CN101188324A - Transparent antenna - Google Patents
Transparent antenna Download PDFInfo
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- CN101188324A CN101188324A CN 200710164301 CN200710164301A CN101188324A CN 101188324 A CN101188324 A CN 101188324A CN 200710164301 CN200710164301 CN 200710164301 CN 200710164301 A CN200710164301 A CN 200710164301A CN 101188324 A CN101188324 A CN 101188324A
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- nesa coating
- equal
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/40—Radiating elements coated with or embedded in protective material
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/1271—Supports; Mounting means for mounting on windscreens
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
- H01Q9/04—Resonant antennas
- H01Q9/30—Resonant antennas with feed to end of elongated active element, e.g. unipole
- H01Q9/40—Element having extended radiating surface
Abstract
A transparent antenna includes a radiating element for radiating an electromagnetic wave in a frequency band of 100 MHz to 20 GHz. A transparent conductive film including either an ITO thin film or an FTO thin film, or both, transmits light in a visible light wavelength range of 350 nm to 780 nm. The transparent conductive film has a film thickness of 100 nm or more, a transmittance of 40% or more in the visible light wavelength range, and a sheet resistivity of 20 ohms/square or less.
Description
Technical field
The present invention relates to optically transparent antenna.
The present patent application advocates to specially permit out in the Japan that on October 20th, 2006 proposed the priority of hope 2006-286244 number, and has quoted its content in this manual.
Background technology
The present invention relates to optically transparent antenna.Use this antenna, can be under situation about not affecting the appearance, antenna is arranged on the window of the surface of wireless device and wireless terminal or display.Transparent antenna of the present invention not only can be arranged on and be provided with on the restricted micro radio equipment in position, and, by antenna being arranged on the surface of equipment, the electronic device that can make device interior is away from antenna, can reduce the influence of electronic device, so the design of antenna is more prone to antenna.
As the conventional art relevant with the present invention, for example known have following document 1～7 a disclosed technology.Up to the present, as transparent antenna, proposed the antenna of variety of way, for example can list metal is made cancellate antenna (reference literature 1), used the antenna (reference literature 2) of extremely thin metal and used antenna (reference literature 3～7) of transparency electrode etc.
Here, as the transparency electrode of disclosed transparent antenna in document 3～7, used indium oxide (ITO) film of the tin that mixed.
[document 1] M.S.Wu and K.Ito. " Meshed microstrip antennasconstructed on a transparent substrate, " IEICE Trans., vol.E-74, no.5, pp.1277-1282,1991.
No. 3682480 communique of [document 2] Japan special permission
[document 3] R.N.Simons and R.Q.Lee, " Feasibility syudy of opticallytransparent microstrip patch antenna, " IEEE AP-S Int.Symp., pp.2100-2103,1997.
[document 4] M.Outaleb, J.Pinel, M.Drissi, and O.Bonnaud, " Microwave planar antenna with rf-sputtered indium tin oxide films, " Microwave and Opt.Technol.Lett., vol.24, no.1, pp.3-7,2000.
[document 5] C.Mias, C.Tsakonas, N.Prountzos, D.C.Koutsogeorgis, S.C.Liew, C.Oswald, R.Ranson, W.M.Cranton, and C.B.Thomas, " Optically transparent microstrip antennas, " IEE Colloquium onAntennas for Automotives, pp.8/1-8/6,2000.
[document 6] K.Oshime, N.Kidera, K.Niwano, K.Ikawa, R.Sonoda, and S.Kawasaki, " Use of a transparent conductive thin-film on a glasssubstrate in active integrated antenna arrays with double strongcoupling; " IEEE MTT-S Int.Microwave Symp.Dig., pp.1569-1572,2002.
[document 7] C-F.Huang and L.Chen, " Realization of aprinted-on-display antenna for mobile terminals, " Elect.Lett., vol.38, no.20, PP.1162-1163,2002.
But, exist following problem in the technology in the past.
The document 1 disclosed antenna that uses the clathrate metal also has to keep the part of blocking visible light.In addition, under the situation of the disclosed antenna that has used metal film of document 2, even make the metal film attenuation, visible light transmittance is also very low.Therefore, from the outward appearance aspect, any one antenna all is difficult to be arranged on the surface of micro radio equipment.
On the other hand, though ito thin film is transparent, the transmissive visible light, because the resistivity height, so have bigger resistance value.Document 3～7 disclosed antennas, because it is the resistance of radiant element is big,, impracticable so it is low to gain.In addition, in document 3～7, the resistance value that does not spell out in the transparent antenna causes gaining and the reduction of radiation efficiency and the relation between transparency and gain and the radiation efficiency.
Summary of the invention
The present invention proposes in view of the above problems, and purpose provides a kind of transparent antenna with sufficient transparency and sufficient radiation characteristic.
The invention provides a kind of transparent antenna, has the light of the visible wavelength region that can see through 350nm～780nm and with the radiant element of 100MHz～20GHz frequency range radiated electromagnetic wave, wherein, above-mentioned radiant element is by a side of ito thin film and FTO film or the nesa coating that both sides constitute, the thickness of this nesa coating is more than or equal to 100nm, transmissivity under above-mentioned visible wavelength region is more than or equal to 40%, and film resistor is smaller or equal to 20 Ω/.
In transparent antenna of the present invention, it is desirable to, above-mentioned nesa coating is formed on the transparent dielectric base plate.
In transparent antenna of the present invention, it is desirable to, the thickness of above-mentioned nesa coating is more than or equal to 100nm, and the transmissivity under above-mentioned visible wavelength region is more than or equal to 60%, and film resistor is smaller or equal to 20 Ω/.
In transparent antenna of the present invention, it is desirable to, the thickness of above-mentioned nesa coating is in more than or equal to 100nm and the scope smaller or equal to 1 μ m.
In transparent antenna of the present invention, it is desirable to, above-mentioned nesa coating is made of the FTO film.
In transparent antenna of the present invention, it is desirable to, on above-mentioned transparent dielectric substrate, formed under the state of above-mentioned nesa coating, the transmissivity under the visible wavelength region of 350nm～780nm is more than or equal to 30%.
In transparent antenna of the present invention, it is desirable to, on above-mentioned transparent dielectric substrate, formed under the state of above-mentioned nesa coating, the transmissivity under the visible wavelength region of 350nm～780nm is more than or equal to 50%.
In transparent antenna of the present invention, also can be that above-mentioned nesa coating is formed on the opaque dielectric base plate.
In transparent antenna of the present invention, it is desirable to, under 1GHz～12GHz, to compare with the antenna that the metallic film that uses same size is made, gain descends smaller or equal to 6dB, and radiation efficiency is more than or equal to 20%.
In transparent antenna of the present invention, it is desirable to, under 1GHz～12GHz, the gain rate of descent that causes by the film resistor of nesa coating smaller or equal to 0.5dB/ (Ω/), the rate of descent of radiation efficiency smaller or equal to 5%/(Ω/).
Transparent antenna of the present invention is one pole type antenna preferably, and wherein, above-mentioned nesa coating forms quadrangle, and its bottom is electrically connected following W with circuit
1, top W
2, high L satisfies 0.1mm≤W
1≤ 15mm, 0.1mm≤W
2The relation of≤15mm, 2mm≤L≤50mm.
Transparent antenna of the present invention is dipolar antenna preferably, wherein, above-mentioned nesa coating is made of 2 main parts of 2 parallel ribbon base portions and and quadrangle form that extend to foreign side crooked from an end of this base portion, the other end of each base portion is electrically connected with circuit, the length W on the limit of the base portion side of main part
1, and W
1The length W on relative limit
2, the length L of main part, the length W of base portion
3, base portion at interval G satisfy 0.1mm≤W
1≤ 15mm, 0.1mm≤W
2≤ 15mm, 0≤W
3The relation of≤10mm, 2mm≤L≤50mm, 0.05mm≤G≤5mm.
In transparent antenna of the present invention, it is desirable to, above-mentioned nesa coating is formed on the side or both sides of interior outside of the surface of the wireless device with dielectric basket or display.
In transparent antenna of the present invention, it is desirable to, have following structure: above-mentioned nesa coating is formed on the side or both sides of interior outside of the surface of the wireless device with dielectric basket or display, and the stacked dielectric base plate that this nesa coating is clipped in the middle.
Transparent antenna of the present invention has the transparency in the visible region, and the electromagnetic wave of radiation-curable 100MHz～20GHz frequency range.The ito thin film low by the use film resistor, that the transparency is high, and the antenna pattern of designing optimal can provide the antenna that has abundant transparency and have abundant radiation characteristic.
In addition, if use the FTO film, then can avoid using the rare metal indium, thereby can reduce cost.
Transparent antenna of the present invention because transparent and unshowy, so can be arranged on the glass pane, can be used as domestic aerial and car antenna uses.And, can be installed on the surface and display of wireless terminal of miniaturization year by year, not only can guarantee the position that is provided with of antenna, and can make the design of antenna become easy.
According to the present invention, can provide following such antenna: both can guarantee transmissivity more than or equal to 70%, antenna gain is descended smaller or equal to 1dB, radiation efficiency more than or equal to 80%.
Description of drawings
Fig. 1 is illustrated in the ito thin film that uses in the transparent antenna of the present invention and the FTO film curve chart in transmissivity under the wavelength 550nm and the relation between the film resistor.
Fig. 2 is the curve chart of wavelength dependency that is illustrated in the transmissivity of the ito thin film that uses in the transparent antenna of the present invention and FTO film.
Fig. 3 is the skeleton diagram of expression as the shape of the nesa coating of the one pole type antenna of an example of transparent antenna of the present invention.
Fig. 4 is the curve chart that is illustrated in the frequency characteristic of the VSWR when having changed film resistor in the antenna of Fig. 3.
Fig. 5 is the curve chart that is illustrated in the frequency characteristic of the maximum gain when having changed film resistor in the antenna of Fig. 3.
Fig. 6 is the curve chart that is illustrated in the frequency characteristic of the radiation efficiency when having changed film resistor in the antenna of Fig. 3.
Fig. 7 is illustrated in the antenna of Fig. 3, the E of the XY face under 5.6GHz
θThe curve chart of radiating pattern.
Fig. 8 is the E of the same XZ face under 5.6GHz of expression
θThe curve chart of radiating pattern.
Fig. 9 is the E of the same YZ face under 5.6GHz of expression
θThe curve chart of radiating pattern.
Figure 10 is the vertical view that is illustrated in the structure of the antenna of making among the embodiment 1.
Figure 11 be the expression embodiment 1 transparent antenna under the state that has formed nesa coating on the glass substrate, the curve chart of the transmissivity under wavelength 550nm and the relation of film resistor.
Figure 12 is the curve chart that is illustrated in the frequency characteristic of the VSWR when having changed film resistor in the antenna of embodiment 1.
Figure 13 is illustrated in the antenna of embodiment 1, the E of the XY face under 2.4GHz
θThe curve chart of radiating pattern.
Figure 14 is the E of the same XZ face under 2.4GHz of expression
θThe curve chart of radiating pattern.
Figure 15 is the E of the same YZ face under 2.4GHz of expression
θThe curve chart of radiating pattern.
Figure 16 is the curve chart of the antenna of expression embodiment 1 in maximum gain under 2.4GHz and the 5.0GHz and the relation between the film resistor.
Figure 17 is the curve chart of the antenna of expression embodiment 1 in radiation efficiency under 2.4GHz and the 5.0GHz and the relation between the film resistor.
Figure 18 is illustrated among the embodiment 2 antenna made under the state that has formed nesa coating on the glass substrate, the curve chart of the transmissivity under wavelength 550nm and the relation of film resistor.
Figure 19 is illustrated in the antenna of embodiment 2, the E of the XY face under 2.4GHz
θThe curve chart of radiating pattern.
Figure 20 is the E of the same XZ face under 2.4GHz of expression
θThe curve chart of radiating pattern.
Figure 21 is the E of the same YZ face under 2.4GHz of expression
θThe curve chart of radiating pattern.
Figure 22 is the curve chart of the antenna of expression embodiment 2 in maximum gain under 2.4GHz and the 5.0GHz and the relation between the film resistor.
Figure 23 is the curve chart of the antenna of expression embodiment 2 in radiation efficiency under 2.4GHz and the 5.0GHz and the relation between the film resistor.
Figure 24 is the vertical view that is illustrated in the shape of the nesa coating of the dipolar antenna of making among the embodiment 3.
Figure 25 is the stereogram that the major part of the wireless device of the dipolar antenna of making in embodiment 4 has been disposed in expression.
Figure 26 is the stereogram that the major part of the wireless device of the dipolar antenna of making in embodiment 5 has been disposed in expression.
Figure 27 is the figure that the position relation of the reference axis of using in the present invention is described.
Embodiment
Below, with reference to accompanying drawing, embodiments of the present invention are described.
Transparent antenna of the present invention is to have the light of the visible wavelength region that can see through 350nm～780nm and with the transparent antenna of the radiant element of 100MHz～20GHz frequency range radiated electromagnetic wave, above-mentioned radiant element is by a side of ito thin film and FTO film or the nesa coating that both sides constitute, the thickness of this nesa coating is more than or equal to 100nm, transmissivity under above-mentioned visible wavelength region is more than or equal to 40%, and film resistor is smaller or equal to 20 Ω/.If the thickness of this nesa coating less than 100nm, then can not obtain sufficient radiation characteristic, be difficult to use as antenna.In addition, if the transmissivity under the visible region less than 40%, then from appearance, is difficult to be arranged on the surface of micro radio equipment.In addition, if film resistor surpasses 20 Ω/, then gain reduces, and can not use as antenna.In addition, the thickness of nesa coating is smaller or equal to 1 μ m.If thickness is thick, then film resistor descends, and transmissivity descends.Film resistor and thickness roughly are inversely proportional to.
As above-mentioned nesa coating, wish to use film resistor in the scope of 1 Ω/～20 Ω/ and the transmissivity under the wavelength 550nm more than or equal to 70% ito thin film.
Tin oxide (FTO) film of in addition, also can use cost low doped with fluorine.In this case, as the FTO film, wish to use film resistor in the scope of 1 Ω/～5 Ω/ and the transmissivity under the wavelength 550nm more than or equal to 50% film, perhaps film resistor in the scope of 5 Ω/～20 Ω/ and the transmissivity under the wavelength 550nm more than or equal to 80% film.
Fig. 1 is illustrated in ito thin film and the film resistor of FTO film under wavelength 550nm and the relation of using in the nesa coating that becomes radiant element of transmissivity.
Ito thin film is the film of film resistor more than or equal to 0.6 Ω/, if film resistor more than or equal to 0.6 Ω/, then transmissivity is more than or equal to 70%.In addition, the FTO film is the film of film resistor more than or equal to 1 Ω/, if film resistor more than or equal to 1 Ω/, then transmissivity is more than or equal to 50%.
In addition, Fig. 2 is that the expression film resistor is the curve chart of wavelength dependency of transmissivity of the FTO film of the ito thin film of 1.6 Ω/ and 15.5 Ω/.The drastic change of transmissivity is because the interference of thickness.
Use these nesa coatings, made one pole type antenna shown in Figure 3, it is used as basic research.Consider the resistance of radiating element of antenna, and use square amount (moment) method (with reference to R.F.Harrington, Field computation by moment methods, IEEE PRESS, 1993.) resolve.Here, under the situation that film resistor equates, VSWR characteristic, maximum gain, radiation efficiency and radiating pattern are got identical value, and irrelevant with the kind of film.
One pole type antenna 1 shown in Figure 3 has the nesa coating 2 that forms trapezoidal shape.Symbol 3 among the figure is ground.In this one pole type antenna 1, wish the following W of nesa coating 2
1, top W
2, high L satisfies 0.1mm≤W
1≤ 15mm, 0.1mm≤W
2≤ 15mm, 2mm≤L≤50mm.
Fig. 4 is illustrated in to have used W
1=3mm, W
2The curve chart of the frequency characteristic of the voltage standing wave ratio (VSWR) when having changed the film resistor of nesa coating 2 in the antenna 1 of the nesa coating 2 of=9mm, L=21mm.Wherein, the characteristic impedance of transmission line is 50 Ω.As shown in the figure, during smaller or equal to 10 Ω/, the VSWR characteristic is approaching with the VSWR characteristic of the antenna of the same size that uses common metallic film (for example Copper Foil) to make, basic no change at film resistor.
Fig. 5 is the curve chart that is illustrated in the frequency characteristic of the maximum gain (having used the gain of the antenna of nesa coating in the greatest irradiation direction) when having changed film resistor.Wherein, maximum gain represents with relative value, this relative value be with the antenna that used metal film in the gain of greatest irradiation direction as benchmark.As shown in the figure, can find out that the decline of the gain of antenna has intrinsic frequency characteristic according to different separately film resistors.For example, if the use film resistor is the nesa coating of 10 Ω/, then under 2GHz, gain drops to 4.5dB, and under 5GHz, reduces to 1.4dB.Here, as shown in Figure 1, using under the situation of ito thin film as nesa coating, the transmissivity when film resistor is 10 Ω/ is 95%, and under the situation of having used the FTO film, the transmissivity when film resistor is 10 Ω/ is 89%.In addition, if the use film resistor is the nesa coating of 1 Ω/, then under 2GHz, it only is 0.9dB that gain descends, and under 5GHz, further is reduced to 0.2dB.As shown in Figure 1, under the situation of having used ito thin film, the transmissivity when film resistor is 1 Ω/ is 74%, and under the situation of having used the FTO film, the transmissivity when film resistor is 1 Ω/ is 50%.
Fig. 6 is the curve chart of the frequency characteristic of the radiation efficiency of expression when having changed film resistor.Radiation efficiency is also same with gain, has intrinsic frequency characteristic according to separately film resistor, and can obtain higher radiation efficiency near 5GHz.For example, if the use film resistor is the nesa coating of 10 Ω/, then the radiation efficiency under the 2GHz is 34%, but the radiation efficiency under the 5GHz rises to 72%.In addition, if the use film resistor is the nesa coating of 1 Ω/, then the radiation efficiency under the 2GHz is 80%, and the radiation efficiency under the 5GHz rises to 95%.
Fig. 7～Fig. 9 specifically represents the radiating pattern under the 5.6GHz.Here, the length direction along nesa coating 2 is made as the z axle,, the direction with y axle and z axle quadrature is made as the x axle being made as the y axle with z axle quadrature and with the surperficial parallel direction of nesa coating 2.In addition, as shown in figure 27, the line segment OP that links initial point O and measuring point P is made as θ with the formed angle of z axle.Linking measuring point P is projected on the XY face and the line segment of the some P ' that obtains and initial point O is made as φ with x axle angulation.Below, also be same about Figure 13～15, Figure 19～21.Fig. 7 is the E of the XY face under the expression 5.6GHz
θThe curve chart of radiating pattern.Fig. 8 is the E of the XZ face under the expression 5.6GHz
θThe curve chart of radiating pattern.Fig. 9 is the E of the YZ face under the expression 5.6GHz
θThe curve chart of radiating pattern.
The present invention the is clear and definite film resistor of the nesa coating in the specific antenna and the relation of antenna performance.Utilize this relation, can carry out not only can guaranteeing the high grade of transparency, but also can have the optimal design of the antenna of high-gain and radiation efficiency.
[embodiment 1]
Make antenna 4 shown in Figure 10, and measured antenna performance.This antenna 4 forms nesa coating 6 and constitutes on transparent glass substrate 5.In embodiment 1, the producing transparent conductive film has used ito thin film.The thickness of glass substrate 5 is 1.1mm, and relative dielectric constant is 4.8.In addition, the ground plate 7 that uses in mensuration is copper plates, and size is 300mm * 300mm.In addition, conductive membrane 6 has the identical size of the nesa coating used with basic research 2.
Figure 11 is the curve chart of relation of the film resistor of transmissivity under the expression wavelength 550nm, the antenna 4 under the state that has formed ito thin film on the glass substrate 5 and ito thin film.
Figure 12 is the curve chart of VSWR characteristic that is illustrated in the antenna 4 of the embodiment 1 when having changed film resistor.As shown in the figure, if film resistor smaller or equal to 10 Ω/, then the VSWR characteristic of antenna 4 is compared with the VSWR characteristic of copper antenna, almost no change.
Figure 13～Figure 15 represents the radiating pattern of antenna 4 under 2.4GHz of embodiment 1.Figure 13 is the E of the XY face under the expression 2.4GHz
θThe curve chart of radiating pattern.Figure 14 is the E of the XZ face under the expression 2.4GHz
θThe curve chart of radiating pattern.Figure 15 is the E of the YZ face under the expression 2.4GHz
θThe curve chart of radiating pattern.
In addition, Figure 16 represents the maximum gain of antenna 4 under 2.4GHz and 5.0GHz practical measurement and embodiment 1 Theoretical Calculation.Wherein, maximum gain represents with relative value, and this relative value is as benchmark with the gain of antenna on the greatest irradiation direction of having used metal film.In addition, by the gain rate of descent that film resistor causes, under 2.4GHz, be about 0.2dB/ and (Ω/), under 5.6GHz, be about 0.12dB/ (Ω/).
Measured the radiation efficiency of antenna 4 under 2.4GHz and 5.0GHz too, and together be illustrated among Figure 17 with calculated value.The rate of descent of the radiation efficiency that is caused by film resistor is about 2.7%/(Ω/), be about 1.7% under 5.6GHz/(Ω/) under 2.4GHz.
[embodiment 2]
In embodiment 2, used the FTO film as nesa coating, made antenna 4 according to the size identical, and measured antenna performance with embodiment 1.Figure 18 represents the relation of the film resistor of transmissivity under the wavelength 550nm, the antenna 4 under the state that has formed the FTO film on the glass substrate 5 and FTO film.
Figure 19～Figure 21 represents the radiating pattern of antenna 4 under 2.4GHz of embodiment 2.Figure 19 is the E of the XY face under the expression 2.4GHz
θThe curve chart of radiating pattern.Figure 20 is the E of the XZ face under the expression 2.4GHz
θThe curve chart of radiating pattern.Figure 21 is the E of the YZ face under the expression 2.4GHz
θThe curve chart of radiating pattern.
In addition, measured the maximum gain of antenna 4 under 2.4GHz and 5.0GHz of embodiment 2, and together be illustrated among Figure 22 with calculated value.Wherein, maximum gain represents with relative value, and this relative value is as benchmark with the gain of antenna on the greatest irradiation direction of having used metal film.
In addition, measured the antenna radiation efficiency of antenna 4 under 2.4GHz and 5.0GHz of embodiment 2, and together be illustrated among Figure 23 with calculated value.
[embodiment 3]
As nesa coating, use ito thin film and FTO film, made dipolar antenna 8 as shown in figure 24, and measured.This dipolar antenna 8 has nesa coating 9A, 9B, this nesa coating 9A, 9B are made of 2 main parts of 2 parallel ribbon base portions and and quadrangle form that extend to foreign side crooked from an end of this base portion, and the other end of each base portion is electrically connected with circuit.The length W on the limit of the base portion side of main part
1, and W
1The length W on relative limit
2, the length L of main part, the length W of base portion
3, base portion at interval G satisfy 0.1mm≤W
1≤ 15mm, 0.1mm≤W
2≤ 15mm, 0≤W
3The relation of≤10mm, 2mm≤L≤50mm, 0.05mm≤G≤5mm.
In this dipolar antenna 8, establish L=21, W
1=3mm, W
2=9mm, W
3=6mm, G=1mm have formed figure on the glass substrate identical with embodiment 1.Similarly this antenna has been carried out the mensuration of transmissivity and radiation characteristic with embodiment 1, embodiment 2, and obtained the result roughly the same with embodiment 1 and embodiment 2.
In addition, change the size of antenna, make the length W on limit of the base portion side of its main part
1, W
2, the length L of main part, the length W of base portion
3, base portion at interval G satisfy 0.1mm≤W
1≤ 15mm, 0.1mm≤W
2≤ 15mm, 0≤W
3The relation of≤10mm, 2mm≤L≤50mm, 0.05mm≤G≤5mm.In this case, also obtained the gain decline and the radiation efficiency that cause by film resistor with embodiment 1 and embodiment 2 equal extent.If removing the gain that is caused by film resistor, radiating pattern descends, then roughly the same with the copper antenna.
[embodiment 4]
The antenna 8 of embodiment 3, such as shown in figure 25, be formed on the surface of wireless device with dielectric basket 10.In addition, the upper face of wireless device adopts insulating material.
In this case,, and compare with the situation of embodiment 2 independent settings, have only the VSWR characteristic to produce small variations as embodiment 1 though the radiation characteristic of antenna 8 is subjected to the influence of dielectric constant of the dielectric basket 10 of wireless device upper surface.This antenna especially can be arranged in the display portion of wireless device, and, can also be arranged on the inner face of the glass of display or transparent plastic.
[embodiment 5]
The antenna 8 of embodiment 3, such as shown in figure 26, be formed on the surface of the dielectric basket 10 of wireless device.The upper face of wireless device adopts insulating material, and antenna 8 is formed on such transparent dielectric substrate such as glass and plastics, and constituted with the mode that nesa coating 9A, 9B are clipped in the middle stacked the structure of dielectric base plate 11.
In this case,, and compare with the situation of embodiment 2 independent settings, have only the VSWR characteristic to produce small variations as embodiment 1 though the radiation characteristic of antenna 8 is subjected to the influence of the dielectric basket 10 of wireless device upper surface.And in this case, the dielectric base plate 11 that covers from upper surface also has the effect of protecting antenna.
More than, preferred embodiments of the present invention have been disclosed for illustrative, but the invention is not restricted to these embodiment, in the scope that does not exceed aim of the present invention, can carry out structure additional, omit, displacement and other change.The present invention is not subjected to the qualification of above-mentioned explanation, and limited by appended claims.
Claims (14)
1. transparent antenna has the light of the visible wavelength region that can see through 350nm～780nm and with the radiant element of 100MHz～20GHz frequency range radiated electromagnetic wave, wherein,
Above-mentioned radiant element is by a side of ito thin film and FTO film or the nesa coating that both sides constitute, the thickness of this nesa coating is more than or equal to 100nm, transmissivity under above-mentioned visible wavelength region is more than or equal to 40%, and film resistor is smaller or equal to 20 Ω/.
2. transparent antenna according to claim 1, wherein, above-mentioned nesa coating is formed on the transparent dielectric substrate.
3. transparent antenna according to claim 1, wherein, the thickness of above-mentioned nesa coating is more than or equal to 100nm, and the transmissivity under above-mentioned visible wavelength region is more than or equal to 60%, and film resistor is smaller or equal to 20 Ω/.
4. transparent antenna according to claim 1, wherein, the thickness of above-mentioned nesa coating is in more than or equal to 100nm and the scope smaller or equal to 1 μ m.
5. transparent antenna according to claim 1, wherein, above-mentioned nesa coating is made of the FTO film.
6. transparent antenna according to claim 2 wherein, has formed under the state of above-mentioned nesa coating on above-mentioned transparent dielectric substrate, and the transmissivity under the visible wavelength region of 350nm～780nm is more than or equal to 30%.
7. transparent antenna according to claim 2 wherein, has formed under the state of above-mentioned nesa coating on above-mentioned transparent dielectric substrate, and the transmissivity under the visible wavelength region of 350nm～780nm is more than or equal to 50%.
8. transparent antenna according to claim 1, wherein, above-mentioned nesa coating is formed on the opaque dielectric base plate.
9. transparent antenna according to claim 1 wherein, under 1GHz～12GHz, is compared with the antenna that the metallic film that uses same size is made, and gain descends smaller or equal to 6dB, and radiation efficiency is more than or equal to 20%.
10. transparent antenna according to claim 1, wherein, under 1GHz～12GHz, the gain rate of descent that causes by the film resistor of nesa coating smaller or equal to 0.5dB/ (Ω/), the rate of descent of radiation efficiency smaller or equal to 5%/(Ω/).
11. transparent antenna according to claim 1, wherein, this transparent antenna is an one pole type antenna, and above-mentioned nesa coating forms quadrangle, and its bottom is electrically connected with circuit, and, following W
1, top W
2, high L satisfies 0.1mm≤W
1≤ 15mm, 0.1mm≤W
2The relation of≤15mm, 2mm≤L≤50mm.
12. transparent antenna according to claim 1, wherein, this transparent antenna is a dipolar antenna, above-mentioned nesa coating is made of 2 main parts of 2 parallel ribbon base portions and and quadrangle form that extend to foreign side crooked from an end of this base portion, the other end of each base portion is electrically connected with circuit, and, the length W on the limit of the base portion side of main part
1, and W
1The length W on relative limit
2, the length L of main part, the length W of base portion
3, base portion at interval G satisfy 0.1mm≤W
1≤ 15mm, 0.1mm≤W
2≤ 15mm, 0≤W
3The relation of≤10mm, 2mm≤L≤50mm, 0.05mm≤G≤5mm.
13. transparent antenna according to claim 1, wherein, above-mentioned nesa coating is formed on the side or both sides of interior outside of the surface of the wireless device with dielectric basket or display.
14. transparent antenna according to claim 1, wherein, have following structure: above-mentioned nesa coating is formed on the side or both sides of interior outside of the surface of the wireless device with dielectric basket or display, and the stacked dielectric base plate that this nesa coating is clipped in the middle.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
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| JP2006286244 | 2006-10-20 | ||
| JP2006286244 | 2006-10-20 |
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| CN101188324A true CN101188324A (en) | 2008-05-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 200710164301 Pending CN101188324A (en) | 2006-10-20 | 2007-10-09 | Transparent antenna |
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| Country | Link |
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| JP (1) | JP2009533888A (en) |
| CN (1) | CN101188324A (en) |
| WO (1) | WO2008047953A1 (en) |
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| JPS63198401A (en) * | 1987-02-13 | 1988-08-17 | Toppan Printing Co Ltd | Transparent antenna |
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| JP2006259243A (en) * | 2005-03-17 | 2006-09-28 | Seiko Epson Corp | Electrophoresis display device and its manufacturing method, and electronic equipment |
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- 2007-10-09 CN CN 200710164301 patent/CN101188324A/en active Pending
- 2007-10-22 WO PCT/JP2007/070965 patent/WO2008047953A1/en active Application Filing
- 2007-10-22 JP JP2008548894A patent/JP2009533888A/en active Pending
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Also Published As
| Publication number | Publication date |
|---|---|
| JP2009533888A (en) | 2009-09-17 |
| WO2008047953A1 (en) | 2008-04-24 |
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Application publication date: 20080528 |