CN1693910B - Radio-frequency noise removing chamber with improvement testing platform - Google Patents
Radio-frequency noise removing chamber with improvement testing platform Download PDFInfo
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- CN1693910B CN1693910B CN 200510056046 CN200510056046A CN1693910B CN 1693910 B CN1693910 B CN 1693910B CN 200510056046 CN200510056046 CN 200510056046 CN 200510056046 A CN200510056046 A CN 200510056046A CN 1693910 B CN1693910 B CN 1693910B
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Abstract
The invention relates to a radio frequency noise-damping test cabinet (100) comprising a test table (118) which comprises a vertical support cylinder (202) embed in the bottom with small diameter and large strength and a center vertical support cylinder (204) with large diameter and thin wall. The center vertical support cylinder (204) comprises a cover layer or a coat of an absorbing material (224) arranged at the periphery of the thin-wall center support cylinder (204) and an upper support component (206). The radio frequency noise-damping test cabinet provides the improved ripple performance and realizes more accurate measurement of plus mode of the radio frequency equipment.
Description
Technical field
The present invention relates to the radio frequency anechoic chamber in general.
Background technology
The radio frequency anechoic chamber is used to the repeated environment that provides controlled, is used to carry out the radio-frequency radiation test.The radio frequency anechoic chamber is intended to be similar to the electromagnetic wave free space of infinite region and be intended to provide such environment: wherein can carry out the radio-frequency radiation test and can not introduce the mistake that is caused by reflection wave or standing wave.
One of test-types of carrying out in the radio frequency anechoic chamber is (to be called as and to be subjected to measurement equipment, the power measurement that gives off in EUT) from a radio-frequency apparatus as polarity and azimuthal function.Such test has realized the integrity property of the electromagnetic spatial coherence of EUT radiation.Floor, ceiling and the wall of radio frequency noise reduction test cabinet provides these radio frequency absorption bodies to reduce reflection and standing wave substantially with the tiling of radio frequency absorption body.Provide EUT away from absorbing wall, ceiling and floor, it is in chamber central authorities, so that measure usually.Increasing a support to EUT also makes the measurement antenna to move so that observe EUT from the polarity angle of a wide region (near 180 degree).For fear of the large-scale interference of the radio-frequency field of EUT emission, this support is made by the insulating material opposite with metal., even the support of insulation is also disturbed radio-frequency field and can be caused reflection, this reflection makes the measurement distortion of carrying out in the radio frequency anechoic chamber.
In being equipped with the anechoic chamber that EUT supports, measure rf wave do not wish reflect rank and be configured to be used for measure a kind of method as the radiated radio frequency (RF) wave power of the function of polarity angle be an emitting antenna is being installed in the EUT of anechoic chamber supports and is being measured the power that a receiving antenna receives in respect to this emitting antenna at mobile this receiving antenna (being also referred to as probe) on the polarity angle on a large scale, wherein said emitting antenna is as function (for example, the dipole antenna of the horizontal direction) radiation equably of polarity angle.In having the desirable desirable radio frequency noise reduction test cabinet that supports, often do not change in the measured field.The variation that occurs is called as " ripple ".Ripple may be that the support by the interference that produces the radio-frequency field of launching in the emitting antenna is caused to a certain extent.
When the support of design EUT, remove to reduce by this being supported on the interference of the radio-frequency field that causes in the anechoic chamber, this support also must be formed into enough powerful so that support EUT and will be placed in all miscellaneous equipments in this support with EUT.Realize that high mechanical robustness means that this support should be to be made by thick section material., the radio-frequency field that uses thick section material will tend to increase to be caused by this support disturbs.Another one requires; Along with the receiving antenna in the anechoic chamber with respect to the EUT that supports upper support at one on a large scale on the polarity angle when mobile, this supports, and disturb should be as far as possible little.
Therefore, need a kind of radio frequency noise reduction test cabinet that EUT supports that has that satisfies above-mentioned design specifications that has.
Description of drawings
In the accompanying drawings will be but whether described the present invention as restriction in the mode of most preferred embodiment, in the accompanying drawing similarly Reference numeral represent similar element, wherein:
Fig. 1 is the sectional views according to the radio frequency noise reduction test cabinet of an embodiment;
Fig. 2 is to use the local x ray view of the test board in radio frequency noise reduction test cabinet as shown in Figure 1;
Fig. 3 is the exploded view of test board as shown in Figure 2;
Fig. 4 is the planimetric map of radio frequency absorption body under the state that spreads out that uses in the test board shown in Fig. 2-3;
Fig. 5 is the local x ray side view of the test board shown in Fig. 2-3, and half of a U-shaped swing arm that is used to support the measurement antenna in the radio frequency noise reduction test cabinet as shown in Figure 1;
Fig. 6 is the curve map that the ripple measured value of each test board is shown;
Fig. 7 is the anistree prismatic upper support according to test board shown in Fig. 2 of an alternative enforcement-3,5; With
Fig. 8 is the thin walled tube according to test board shown in Fig. 2 of an alternative enforcement-3,5.
Embodiment
As needs, specific embodiment of the present invention is here disclosed; , it should be understood that the disclosed embodiments are demonstration of the present invention, it can specifically be implemented with various forms.Therefore, disclosed here ad hoc structure and function detail should not be understood that restriction, and just as basis of claim and as be used for instructing those skilled in the art to use a representative basis of the present invention in any suitably detailed structure of reality diversifiedly.In addition, noun and the phrase that here uses do not mean restriction; Provide a understandable explanation of the present invention and would rather say so.
Here the noun of Shi Yonging " " is defined as one or more.Here the noun of Shi Yonging " a plurality of " is defined as two or more.Here the noun of Shi Yonging " another one " is defined as at least the second or more.Here the noun of Shi Yonging " comprise and/or have " is defined as comprising (that is open language).Here the noun of Shi Yonging " coupling " is defined as connecting, though may not be directly to connect and may not be mechanical connection.
Fig. 1 is the sectional views according to the radio frequency noise reduction test cabinet 100 of an embodiment.Noise reduction test cabinet 100 is defined by a metal package layer 102.Metal package floor 102 is used for stoping the radio frequency or other electromagnetic wave that send from test cabinet 100 outsides to enter test cabinet 100 and worsen the measured value of catching the chamber 100.In embodiment as shown in Figure 1, noise reduction test cabinet 100 is square frame shapes, and metal package layer 102 comprises ceiling 104, floor 106 and four walls 108 (wherein two in Fig. 1 local as seen).Alternately, noise reduction test cabinet 100 can have another shape, such as other prismatic (for example, five jiaos, hexagonal prismoid shape), cylinder or semisphere.
It in metal surface 102 an inner involucrum 110 of making by scale board or other material.The second metal surface (not shown) is included in the inner involucrum 110 as selecting.In embodiment as shown in Figure 1, inner involucrum 110 comprises floor 112, ceiling (invisible among Fig. 1), left wall 114, right wall 116, rear wall (invisible among Fig. 1) and antetheca (invisible among Fig. 1).
A U-shaped swing arm 124 is placed in the chamber 100.Swing arm 124 comprises horizontal gird 126, and it vertically is connected to first radial arm 128 and second radial arm (invisible among Fig. 1) at opposite end.The first arc slit 130 in the left wall 114 of horizontal gird 126 inleakage involucrums 110, and the second identical shaped arc slit 132 in the right wall 116 of inner involucrum 110.First radial arm 128 is disposed between the wall 108 of the right wall 116 of inner involucrum 110 and extexine 102.Similarly, second radial arm (it is parallel to first radial arm, but invisible in Fig. 1) is disposed between the left wall 114 and extexine 102 of inner involucrum 110.The not end of two radial arms 128 extends to virtual pivot 134 away from horizontal gird 126, and swing arm 124 is around virtual pivot 134 rotations.Virtual pivot 134 intersects with the axle 135 that runs through test board 118.At virtual pivot 134 places, first radial arm 128 is connected to first shaft 136, and the second radial arm (not shown) is coupled to the second shaft (not shown).First shaft 136 extends through extexine 102 and is supported by bearing 138.The second shaft (not shown) is suitably supported similarly.First shaft 136 is coupled to step motor 140, thereby step motor 140 is used for rotary oscillation arm 124 and the controlling level crossbeam 126 polarity angle with respect to EUT 122.
Though not shown among Fig. 1, test board 118 suitably is supported on the wheelwork 504 (Fig. 5) on the floor 112 that is positioned at inner involucrum 110, so so that support the position angle of the test board 118 of EUT 122 to change with respect to measuring antenna 142.Therefore, the radiofrequency signal of sending on polarity and position angle angular range can be measured in chamber 100.
Radio frequency uses instrument 144 to be positioned at outside the chamber 100.Radio frequency uses instrument 144 suitably to comprise spectrum analyzer or is suitable for carrying out the miscellaneous equipment of rf power measurement.Radio frequency uses instrument 144 to be coupled to by a cable (not shown) that connects along swing arm 124 and measures antenna 142.Alternately, radio frequency uses instrument 144 and/or master controller 146 also to be coupled to EUT 122 by another cable (not shown) that test board 118 upwards connects.
A master controller 146 (for example being equipped with the personal computer of testing tool interface hardware and software) is coupled to radio frequency and uses instrument 144, step motor 140, and is coupled to azimuthal wheelwork 504 (Fig. 5) of control test board 118.Though dispensable, master controller 146 allows test to carry out automatically.
Fig. 2 is the local x ray view of the test board 118 of use in radio frequency noise reduction test cabinet 100 as shown in Figure 1, and Fig. 3 is the exploded view of test board 118 as shown in Figure 2.Referring to Fig. 2-3, test board 118 comprises lower vertical support cylinder 202, middle part vertical support cylinder 204 and upper support member 206.Form test board 118 three main elements 202,204,206 each all must satisfy the specific performance properties requirement.
Lower vertical support cylinder 202 mechanically is coupled to position angle wheelwork 504 (Fig. 5) to test board 118. and lower vertical support cylinder 202 must be resisted the torque that is produced by position angle wheelwork 504 (Fig. 5). and lower vertical support cylinder 202 is born the highest torque and mass loading. and potential senior compressing power shows that specific bulk materials is used to mechanically make lower vertical support cylinder 202 strong. on the other hand, wish to make horizontal (degree of depth) of lower vertical support cylinder 202 small-sized, so that reduce the limited degree of the mechanical disturbance of test board 118 to the polarity angular range of swing arm 124. reduce weight bearing and torque bearing capacity that lateral dimension helps to reduce lower vertical support cylinder 202. this can compensate by use thicker cross section circummure material in lower vertical support cylinder 202,, do the volume that should avoid increasing so. lower support cylinder 202 is suitable circle in sectional view, but alternately, it can have different transverse shapes. and the height control feature of test board 118 also is built in the lower vertical support cylinder 202. and the height control characteristics allow the EUT of various height and relevant device (for example phantom 120 or phantom trunk (not shown)) to aim at the virtual pivot 134 of swing arm 124. and increase a height control feature and also test board 118 has been increased quality, this should be limited to be avoided that the radio-frequency field in the chamber 100 is produced interference., by merging to the height control feature in the lower vertical support cylinder 202 rather than expanding lower vertical support cylinder 202 from start to finish up to EUT 122, then the interference of radio-frequency field in fact greatly reduces.Lower vertical support cylinder 202 is such angular ranges of subtend not usually: in this angular range, the gain of measuring antenna 142 for high and enough away from EUT 122 so that do not cause wave reflection to from EUT, sending.
By being stretched, lower vertical support cylinder 202 obtains above-mentioned height control feature.Lower vertical support cylinder 202 comprises a lower tube 208 and a upper tube 210.Under the help of a plurality of gussets 216, the bottom 212 of lower tube 208 is attached on the mounting flange 214.Bonding agent is by the lower tube 208 that suitably is used to be coupled, mounting flange 214 and gusset 216.Upper tube 210 is resized so that be mounted in the lower tube 208.The insulation axle collar 218 is used for being provided with the height that upper tube 210 is inserted into the insertion depth in the lower tube 208 and thereby test board 118 is set.The axle collar 218 comprises a plurality of flat holes 302, and upper tube has a plurality of respective threads hole group 304.Insulation screw 220 passes flat hole 302 and is threaded in one of threaded hole group 304 so that the height of test board 118 is set.
A cone absorber 205 of the type is used for 100 arrangements along the chamber, is fit to the inside of lower tube 208 but it has pruned in the bottom, and it is positioned in the lower tube 208.Cone absorber 205 in the lower vertical support cylinder 202 is used for the interaction between the floor 106 of extexine 102 of damping EUT 122 and test cabinet 100, and this can additionally reduce the ripple performance of chamber 100.
Be used to lower vertical support cylinder 202 is coupled to the upper end 308 that first connecting elements 306 on the vertical support cylinder 204 placed in the middle is adhered to the upper tube 210 of lower vertical support cylinder 202.First connecting elements 306 comprise an inward flange 310 and internally edge 310 to extraradial more than first finger piece 312.The hole 314 that an axial direction threading is arranged in each of more than first finger piece 312.
Thin walled tube 222 comprises a plurality of openings 226, and it can be used for connecting cable for the proving installation of expecting therein signal to be coupled to EUT 122 or signal is coupled back from EUT 122.
Be used to lower vertical support cylinder 202 is coupled to the lower end 318 that second connecting elements 316 on the vertical support cylinder 204 placed in the middle is adhered to the thin walled tube 222 of vertical support cylinder 204 placed in the middle.Second connecting elements 316 comprises an outward flange 320, and from outward flange 320 inside more than second finger pieces 322 that radially extend.The flat hole 324 that an axial direction is arranged in each of more than second finger piece 322.For lower vertical support cylinder 202 being coupled to vertical support cylinder 204 placed in the middle, a plurality of insulated bolts 326 pass the flat hole 324 in second connecting elements 316 and are threaded into threaded hole 314 in first connecting elements 306.Two connecting elements the 306, the 316th, the insulation and use a kind of firm bonding agent to be properly connected to corresponding vertical support cylinder 202,204.When connecting elements 306,316 connects, exist in a plurality of annulus of definition between inward flange 310, outward flange 320 and overlapping more than first finger piece 312 and more than second finger piece 322.
Fig. 5 is the local x ray side view of the test board 118 shown in Fig. 2-3, and half of U-shaped swing arm 124 that is used for supporting the measurement antenna 142 of radio frequency noise reduction test cabinet 100. the polarity gain mode of measuring antenna 142 is schematically illustrated as 502. as shown in Figure 5, swing arm 124 rotates to a high polarity angle, θ. as what in Fig. 5, can see, when swing arm 124 rotates to high polarity angle, vertical support cylinder 204 subtends placed in the middle are about measuring a three-dimensional viewpoin scope of antenna 142, the gain of wherein measuring antenna 142 is for high. in addition, and in the direct sight line of vertical support cylinder 204 placed in the middle between EUT 122 and measurement antenna 142.But, have been found that and use the test board 118 of formation described herein to obtain good ripple performance.
Be supported on the position angle wheelwork 504 that schematically shows test board 118 as shown in Figure 5.
Fig. 6 is the curve map that the ripple measured value of each test board is shown.In curve map, horizontal ordinate is represented the polarity angle and is divided with ten intervals of spending.Ordinate is represented to measure the signal level that antenna 142 is measured, and is divided with the interval of 0.5dB.As mentioned before, use one to be designed to carry out ripple and to measure with the emitting antenna that the form of the function of polarity angle is carried out homogeneous radiation.In curve map, curve 602 is ripple measurement results of test board 118, does not have cone absorber 205 and do not have absorbing material 224 in lower vertical support cylinder 202 in vertical support cylinder 204 placed in the middle.Signal level changes to the low value of the 0.8dB at 150 degree places in the high value of about 2.5dB at 0 degree place, provides the peak to peak ripple of about 1.7dB.But curve 604 is to have cone absorber 205 the ripple measurement result that does not have the test board 118 of absorbing material 224.Signal level changes to the high value of the 2.75dB at 165 degree places suddenly from the low value of the 0.95dB of 150 degree, provides the relatively poor peak to peak ripple of a 1.8dB.Curve 606 is the ripple measurement results that cone absorber 205 not only arranged in lower vertical support cylinder 202 but also the test board 118 of absorbing material 224 is arranged in vertical support cylinder 204 placed in the middle.In this case, signal level changes to the 1.05dB low value at 165 degree places, the peak to peak ripple measurement that produces the 1.35dB of an improvement from the high value of the 2.4dB of 160 degree.
Fig. 7 is the anistree prismatic upper support member 702 of test board 118 as shown in Fig. 2-3,5 according to an alternative enforcement.
Fig. 8 is the thin walled tube 802 of test board as shown in Fig. 2-3,5 according to an alternative enforcement.The model 804 of the circular piece 806 of radio frequency absorption body is supported on the thin walled tube 802.In model 804, reduce the per unit high absorption scale of construction by the size (it is the function of height) that reduces circular piece 806.
Though the preferred embodiments of the present invention and other embodiment are illustrated and describe, and know that very the present invention so is not limited.Do not depart from the spirit and scope of the present invention of following claim definition, those of ordinary skills will expect a lot of modifications, change, variation, replacement and equivalent.
Claims (19)
1. radio frequency anechoic chamber comprises:
Test board comprises:
The first vertical support cylinder, the described first vertical support cylinder comprise the tubular one or more radio frequency absorption bodies that taper is given prominence to that have on the vertical expansion that is distributed on the described at least first vertical support cylinder.
2. according to the radio frequency anechoic chamber of claim 1, wherein, described one or more radio frequency absorption bodies comprise the open mesh foam that carbon is filled.
3. according to the radio frequency anechoic chamber of claim 1, wherein,
Described one or more radio frequency absorption body is placed the periphery of the described first vertical support cylinder of next-door neighbour.
4. according to the radio frequency anechoic chamber of claim 3, wherein:
Described one or more radio frequency absorption body is distributed on the zone that the sizable part with the circumference of the first vertical support cylinder is adjacent to extend at least.
5. according to the radio frequency anechoic chamber of claim 4, wherein:
Described one or more radio frequency absorption body comprises the radio frequency absorption material layer.
6. according to the radio frequency anechoic chamber of claim 5, wherein:
Described taper is outstanding longitudinally extends basically with respect to the described first vertical support cylinder.
7. according to the radio frequency anechoic chamber of claim 5, wherein:
Described one or more radio frequency absorption body is that the form with the absorber of the some of per unit height exists, and this absorber quantity is successively decreased along the first vertical support cylinder as the function of height.
8. according to the radio frequency anechoic chamber of claim 4, wherein:
The described first vertical support cylinder comprises the first blank pipe shape member; Be placed in the described first blank pipe shape member with described one or more radio frequency absorption bodies.
9. radio frequency anechoic chamber according to Claim 8, wherein:
The first blank pipe shape member xsect is circular.
10. radio frequency anechoic chamber according to Claim 8, wherein:
The first blank pipe shape member comprises fiberglass pipe.
11. radio frequency anechoic chamber according to Claim 8, wherein:
Described one or more radio frequency absorption body comprises the radio frequency absorption material layer.
12. according to the radio frequency anechoic chamber of claim 11, wherein:
Described taper is outstanding substantially axially extends with respect to the first vertical support cylinder.
13. according to the radio frequency anechoic chamber of claim 10, wherein:
Fiberglass pipe has one at least 30 centimetres diameter and less than 1.5 millimeters wall thickness.
14. radio frequency anechoic chamber according to Claim 8, wherein:
Described test board comprises the second vertical support cylinder that is placed on below the described first vertical support cylinder, itself and the described first vertical support cylinder are in supporting relation, wherein, the described first vertical support character column is first lateral dimension, and the described second vertical support character column is second lateral dimension, and described second lateral dimension is less than described first lateral dimension, and the described by this first vertical support cylinder stretches out the described second vertical support cylinder.
15. the radio frequency anechoic chamber according to claim 14 also comprises:
Be used to and support the swing arm of measuring antenna, and on about a polarity angular range of first, swing, described first intersects with an axle that passes described test board, wherein, at high polarity angle place, described swing arm is near the described second vertical support cylinder, and on these directions, locate described measurement antenna so that watch equipment under the test antenna that is positioned on the described first vertical support cylinder, sight line between the described equipment under wherein said measurement antenna and the test antenna and the described first vertical support cylinder intersect.
16. the radio frequency anechoic chamber according to claim 14 also comprises:
The 3rd vertical support that is placed on above the described first vertical support cylinder and supports by the described first vertical support cylinder.
17. according to the radio frequency anechoic chamber of claim 16, wherein: described the 3rd vertical support comprises expanded polystyrene (EPS).
18. the radio frequency anechoic chamber according to claim 16 also comprises:
The radio frequency testing model that is placed on above described the 3rd vertical support and supports by described the 3rd vertical support.
19. the radio frequency anechoic chamber according to claim 14 also comprises:
First connecting elements, it has first edge, and more than first finger piece inwardly radially extension from described first edge, and described therein first edge is affixed to the described first vertical support cylinder lower end again; With
Second connecting elements, it has second edge, and more than second finger piece extends from the described second edge outward radial, and described therein second edge is affixed to the upper end of the described second vertical support cylinder, and described more than first and second finger pieces are placed with overlapping relation.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US10/805,995 US7627497B2 (en) | 2003-03-26 | 2004-03-22 | Method for selling lottery tickets from a POS terminal |
| US10/805,995 | 2004-03-22 |
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| Publication Number | Publication Date |
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| CN1693907A CN1693907A (en) | 2005-11-09 |
| CN1693910B true CN1693910B (en) | 2010-05-12 |
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| CN 200510056046 Active CN1693910B (en) | 2004-03-22 | 2005-03-21 | Radio-frequency noise removing chamber with improvement testing platform |
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| US8002078B2 (en) * | 2009-02-19 | 2011-08-23 | Bose Corporation | Acoustic waveguide vibration damping |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4274048A (en) * | 1978-12-18 | 1981-06-16 | General Dynamics Corporation, Electronics Division | Three-dimensional measurement of radiant energy scattering characteristics with a turntable-type scanning interferometer |
| US4968983A (en) * | 1988-01-20 | 1990-11-06 | Kabushiki Kaisha Toshiba | Radiation field characteristic measuring apparatus |
| US5028928A (en) * | 1990-06-26 | 1991-07-02 | Vidmar Robert J | Ultra-stable, stressed-skin inflatable target support systems |
| US5099244A (en) * | 1990-08-06 | 1992-03-24 | Lockheed Corporation | Support pylon for radar cross-section model testing |
| US5812080A (en) * | 1995-12-27 | 1998-09-22 | Takahashi; Michiharu | Broad-band radio wave absorber |
| US6329953B1 (en) * | 2000-09-29 | 2001-12-11 | Rangestar Wireless | Method and system for rating antenna performance |
-
2005
- 2005-03-21 CN CN 200510056046 patent/CN1693910B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4274048A (en) * | 1978-12-18 | 1981-06-16 | General Dynamics Corporation, Electronics Division | Three-dimensional measurement of radiant energy scattering characteristics with a turntable-type scanning interferometer |
| US4968983A (en) * | 1988-01-20 | 1990-11-06 | Kabushiki Kaisha Toshiba | Radiation field characteristic measuring apparatus |
| US5028928A (en) * | 1990-06-26 | 1991-07-02 | Vidmar Robert J | Ultra-stable, stressed-skin inflatable target support systems |
| US5099244A (en) * | 1990-08-06 | 1992-03-24 | Lockheed Corporation | Support pylon for radar cross-section model testing |
| US5812080A (en) * | 1995-12-27 | 1998-09-22 | Takahashi; Michiharu | Broad-band radio wave absorber |
| US6329953B1 (en) * | 2000-09-29 | 2001-12-11 | Rangestar Wireless | Method and system for rating antenna performance |
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| CN1693907A (en) | 2005-11-09 |
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Address after: Illinois State Patentee after: Motorola Mobility, Inc. Address before: Illinois State Patentee before: Motorola Mobility LLC |
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Effective date of registration: 20161017 Address after: American California Patentee after: Technology Holdings Co., Ltd of Google Address before: Illinois State Patentee before: Motorola Mobility, Inc. |