CN101765777B - Electromagnetic wave measuring apparatus - Google Patents
Electromagnetic wave measuring apparatus Download PDFInfo
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- CN101765777B CN101765777B CN2008801005202A CN200880100520A CN101765777B CN 101765777 B CN101765777 B CN 101765777B CN 2008801005202 A CN2008801005202 A CN 2008801005202A CN 200880100520 A CN200880100520 A CN 200880100520A CN 101765777 B CN101765777 B CN 101765777B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/08—Measuring electromagnetic field characteristics
- G01R29/0807—Measuring electromagnetic field characteristics characterised by the application
- G01R29/0814—Field measurements related to measuring influence on or from apparatus, components or humans, e.g. in ESD, EMI, EMC, EMP testing, measuring radiation leakage; detecting presence of micro- or radiowave emitters; dosimetry; testing shielding; measurements related to lightning
- G01R29/0821—Field measurements related to measuring influence on or from apparatus, components or humans, e.g. in ESD, EMI, EMC, EMP testing, measuring radiation leakage; detecting presence of micro- or radiowave emitters; dosimetry; testing shielding; measurements related to lightning rooms and test sites therefor, e.g. anechoic chambers, open field sites or TEM cells
Abstract
A radio anechoic box (1) is formed by arranging a radio wave absorber (3) inside a metallic case (2). An object (5) to be measured and a measuring antenna (6) are arranged apart from each other along an axial direction inside the box (1). The object (5) and the antenna (6) are placed offset from the center (O) of a cross section of the radio anechoic box (1) based on a wavelength lambda of electromagnetic waves in a frequency band where the absorber (3) exhibits lower absorption characteristics. Thus, a plurality of reflection waves traveling from the object (5) to the measuring antenna (6) can be interfered and canceled to reduce influence of the reflection waves.
Description
Technical field
The present invention relates to a kind of electromagnetic wave measuring apparatus when being used in mensuration for example by the electromagnetic wave of institute's radiation such as mobile phone.
Background technology
Generally, with regard to electromagnetic wave measuring apparatus, known have determinands such as mobile phone are configured in the small-sized electric wave silencer box, be arranged on (for example with reference to the patent documentations 1,2) such as radiation efficiencies of the antenna of this determinand in order to mensuration.Again, at patent documentation 1, disclosing has for small-sized and cheap mensuration space is provided, and is provided with at the employed electric wave absorbing sheet of special frequency band in electric wave silencer box inside.At this moment, the electric wave absorbing sheet has the electric wave absorption characteristic at electromagnetic mensuration frequency band.Therefore, its formation is to use different according to the service band of mobile phone and different electric wave absorbing sheets.That is, for example use the electric wave absorbing sheet that has the electric wave absorption characteristic at 700～900MHz for the 800MHz band; Use the electric wave absorbing sheet that has the electric wave absorption characteristic at 1.4～1.65GHz for the 1.5GHz band; Use the electric wave absorbing sheet that has the electric wave absorption characteristic at 1.75～2.0GHz for the 1.9GHz band; Use the electric wave absorbing sheet that has the electric wave absorption characteristic at 2.35～2.65GHz for the 2.5GHz band.
Again, at patent documentation 2, disclosing has in anechoic chamber, determinand is become movably to constitute with antenna configurations with mensuration.At this moment, by adjustment determinand and the position of measuring with antenna, even when the electromagnetic wave by the radiation of determinand institute has in the anechoic chamber, internal reflection, a plurality of reflection wave interferences still capable of using and reduce the rank of synthesizing reflection wave.
(patent documentation 1) japanese kokai publication hei 10-93286 communique
(patent documentation 2) japanese kokai publication hei 6-237090 communique
Yet in the electromagnetic wave measuring apparatus of patent documentation 1, the frequency band that can measure is restricted to the absorbent bandwidth of electric wave absorbing sheet.Therefore, for example, when carrying out the characteristic amount of commenting with antenna, must have the different a plurality of electric wave silencer boxs of electric wave absorbing sheet, come these a plurality of electric wave silencer boxs are measured for the mobile phone of the electromagnetic frequency band broad of radiation-curable a plurality of frequency bands.Its result, minute is longer, and need be than large space because of putting a plurality of electric wave silencer boxs.On the other hand, but when using the wide electromagnetic wave absorber of absorption wide-band, because wave absorber makes the electric wave silencer box also be tending towards maximization greatly.
In the electromagnetic wave measuring apparatus of patent documentation 2,, therefore, must before measuring beginning, obtain determinand and the position relation of measuring with antenna owing to constitute decision determinand and the position of measuring with antenna when each is measured again.Therefore, many times on the preparation before mensuration must consume, and the low problem of operating efficiency is arranged.
Summary of the invention
The present invention is to propose in view of the problem of above-mentioned known technology, and its purpose is to provide a kind of electromagnetic wave measuring apparatus, can use small-sized electric wave silencer box, to measure for the characteristic that gives off the electromagnetic determinand of a plurality of frequency bands.
(1) invention for addressing the above problem is a kind of electromagnetic wave measuring apparatus, and possess: the electric wave silencer box is to be provided with wave absorber in the metal shell inside that is the case shape; Determinand is located in this electric wave silencer box as determination object; And measure and use antenna, be to be located at relatively in this electric wave silencer box, in order to measure electromagnetic wave from this determinand with this determinand; It is characterized in that: the electromagnetic wave that this determinand can a plurality of frequency bands of radiation; This wave absorber, the special frequency band of 1 above frequency band has high absorption characteristic in comprising this determinand institute radiated electromagnetic wave, and in comprising this determinand institute radiated electromagnetic wave other frequency band of all the other 1 above frequency bands, have low absorption characteristic; The metal shell of this electric wave silencer box has 2 opposite faces respect to one another; Be made as L1 when reflecting and inject the length dimension of measuring with the 1st reflection paths of antenna a side of these 2 opposite faces by the electromagnetic wave of this determinand institute radiation; By the electromagnetic wave of this determinand institute radiation in the opposing party's reflection of these 2 opposite faces and inject the length dimension of measuring with the 2nd reflection paths of antenna and be made as L2; When the wavelength of the centre frequency in lower 1 the above frequency band that other frequency band comprised of the absorption characteristic of this wave absorber between maximum frequency and minimum frequency is made as λ; Poor Δ L at the length L that makes the 1st, the 2nd reflection paths 1, L2 is the position of the following scope of 0.5 λ more than 0.25 λ, disposes this mensuration and uses antenna.
According to such formation, though the low electromagnetic wave of the absorption characteristic of wave absorber in the internal reflection of electric wave silencer box, also can be at 2 reflection waves of two opposite faces reflections through the poor Δ L of the 1st, the 2nd reflection paths, interfere each other and offset.Its result is even because the low electromagnetic wave of absorption characteristic of wave absorber also can suppress the influence of its reflection wave, therefore, can increase the frequency band that can measure.
By this; Even when for example the electromagnetic mobile phone of radiation-curable a plurality of frequency band is with the antenna characteristics amount of commenting; Also can in single electric wave silencer box, measure the electromagnetic wave of all frequency bands; Need not as known technology, use a plurality of electric wave silencer boxs to measure, can improve the mensuration efficiency of operation.Again,, wave absorber can be dwindled, the miniaturization of electric wave silencer box can be made compared to the absorption characteristic of wave absorber situation toward broadband development.Moreover, owing to can grasp the lower electromagnetic wave of absorption characteristic of wave absorber in advance, and can decide the position of measuring with antenna according to this electromagnetic wavelength.Therefore, need not measure position, and the less position of influence that reflection wave is sought on the electromagnetic wave measuring limit is carried out on actual limit, can simplify the preparation work before measuring and improve determination efficiency in order to determine with antenna.
(2) in the present invention; This wave absorber, the high frequency bandwidth more than the lowest band that this certain tones bandwidth is comprised has high absorption characteristic; Comprise the low frequency bandwidth of this other bandwidth of conduct of the frequency band that is lower than this certain tones bandwidth at bandwidth, have low absorption characteristic.
According to such structure, the frequency electromagnetic waves more than special frequency band can use wave absorber to absorb, with the generation of inhibitory reflex ripple.On the other hand, frequency is low electromagnetic wave than CF, can't absorb with wave absorber, can be in the metal shell internal reflection.Yet, use antenna owing to dispose to measure with the mode that produces difference Δ L at many reflection pathss, can make a plurality of reflection waves interfere and offset, and the influence of ability inhibitory reflex ripple.Again,, can dwindle wave absorber, make the miniaturization of electric wave silencer box compared to using wave absorber with the electromagnetic situation of absorbing low frequency.
(3) in the present invention, be that mensuration is disposed at antenna and determinand, on the direction of principal axis of metal shell separated from one another and at the diagonal angle of tetragonal xsect online position from misalignment.
According to such structure, compared to measuring the situation that is configured in online center, the diagonal angle of xsect with antenna and determinand, can produce difference Δ L, but utilize mutual interference and the influence of inhibitory reflex ripple of a plurality of reflection waves at many reflection pathss.
Again, to be configured in the diagonal angle of tetragonal xsect with antenna and determinand online owing to will measure, and therefore, for example can make at xsect to have symmetry across diagonal line by the mode that xsect is formed square shape.Therefore, to measure when receiving horizontal partial wave and the vertical partial wave of determinand radiation, can obtain roughly the same characteristic at 2 kinds of partial waves with antenna.Its result for example when the damping capacity of correction space, can borrow the partial wave of measuring arbitrary side characteristic, and proofread and correct for two kinds of partial waves, and can promote the operating efficiency of mensuration.
(4) in the present invention, wave absorber uses the electric wave absorbing materials of carbon containing and forms Pyramid or taper.
Therefore, when the outstanding size of the wave absorber that will protrude in metal shell increases, but the electromagnetic wave of absorbing low frequency side then.At this moment, when the outstanding size of wave absorber becomes big, it is big that the global shape of electric wave silencer box also becomes.With respect to this, in the present invention, the electromagnetic wave of lower frequency side is to utilize a plurality of reflection waves to be interfered each other and to suppress its influence, and therefore, the outstanding size that can dwindle wave absorber also can enlarge the frequency band that can measure.
(5) in the present invention, mensuration has omni-directional with antenna at the lower frequency band of the absorption characteristic of wave absorber.
At this, when measuring when having directive property with antenna, can not receive from around the influence of reflection wave, only have and directly inject the ground wave of measuring with antenna and can be received from determinand.Yet, make mensuration be tending towards maximizing owing to improving the directive property of measuring with antenna with antenna, having can't be with measuring with the problem of antenna configurations in small-sized electric wave silencer box.Therefore, in order to be configured in the small-sized electric wave silencer box, the frequency band (the for example bandwidth of lower frequency side) at lower other of the absorption characteristic of wave absorber makes mensuration have omni-directional with antenna, except that ground wave, also receives reflection wave.At this moment, the present invention, owing to be that a plurality of reflection waves are interfered each other, therefore, and even by measuring the bandwidth that receives reflection wave with antenna, influence that also can the inhibitory reflex ripple, and measure characteristic from the ground wave of determinand.
Description of drawings
Fig. 1 is the stereographic map of the electromagnetic wave measuring apparatus of embodiment of the present invention.
Fig. 2 is the sectional view of the being seen electromagnetic wave measuring apparatus of arrow II-II direction from Fig. 1.
Fig. 3 is the sectional view of the being seen electromagnetic wave measuring apparatus of arrow III-III direction from Fig. 2.
Fig. 4 is the sectional view of the being seen electromagnetic wave measuring apparatus of arrow IV-IV direction from Fig. 2.
Fig. 5 is with amplifying the stereographic map of representing around the determinand among Fig. 2.
Fig. 6 be embodiment determinand frequency band and wave absorber absorption characteristic concern key diagram.
Fig. 7 is the characteristic line chart of deviation of antenna radiation efficiency and the theoretical value of expression embodiment and comparative example.
The explanation of symbol
1 electric wave silencer box
2 metal shells
2A front face (opposite face)
2B rear surface (opposite face)
2C left side wall (opposite face)
The right wall (opposite face) of 2D
2E end face (opposite face)
2F bottom surface (opposite face)
3 wave absorbers
4 twin shaft steady arms
5 determinands
The determined antenna of 5A
6 mensuration are used antenna
8 network analysers
Embodiment
Following with reference to accompanying drawing so that the electromagnetic wave measuring apparatus of embodiment of the present invention to be detailed.
In Fig. 1 to Fig. 4, electric wave silencer box 1 is thick in the for example aluminium sheet about 1～2mm forms the metal shell 2 of box by using, and 3 formations of wave absorber that are arranged on these metal shell 2 inside.Again, electric wave silencer box 1 also can prevent inner electromagnetic reflection except intercepting the electromagnetic wave from the outside.
At this, the formation of metal shell 2 for example is to have the length about 50～100cm in Width (directions X), direction of principal axis (Y direction), short transverse (Z direction) respectively.Again, metal shell 2 has front face 2A and the rear surface 2B that is positioned at the direction of principal axis both sides, the left wall 2C that is positioned at the Width both sides and right wall 2D and is positioned at the end face 2E and the bottom surface 2F of short transverse both sides.At this moment, wall 2A, 2B forward and backward form opposite face respect to one another.Again, also form opposite face respect to one another, and end face 2E, bottom surface 2F also form opposite face respect to one another at left and right wall 2C, 2D.
Again, left and right wall 2C, 2D and end face 2E, bottom surface 2F, extending at direction of principal axis becomes tetragonal tubular, and, form square shape with the xsect (XZ plane) of direction of principal axis quadrature.Moreover, seal by front face 2A and rear surface 2B in axial both end sides.Again, at right wall 2D, for will with after the determinand 5 stated pack in the metal shell 2 and a door 2G be installed with the mode that can supply open and close.
Twin shaft steady arm 4, as shown in Figure 2, be arranged on rear surface 2B side in the inner for example direction of principal axis of electric wave silencer box 1.Again, twin shaft steady arm 4 possesses the position angle rotating part 4A that is made up of electro-motor etc., utilizes this position angle rotating part 4A, rotates to the azimuth angle theta direction around the O1 axle parallel with short transverse.
Again, on the top of twin shaft steady arm 4, be provided with elevation angle rotating part 4B, this elevation angle rotating part 4B is to use for example a plurality of gears etc., around rotating to elevation angle φ direction with the parallel O2 axle of direction of principal axis (Y direction).
Again, rotating part 4B installs determinand 5 at the elevation angle.By this, it is the center rotation with orthogonal O1 axle and these 2 axles of O2 axle that twin shaft steady arm 4 makes determinand 5, with the azimuth angle theta and the elevation angle φ of decision determinand 5.
Determinand 5 is installed in elevation angle rotating part 4B, as shown in Figure 5, use twin shaft steady arm 4 around O1 axle and these 2 the axle rotations of O2 axle.Again, determinand 5 is to be made up of for example institute such as mobile phone, action terminating machine, and has determined antenna 5A as the determination object that is used for measuring radiation efficiency.The determined antenna 5A of this moment is made up of for example whip antenna (whip antenna), built-in chip type antenna etc.Again, determinand 5, applicable can radiation the electromagnetic mobile phone etc. of a plurality of frequency bands such as 800MHz band, 900MHz band, 1.5GHz band, 1.9GHz band, 2.5GHz band, 5GHz band for example.Moreover, though determinand 5 with can radiation the electromagnetic wave person of 5 frequency bands be its example, need not be can 5 frequency bands of radiation electromagnetic wave, as long as the electromagnetic wave of 2 above frequency bands of ability radiation is promptly enough.
Mensuration is extremely shown in Figure 4 like Fig. 2 with antenna 6, is arranged on the for example front face 2A side in direction of principal axis of electric wave silencer box 1 inside.Again, will measure and be installed on antenna with antenna 6 and support tool 7, with state configuration relative with determinand 5 on the position of direction of principal axis (Y direction) partition distance size Ro.At this, measure with antenna 6, be with for example small-sized biconical antenna (biconical antenna) formation, optionally measure arbitrary side of horizontal partial wave and vertical partial wave.At this moment, mensuration constitutes with antenna 6 and uses antenna support tool 7 to switch the partial wave of being measured.Again, mensuration at the lower low-frequency band of the absorption characteristic of wave absorber 3 (for example 800MHz band, 900MHz band), has omni-directional with antenna 6.Measure the network analyser of stating after being connected in antenna 68 again.
At this, determinand 5 and measuring with antenna 6 lays respectively on the diagonal line D-D of tetragonal xsect, and is configured in and departs from the position that δ 1, past short transverse depart from δ 2 from center O toward Width.Therefore, determinand 5 and mensuration for example are arranged in the oblique upper side position in a left side of xsect with antenna 6, at Width (directions X), are configured in compared to the position of the more approaching left wall 2C of right wall 2D; In short transverse (Z direction), be configured in position near end face 2E (2F) compared to the bottom surface.
At this moment, towards the electromagnetic wave of measuring with antenna 6, its part reflects respectively and produces 2 reflection waves at left and right wall 2C, 2D by determinand 5.Again; Owing to be that determinand 5 and mensuration are configured in the position of departing from from the center O of xsect with antenna 6; Therefore, by the electromagnetic wave of 5 radiation of determinand in left wall 2C reflection and inject the length dimension of measuring with the left side reflection paths of antenna 6 and be made as L11, and; In right wall 2D reflection and when injecting the length dimension of measuring with the right side reflection paths of antenna 6 and being made as L12, the length dimension L11 of 2 reflection pathss, L12 are also inequality by the electromagnetic wave of 5 radiation of determinand.And; When the wavelength of minimum frequency (for example 824MHz) in the lower frequency band that low-frequency band comprised of the absorption characteristic of wave absorber 3 (for example 800MHz band and 900MHz band) and the centre frequency (for example 892MHz) between maximum frequency (for example 960MHz) is made as λ; Determinand 5 and mensuration are disposed at antenna 6, and the poor Δ L1 (Δ L1=|L11-L12|) of the length dimension L11 of left and right reflection paths, L12 is the position in the above following scope of 0.5 λ (0.25 λ≤Δ L1≤0.5 λ) of 0.25 λ.
Likewise, towards the electromagnetic wave of measuring with antenna 6, its part reflects respectively and produces 2 reflection waves at upper and lower end face 2E, bottom surface 2F from determinand 5.At this moment; By the electromagnetic wave of 5 radiation of determinand in end face 2E reflection and inject the length dimension of measuring with the upside reflection paths of antenna 6 and be made as L21; And; When 2F reflection and injecting was measured length dimension with the downside reflection paths of antenna 6 and is made as L22 in the bottom surface by the electromagnetic wave of 5 radiation of determinand, the length L 21 of 2 reflection pathss, L22 were also inequality.Again, determinand 5 and mensuration are disposed at antenna 6, the poor Δ L2 (Δ L2=|L21-L22|) of the length dimension L21 of upper and lower reflection paths, L22 is the position in the above following scope of 0.5 λ (0.25 λ≤Δ L2≤0.5 λ) of 0.25 λ.
Again, between determinand 5 and rear surface 2B apart from size R1 and measure with differing from one another between antenna 6 and front face 2A apart from size R2.At this moment, towards the electromagnetic wave of measuring with antenna 6, its part reflects respectively and produces 2 reflection waves at forward and backward wall 2A, 2B from determinand 5.Again; Because distance R 1, R2 difference; When will be from the electromagnetic wave of determinand 5 radiation in front face 2A reflection and inject the length dimension of measuring with the front side reflection paths of antenna 6 and be made as L31; In rear surface 2B reflection and when injecting the length dimension of measuring with the rear side reflection paths of antenna 6 and being made as L32, the length dimension L31 of 2 reflection pathss, L32 are also inequality from the electromagnetic wave of determinand 5 radiation.Again, determinand 5 and mensuration are disposed at antenna 6, the poor Δ L3 (Δ L3=|L31-L32|) of the length dimension L31 of forward and backward reflection paths, L32 is the position in the above following scope of 0.5 λ (0.25 λ≤Δ L3≤0.5 λ) of 0.25 λ.
Network analyser 8 is as shown in Figure 2, constitutes the electromagnetic field analyzer in order to the electromagnetic field of measuring determinand 5 (determined antenna 5A) institute's radiation, and it is connected in determined antenna 5A via HF link 8A, and is connected in mensuration with antenna 6 via HF link 8B.At this moment, one of HF link 8A, 8B distolateral outside network analyser 8, another distolateral inside of then inserting electric wave silencer box 1 of being connected in via the web joint that is arranged on front face 2A 9.Again, network analyser 8 uses to measure and receives the electromagnetic wave (high-frequency signal) that is sent by determined antenna 5A with antenna 6.By this, network analyser 8 calculate the power that is supplied to determined antenna 5A with from the ratio of measuring with the received power of antenna 6, determine the parameter S 21 of the S ranks suitable with the loss amount in space.
The electromagnetic wave measuring apparatus of this embodiment possesses above-mentioned formation, secondly, the assay method of the antenna performance (antenna radiation efficiency) of using this electromagnetic wave measuring apparatus is described.
At first, determinand 5 is installed in twin shaft steady arm 4.At this moment, determinand 5 is arranged to horizontality.Again, measure beginning before, network analyser 8 will be connected in determinand 5 HF link 8A, be connected in the HF link 8B that measures with antenna 6 and directly link, carry out the correction (correction) of scale to be directed against the loss deal that HF link 8A, 8B caused.
Then, rotating part 4A, the 4B of operation twin shaft steady arm 4 are positioned the attitude of determinand 5 for the position that azimuth angle theta and elevation angle φ are all 0 °.Under this state, use network analyser 8, receive horizontal partial wave through measuring with antenna 6 by determinand 5 (determined antenna 5A) institute's radiation, measure the parameter S 21 (R0,0 °, 0 °) of this moment.Again, when the parameter S 21 of the determinand 5 that is through with 1 attitude (R0,0 °, after mensuration φ), then operate the position angle rotating part 4A of twin shaft steady arm 4, the azimuth angle theta of determinand 5 is increased by 10 ° to carry out the mensuration of parameter S 21 (R0,10 °, 0 °) once more.In azimuth angle theta is that 0 °～360 ° scope repeats this operation.
Again, when determinand 5 behind 1 circle of rotation on the azimuth angle theta direction, use network analyser 8, receive vertical partial wave through measuring with antenna 6 by determinand 5 (determined antenna 5A) institute's radiation.Use this moment antenna to support tool 7, switch to vertical partial wave from horizontal partial wave measuring the partial wave of being measured with antenna 6.Under this state, same during with above-mentioned horizontal partial wave, once again the elevation angle φ of determinand 5 is fixed under 0 ° the state, make the position angle rotating part 4A rotation of twin shaft steady arm 4.By this, be that 0 °～360 ° scope is with for example whenever at a distance from the parameter S 21 (R, θ, 0 °) of 10 ° of angle θ directions that fix the position in azimuth angle theta.
After the mensuration that is through with when elevation angle φ is fixed in 0 °, the elevation angle rotating part 4B of operation twin shaft steady arm 4 increases by 10 ° with the elevation angle φ of determinand 5.Under this state, make azimuth angle theta every at a distance from 10 ° of changes, to carry out the mensuration of parameter S 21 (R, θ, 10 °) in 0 °～360 ° scope once more for horizontal partial wave and vertical partial wave.In azimuth angle theta is that the scope that 0 °～360 ° scope and elevation angle φ is 0 °～180 ° repeats above the operation, with the parameter S 21 that is determined at each azimuth angle theta and elevation angle φ (R, θ, φ).
Again, after the mensuration that is through with to all azimuth angle theta and elevation angle φ, for each azimuth angle theta and elevation angle φ, with the mensuration result's of horizontal partial wave square S21
2(R, θ, φ) and the mensuration result's of vertical partial wave square S21
2(φ) addition is to calculate square S21 of final parameter S 21 for R, θ
2(R, θ, φ).At this moment, the mensuration result of horizontal partial wave and the mensuration result of vertical partial wave, be not be with measured by network analyser 8 represent the measured value of (dB) with logarithm, but with the numerical value addition that converts to after the antilog.
At last, (R, θ φ), carry out surface integral to the total space, calculate the radiation efficiency η (antenna performance of determined antenna 5A) of determinand 5 according to following mathematical expression 1 to the mensuration result's of the mensuration result of horizontal partial wave and vertical partial wave parameter S 21.
(mathematical expression 1)
Again, in mathematical expression (1), the wavelength of frequency is measured in λ 0 expression, and G representes to measure the gain with antenna 6.Again, Δ φ representes the stepping amount of the mensuration angle of elevation angle φ direction, and Δ φ is to be 10 ° (Δ φ=π/18 [radians]) in this embodiment.Moreover Δ θ representes the mensuration angle stepping amount of azimuth angle theta direction, and Δ θ for example is 10 ° (Δ θ=π/18 [radians]) in this embodiment.
This embodiment uses above-mentioned assay method person, therefore then, the use electromagnetic wave measuring apparatus of this embodiment is compared with the situation (theoretical value) of measuring radiation efficiency at free space with the situation of measuring radiation efficiency, to grasp its deviation.Its result is represented with solid line in Fig. 7.
Determinand 5 and mensuration are configured in the center O of xsect and measure radiation efficiency with the usefulness as comparative example with antenna 6, and compare with the theoretical value of measuring radiation efficiency at free space again.Its result is represented by dotted lines in Fig. 7.
Moreover, in the situation of this embodiment and comparative example, all be the mensuration that the scope of striding 800MHz～2.4GHz is carried out radiation efficiency.Again, wave absorber 3 is to use 5 inches pyramid object of carbon containing, has at 1GHz-20dB, has at 3GHz-30dB, has at 10GHz-absorption characteristic of 45dB.Moreover their absorption characteristic is the business directory value of absorber manufacturer when the mensuration vertical incidence characteristic in the far field shown in the catalogue.
Again, employed electric wave silencer box 1 (metal shell 2), its Width (directions X) is of a size of 58cm, and short transverse (Z direction) is of a size of 58cm, and direction of principal axis (Y direction) is of a size of 78cm.Again; Determinand 5 and measuring with antenna 6 in the lower electromagnetic centre frequency of the absorption characteristic of wave absorber 3; When for example being the 900MHz left and right sides, be to be configured in the position of departing from 4cm (δ 1=δ 2=4cm) respectively from the center O of xsect respectively in Width and short transverse.Again, with determinand 5 be disposed at rear surface 2B be the position of 28cm apart from size R1, with measure use antenna 6 be disposed at front face 2A apart from the position of size R2 as 20cm.Moreover, determinand 5 and measure and to be configured to 30cm apart from size R0 with 6 on antenna.
On the other hand, when the situation of comparative example, though use the electric wave silencer box 1 identical with embodiment, determinand 5 and mensuration are configured in the center O of xsect with antenna 6.Again, with determinand 5 be disposed at rear surface 2B be the position of 24cm apart from size R1, and, with measure use antenna 6 be disposed at front face 2A apart from the position of size R2 as 24cm.
According to the result of Fig. 7, in comparative example,, be-1.5dB～2.1dB with respect to the deviation of theoretical value in the scope of 800MHz～2.4GHz.With respect to this, in this embodiment, be-0.1dB～1.1dB, near theoretical value with respect to the deviation of theoretical value.
If with the frequency band shrinkage limit of mobile phone, in the bandwidth of 824～960MHz, the deviation of comparative example is-0.4dB～1.8dB that with respect to this, the deviation of this embodiment is 0.1dB～0.8dB.Again, in the bandwidth of 1710～2170MHz, be-0.1dB～1.1dB, to be 0.2dB～1.0dB in the deviation of this embodiment with respect to this in the deviation of comparative example.As shown in, in this embodiment, can the deviation with respect to theoretical value be reduced to ± 1.0dB in.
With the use ball detent (spherical positioner) of known method situation, compare with the situation of this embodiment, to grasp its deviation with the radiation efficiency of measuring the far field again.Moreover in the situation of known method, measuring distance (determinand 5 and mensuration are with the distance between antenna 6) is with the value of 1.7m as the far field, to carry out the planar mensuration in the whole world for determinand.Can be understood by its result, the deviation of this embodiment and known method is in ± 1.0dB, and is consistent with the mensuration result in far field.
So; In this embodiment; In lower 1 the above frequency band that frequency band comprised of the absorption characteristic of wave absorber 3, the wavelength of the centre frequency between its maximum frequency and minimum frequency is made as λ, at this moment; To measure with antenna 6 and be disposed at, the length dimension L12 of length dimension L11, L21, L31 and the reflection paths of reflection paths, L22, the poor Δ L1 of L32, Δ L2, Δ L3 are the position of the above following scope of 0.5 λ of 0.25 λ.Therefore; Even the lower electromagnetic wave of the absorption characteristic of wave absorber 3 is in 1 internal reflection of electric wave silencer box; At left wall 2C, end face 2E, front face 2A and right wall 2D, bottom surface 2F, and 2 reflection waves being reflected of rear surface 2B; The difference DELTA L1 of mat reflection paths, Δ L2, Δ L3 and produce phase differential offset through interfering with each other.Its result, though the electromagnetic wave lower to the absorption characteristic of wave absorber 3, but the also influence of inhibitory reflex ripple, thereby can enlarge the frequency band that can supply measure.
By this; In the characteristic of estimating the electromagnetic determinand 5 of radiation-curable a plurality of frequency bands; When for example the multifrequency mobile phone with 800MHz band～5GHz band being made evaluating characteristics; Also can in single electric wave silencer box, measure the electromagnetic wave of all frequency bands, need not use a plurality of electric wave silencer boxs to measure like ground as the known technology, and can improve the mensuration efficiency of operation.
Owing to can grasp the lower electromagnetic wave of absorption characteristic of wave absorber 3 in advance, therefore, can decide the position of measuring with antenna 6 according to this electromagnetic wavelength X again.Therefore, need not be in order to determine to measure position, and seek the less position of reflection wave influence like the actual electromagnetic wave measuring limit of carrying out of rand as the known technology with antenna 6, can simplify the preparation work before measuring and improve determination efficiency.
Moreover, in the high frequency band of wave absorber 3 more than the lowest band (for example 1.5GHz band) that special frequency band comprised, have high absorption characteristic, and, then have low absorption characteristic at the low-frequency band that comprises the frequency band that is lower than special frequency band (800MHz band, 900MHz band).Therefore, for example using the multifrequency mobile phone with as determinand 5 time, (1710～2170MHz) electromagnetic wave can use wave absorber 3 to absorb, with the generation of inhibitory reflex ripple in the high frequency side bandwidth.On the other hand, (824～960MHz) electromagnetic wave can't be absorbed by wave absorber 3, can be in metal shell 2 internal reflections in the bandwidth of the lower frequency side of multifrequency mobile phone.Yet, owing to be to dispose with the mode that produces difference DELTA L1, Δ L2, Δ L3 at a plurality of reflection pathss to measure, therefore can make a plurality of reflection waves interfere with each other and offset with antenna 6, but the influence of inhibitory reflex ripple.
Particularly, wave absorber 3 is to use the electric wave absorbing materials of carbon containing and forms Pyramid or taper, therefore, is borrowing the outstanding size that increases from the outstanding wave absorber 3 of metal shell 2, but the electromagnetic wave of absorbing low frequency side then.At this moment, after the outstanding size of wave absorber 3 became greatly, it is big that the global shape of electric wave silencer box 1 also can become.With respect to this, the electromagnetic wave of the lower frequency side in this embodiment can suppress its influence by the mutual interference of a plurality of reflection waves, and therefore, the outstanding size that can dwindle wave absorber 3 can enlarge the bandwidth of the frequency that can supply measure again.Its result compared to the absorption characteristic of wave absorber 3 is enlarged frequency domain, when using wave absorber 3 to come the electromagnetic situation of absorbing low frequency, can dwindle wave absorber 3, reaches the miniaturization of electric wave silencer box 1.
Again; Measure with antenna 6 and determinand 5; Be configured to respectively separated from one another on the direction of principal axis of metal shell 2 and be positioned on the diagonal line D-D of tetragonal xsect from the position that center O departs from, therefore, compared to measuring when being configured in the situation of the center O on the diagonal line D-D of xsect with antenna 6 and determinand 5; Can produce difference DELTA L1, Δ L2 at many reflection pathss, can utilize the influence of the mutual interference of a plurality of reflection waves with the inhibitory reflex ripple.
Moreover, owing to be configured on the diagonal line D-D of tetragonal xsect with antenna 6 and determinand 5 with measuring, therefore, can be by for example xsect being formed foursquare mode, make xsect clip diagonal line D-D and have symmetry.Therefore, when measuring, can obtain roughly the same characteristic at 2 kinds of partial waves with the horizontal partial wave of 5 radiation of antenna 6 reception determinands and vertical partial wave.Its result for example when the damping capacity of correction space, can proofread and correct for two kinds of partial waves by the partial wave characteristic of measuring arbitrary side, and can promote the operating efficiency of mensuration.
Again, measure with antenna 6 in the lower low-frequency band of the absorption characteristic of wave absorber 3, have omni-directional.At this, when mensuration has directive property with antenna 6, can not receive influence from reflection wave on every side, only can receive by determinand 5 and directly inject the ground wave of measuring with antenna 6.Yet its problem is, can make to measure with antenna 6 and is tending towards maximization owing to measure raising with the directive property of antenna 6, and can't mensuration be configured in the small-sized electric wave silencer box 1 with antenna 6.Therefore, in order to want to be configured in the small-sized electric wave silencer box 1, in the lower low-frequency band of the absorption characteristic of wave absorber 3, mensuration has omni-directional with antenna 6, except that ground wave, also receives reflection wave.At this moment, in this embodiment, a plurality of reflection waves are interfered each other, therefore, just measure in the bandwidth of the reception reflection wave with antenna 6 at mat at last, influence that can the inhibitory reflex ripple also can be measured the characteristic from the ground wave of determinand 5.
Moreover, in aforementioned embodiments, determinand 5 and to measure with antenna 6 all be to be configured in the position of departing from from the center O of xsect, yet, for example also can only determinand 5 and mensuration be configured in the position of departing from from the center O of xsect with arbitrary side in the antenna 6.
Again, wave absorber 3 in this embodiment is to form Pyramid or taper, yet, for example form the sheet person identical and also can with known technology.
Again; The example that wave absorber 3 is in this embodiment lifted, the high frequency band comprising 4 frequency bands (1.5GHz band, 1.9GHz, 2.5GHz, 5GHz band) has high absorption characteristic; Low-frequency band comprising 2 frequency bands (800MHz band, 900MHz band) has low absorption characteristic.Yet the present invention is not limited thereto, and the formation of wave absorber also can be exemplified as, and has high absorption characteristic at the high frequency band of 5 frequency bands that comprise 900MHz band～5GHz band, has low absorption characteristic in the low-frequency band that comprises 1 frequency band (800MHz band).In this situation, be that the maximum frequency of 800MHz band and the wavelength of the centre frequency between minimum frequency are made as λ, measure position with decision with antenna etc.
Moreover, in the formation of aforementioned embodiments, use mobile phone, but also can use other machine of ability radiated electromagnetic wave as determinand 5.In aforementioned embodiments,, also can use the antenna of other form though use biconical antenna as measuring with antenna 6 again.
Claims (6)
1. electromagnetic wave measuring apparatus possesses:
The electric wave silencer box is provided with wave absorber in the metal shell inside that is the case shape;
Determinand is located in this electric wave silencer box as determination object; And
Measure and use antenna, be located at relatively in this electric wave silencer box, in order to measure electromagnetic wave from this determinand with this determinand;
It is characterized in that:
The electromagnetic wave of a plurality of frequency bands of said determinand radiation;
Said wave absorber constitutes: in comprising by said determinand institute radiated electromagnetic wave, in the special frequency band of 1 above frequency band, have high absorption characteristic; And in comprising, in other the frequency band of all the other 1 above frequency bands, has low absorption characteristic by said determinand institute radiated electromagnetic wave;
The metal shell of said electric wave silencer box has 2 opposite faces respect to one another;
When will be by the electromagnetic wave of said determinand institute radiation in a reflection of said 2 opposite faces and inject the length dimension of measuring with the 1st reflection paths of antenna and be made as L1; By the electromagnetic wave of said determinand institute radiation in another reflections of this 2 opposite faces and inject the length dimension of measuring with the 2nd reflection paths of antenna and be made as L2; When the wavelength of the centre frequency in lower said other 1 the above frequency band that frequency band comprised of the absorption characteristic of this wave absorber between maximum frequency and minimum frequency is made as λ; Poor Δ L at the length dimension L1 that makes said the 1st, the 2nd reflection paths, L2 is the position of the following scope of 0.5 λ more than 0.25 λ, disposes this mensuration and uses antenna.
2. electromagnetic wave measuring apparatus according to claim 1 is characterized in that,
Said wave absorber in the high frequency band more than the lowest band that said special frequency band comprised, has high absorption characteristic; In said other the low-frequency band of frequency band of the conduct that comprises the frequency band lower, has low absorption characteristic than this special frequency band.
3. electromagnetic wave measuring apparatus according to claim 1 is characterized in that,
This metal shell forms tetragonal tubular;
Said mensuration is configured in respectively with antenna and determinand, on separated from one another on the direction of principal axis of this metal shell and diagonal line at tetragonal xsect from the position of misalignment.
4. electromagnetic wave measuring apparatus according to claim 1 is characterized in that,
Said wave absorber is to use the electric wave absorbing materials of carbon containing and forms taper.
5. electromagnetic wave measuring apparatus according to claim 4 is characterized in that,
Said wave absorber is to use the electric wave absorbing materials of carbon containing and forms Pyramid.
6. electromagnetic wave measuring apparatus according to claim 1 is characterized in that,
Said mensuration is used antenna, in lower said other the frequency band of the absorption characteristic of said wave absorber, has omni-directional.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2007-197463 | 2007-07-30 | ||
| JP2007197463 | 2007-07-30 | ||
| PCT/JP2008/062162 WO2009016923A1 (en) | 2007-07-30 | 2008-07-04 | Electromagnetic wave measuring apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101765777A CN101765777A (en) | 2010-06-30 |
| CN101765777B true CN101765777B (en) | 2012-10-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008801005202A Expired - Fee Related CN101765777B (en) | 2007-07-30 | 2008-07-04 | Electromagnetic wave measuring apparatus |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JP5018885B2 (en) |
| KR (1) | KR101038352B1 (en) |
| CN (1) | CN101765777B (en) |
| TW (1) | TW200921117A (en) |
| WO (1) | WO2009016923A1 (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8703492B2 (en) | 2007-04-06 | 2014-04-22 | Qiagen Gaithersburg, Inc. | Open platform hybrid manual-automated sample processing system |
| CN102809683B (en) * | 2011-06-29 | 2015-04-01 | 深圳光启高等理工研究院 | Electromagnetic wave sensor based on planar optical waveguide and metamaterial |
| CN103091523B (en) * | 2011-10-31 | 2017-01-25 | 鸿富锦精密工业（深圳）有限公司 | Changing-over type anechoic chamber |
| CN103163339B (en) * | 2011-12-09 | 2016-12-21 | 鸿富锦精密工业（深圳）有限公司 | Anechoic chamber, |
| KR101470399B1 (en) * | 2013-12-30 | 2014-12-09 | 주식회사 이레테크 | Electromagnetic measurement system |
| KR101691303B1 (en) * | 2015-09-01 | 2016-12-29 | 금오공과대학교 산학협력단 | Electromagnetic field measuring apparatus for Extremely low frequency |
| KR102009668B1 (en) * | 2018-03-28 | 2019-08-13 | 에스아이오티 주식회사 | Movable electromagnetic wave shielding absorption performance measuring device |
| JP6876021B2 (en) * | 2018-08-24 | 2021-05-26 | アンリツ株式会社 | Electromagnetic wave shield box |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1389956A (en) * | 2001-06-01 | 2003-01-08 | 汤姆森特许公司 | Apparatus for detecting and receiving electromagnetic wave |
| CN1737585A (en) * | 2004-08-20 | 2006-02-22 | 虹光精密工业（苏州）有限公司 | Electromagnetic wave detecting system |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05183289A (en) * | 1991-12-27 | 1993-07-23 | Hitachi Eng Co Ltd | Radio wave absorbent |
| JPH10112595A (en) * | 1996-10-04 | 1998-04-28 | Tokin Corp | Radio wave absorber |
| JPH10282174A (en) * | 1997-04-08 | 1998-10-23 | Ando Electric Co Ltd | Shield box |
| JP2000214201A (en) | 1999-01-28 | 2000-08-04 | Matsushita Electric Ind Co Ltd | Antenna measuring method and measuring apparatus |
| JP2005061949A (en) * | 2003-08-11 | 2005-03-10 | Device Co Ltd | Electromagnetic wave measuring camera obscura |
| US7773964B2 (en) * | 2004-10-25 | 2010-08-10 | Qualcomm Incorporated | Systems, methods and apparatus for determining a radiated performance of a wireless device |
| JP4948810B2 (en) * | 2005-09-16 | 2012-06-06 | 学校法人五島育英会 | Radio wave absorber |
-
2008
- 2008-07-04 TW TW97125166A patent/TW200921117A/en not_active IP Right Cessation
- 2008-07-04 JP JP2009525320A patent/JP5018885B2/en not_active Expired - Fee Related
- 2008-07-04 CN CN2008801005202A patent/CN101765777B/en not_active Expired - Fee Related
- 2008-07-04 KR KR1020107001979A patent/KR101038352B1/en not_active IP Right Cessation
- 2008-07-04 WO PCT/JP2008/062162 patent/WO2009016923A1/en active Application Filing
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1389956A (en) * | 2001-06-01 | 2003-01-08 | 汤姆森特许公司 | Apparatus for detecting and receiving electromagnetic wave |
| CN1737585A (en) * | 2004-08-20 | 2006-02-22 | 虹光精密工业（苏州）有限公司 | Electromagnetic wave detecting system |
Non-Patent Citations (7)
| Title |
|---|
| JP特开2000-214201A 2000.08.04 |
| JP特开2007-87980A 2007.04.05 |
| JP特开平10-112595A 1998.04.28 |
| JP特开平10-282174A 1998.10.23 |
| JP特开平10-93286A 1998.04.10 |
| JP特开平5-183289A 1993.07.23 |
| JP特开平6-237090A 1994.08.23 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPWO2009016923A1 (en) | 2010-10-14 |
| JP5018885B2 (en) | 2012-09-05 |
| WO2009016923A1 (en) | 2009-02-05 |
| TW200921117A (en) | 2009-05-16 |
| CN101765777A (en) | 2010-06-30 |
| KR20100031134A (en) | 2010-03-19 |
| TWI372253B (en) | 2012-09-11 |
| KR101038352B1 (en) | 2011-06-01 |
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