capability of electromagnetic shielding according to claim 2, the wire antenna unit (5) of open-ended shape, its wire antenna cell mesh are ring-type circuit shape (5c).
10. according to the arbitrary described glass pane with capability of electromagnetic shielding of claim 1 to 9, the mutual arrangement pitches in wire antenna unit considers that the relation of attenuation determines.
11. the arbitrary described glass pane with capability of electromagnetic shielding according to claim 1 to 10 makes the specific insulation of wire antenna unit be at least 5 * 10 -8Below (Ω m).
12. according to the arbitrary described glass pane with capability of electromagnetic shielding of claim 1 to 11, the wire antenna unit adopts good conductivity, durability, material that climate adaptability is good, and sneaks into a spot of glassy substances.
CN 97191176 1996-08-30 1997-08-29 Windowpane having electromagnetic shielding ability CN1200231A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
JP229557/96 1996-08-30
JP22955796 1996-08-30
JP145226/97 1997-06-03
JP9145226A JPH10335877A (en) 1997-06-03 1997-06-03 Electromagnetic shielding method having frequency selectivity
JP233411/97 1997-08-29
JP09233411A JP3079364B2 (en) 1996-08-30 1997-08-29 Window glass with electromagnetic shielding performance

Publications (1)

Publication Number Publication Date
CN1200231A true CN1200231A (en) 1998-11-25

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN 97191176 CN1200231A (en) 1996-08-30 1997-08-29 Windowpane having electromagnetic shielding ability

Country Status (2)

Country Link
CN (1) CN1200231A (en)
WO (1) WO1998009490A1 (en)

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Publication number Publication date
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WO1998009490A1 (en) 1998-03-05

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