CN1355945A - Reverberation chamber tuner and shaft with electromagnetic radiation leakage device - Google Patents

Abstract

A tuner (10) for a reverberation chamber is provided comprising a plurality of electrically conductive surfaces (12) attached to each other in a Z-fold configuration. Each lateral edge (15) of the tuner is contacted with a generally planar, laterally positioned substrate (16) which prevents lateral extension or medial compression of the Z-fold. Optionally, end substrates (18) are attached to each of the two leading edges (17). Also, a device minimizes electromagnetic radiation leakage along a shaft including: a bearing housing; a plurality of thrust bearings contacting the bearing housing and axially juxtaposed along the shaft so that at least two thrust bearings oppose each other; a radial bearing intermediate each thrust bearing; and a provision for adjustably moving the thrust bearings toward each other so as to compress the thrust bearings against the bearing housing.

Description

Reverberation chamber tuner and rotating shaft with electromagnetic radiation leakage device

Invention field

The present invention relates to the electromagnetic radiation diffuser, more particularly, tuner that the present invention relates in reverberation room, use and the installation method in reverberation room thereof.

Background technology

Owing to concentrated many emitters, so be flooded with electromagnetic radiation in the modern environment.In addition, most of electric equipments produce electromagnetic radiation at run duration.This ubiquitous electromagnetic radiation has adverse influence to some electric device.For example, near the influence of the rf frequency of motor or the two-way radio operation emission device relevant with the anti-lock brake system in the automobile should not be subjected to.Therefore, the professional test standard-required is tested some device under controlled environment.

Reverberation room, anechoic room and open valve district test site (OATS) these controlled environments are provided.Yet reverberation room has more advantage, because utilization such as the relative lower wattage power supply of 10 watts or 100 watts amplifiers just can be realized the voltage tester electric field (E-field) with every meter several hectovolts or last kilovolt.

Reverberation room is an audio amplifier, and it contains by its inner electromagnetic radiation that produces, but has got rid of the external environment condition radiation.These reverberation rooms have can the reflected-shock radiation inner surface.They are mainly used in the immunity to interference of test electronic to characteristic frequency.This reverberation room can be used for determining the frequency of (DUT) launching from " being subjected to measurement equipment ".Typical DUT comprises computer equipment, magnetic resonance imaging device, avionics, automobile and cellular phone.

Because specifying, manufacturer's testing standard uses them, so being applied in gradually of reverberation room increases.In addition, compare with other method of above-mentioned explanation, the acquisition speed relevant with reverberation room makes reverberation room be used to test preferred analytical model.Therefore, the DUT traffic carrying capacity of testing by reverberation room is increasing gradually.In order to control the traffic carrying capacity of this increase, the running of reverberation room should guarantee fast, accurate image data.

Specify or allow to use electromagnetism comparativity (EMC) testing standard of reverberation room to need reverberation room calibration factor and reverberation room uniformity data.Usually, when reverberation room is installed, gather this information, and require periodically to recalibrate and test again.Downtime occurs for fear of reverberation room, must carry out this recalibration process and test process again fast.

The conventional method of reverberation room test comprises that large-scale metal paddle or blender are to mix, to adjust or confuse the electromagnetic field in the reverberation room.Can guarantee that like this DUT is in the even field intensity.In size is the rectangular cavity of a, b and d, exist the frequency of feature mode to be: $f_{\mathrm{mnl}}=\frac{c}{2\mathrm{Pi}\sqrt{u_r{\mathrm{\ϵ}}_r}}\sqrt{{(\left(\mathrm{mPi}\right)/a)}^2+{(\left(\mathrm{nPi}\right)/b)}^2+{(\left(\mathrm{lPi}\right)/d)}^2}$

The c=light velocity wherein;

M, n and l are integer;

u _r=relative permeability;

ε _r=relative dielectric permeability;

In the recalibration process, in order in audio amplifier, to guarantee field uniformity, particularly in order to guarantee the field uniformity in 70MHz and 150MHz frequency range, tuner or frequency mixer are used to make the boundary condition maximization or on the contrary the expansion of the frequency multiplication studied are reduced to minimum level.For audio amplifier and desired low-limit frequency, tuner must be that electric current is big.By utilizing the pseudo-statistical property of each characteristic function, can realize field uniformity to the field energy level contribution of set point in the reverberation room.

As tuner, the shape that adopts is to have simple reflex face and have paddle or the effect of blade usually.Other configuration comprises Z-shaped fold plane, and it has made up with horizontal direction, vertical direction or axis order of a permutation ladder along audio amplifier.This Z-shaped fold plane is around the longitudinal axis rotation of Z-shaped sub-assembly.

Can be with tuner as mode scrambler or pattern tuner.Mode scrambler ceaselessly moves the reflecting surface of tuner.To many different rotary position of tuner with to each frequency measurement data of any given power level.This is because be mixed tuner to the influence of field by finishing the rotation of each tuner, only can obtain field uniformity in the reverberation room volume.In order to obtain optimum performance, these confuse device and must tremble little in running.Confusing the relevant typical equilibrium problem of device with machinery has promoted some exploitation electronic pattern to confuse the research (please refer to the 5th, 327, No. 091 United States Patent (USP) authorizing Loughry on July 5th, 1994) of device.Yet, confusing device relatively with machinery, it is higher that this electronics confuses the cost of device.

On the contrary, the pattern tuner is in its whole rotary courses " stepping ", and tuner stops the back in each section measuring frequency.To utilize the test process of pattern tuner in order accelerating, to require vibration minimum or stabilization time the shortest.Tuner can also be set require the frequency and the segmentation of position by it.

Usually, when low frequency was tested, the pattern tuner was even more ideal.Typical case's testing sequence comprises: tuner is adjusted to given position, and the frequency source stepping is by requiring frequency range and tuner being increased to the next position that circulation repeats.Yet, if can utilize the tuner of short stabilization time, when when single frequency is measured, this tuner can stepping by the position of all its requirements.

The running of pattern tuner requires mechanical tuner driver and tuner architecture fast, accurately, and they require gadget damping process or have naturally short stabilization time.Yet fan-shaped tuner has usually and reaches 10 seconds stabilization time, and this is unacceptable under reason amount situation aloft.Because low frequency immunity to interference testing standard is increasing gradually, so the trend of the more long wavelength's of these frequencies of requirement adaptation more large-scale tuner is to have bigger rotatablely moving, because they have increased quality.These large-scale tuners to keep closely, their stepping position of quick control proposed challenge.Although accurately stepping motor provides the driving of requirement, the gross mass of the tuner architecture of feeding back as the best of setting the motor controller amplifier is critical.

Many reverberation chamber tuners have a single supporting structure or an axis, can conductive surface be installed from supporting structure or axis radiation.(for example, please refer to the 5th, 530, No. 412 United States Patent (USP)s authorizing Goldblum on June 25th, 1996.) surface is big more, torque of the inertia that it is relevant with motion is big more.Can cause increasing stabilization time like this, promptly produce the problem of foregoing description.

In the present technique field, need to contain the tuner of large-scale conductive surface or confuse device.This tuner/confuse device also should have minimum stabilization time also should keep than low quality simultaneously.Tuner or confuse the installation of device and mechanical actuation device should be reduced to minimum with the electromagnetic radiation that is incorporated in the reverberation room that they move.

Summary of the invention

An object of the present invention is to provide a kind of device that is used for tuning reverberation room, overcomes many shortcomings of prior art.

Another object of the present invention provides a kind of energy and adapts to the low reverberation chamber tuner that reaches the frequency of electromagnetic radiation of 20MHz.The invention is characterized in to have to the juxtaposed a plurality of support units of the conductive surface of tuner.Advantage of the present invention is, the short stabilization time (rapid damping time) that the supporting tuner demonstrates.

Another purpose of the present invention provides a kind of tuner that the electromagnetic radiation of invading reverberation room can be reduced to minimum.The invention is characterized in, be used to install the bearing drive mechanism of tuner actuator shaft, it can eliminate the radio frequency from the external leaks of audio amplifier to the inside of audio amplifier, can also eliminate the radio frequency from the internal leakage of audio amplifier to the outside equally.Of the present invention another is characterised in that, uses to be arranged on the outside actuation motor that is used to drive tuner.Advantage of the present invention is that tuner can not increase the burden that stops the environment electromagnetics radiation to enter reverberation room.Another advantage of the present invention is, does not need additional filter and do not need the metal electric motor structure is compensated.

In a word, the invention provides a kind of reverberation chamber tuner, this tuner comprises a plurality of conductive surfaces that link together with Z-shaped folded configuration, can form like this: lengthening substrate, lengthening substrate have the longitudinal axis, two common and the longitudinal axis extends in parallel side and two common and vertically extending leading edges of the longitudinal axis; First planar substrates and second planar substrates are connected to each side; And the 3rd planar substrates and Siping City's face substrate, be connected to each leading edge and be connected respectively to first planar substrates and second planar substrates.

In addition, the present invention also provides a kind of being used for to reduce to minimum device along the electromagnetic radiation leakage of axle, and this device comprises: bearing housing; A plurality of thrust bearings, be connected with bearing housing and along axle with axially and put so that have two thrust bearings at least relative to each other; Journal bearing is positioned in the middle of each thrust bearing; And be used for the mutual move toward one another of mobile thrust bearing with device facing to bearing housing pushing thrust bearing.

Description of drawings

By following the embodiment of the invention shown in the drawings is elaborated, the present invention may be better understood and above-mentioned and other purpose and advantage, and accompanying drawing comprises:

Fig. 1 illustrates the elevation view of the typical module tuner of the feature according to the present invention;

Fig. 2 illustrates the elevation view of the typical module tuner of the feature according to the present invention;

Fig. 3 illustrates the cutaway view of the mounting structure of the tuner of feature according to the present invention;

Fig. 4 illustrates the elevation view of the typical module tuner of the feature according to the present invention;

Fig. 5 illustrates the elevation view of another typical module tuner of feature according to the present invention;

Fig. 6 illustrates the elevation view of another typical module tuner of feature according to the present invention;

Fig. 7 illustrates the elevation view of another typical module tuner of feature according to the present invention;

Fig. 8 illustrates the exploded view of the mounting structure of the tuner of feature according to the present invention; And

Fig. 9 illustrates the constitutional diagram of mounting structure shown in Figure 8.

Embodiment

Reverberation chamber tuner provided by the invention shows short " stabilization time ", and therefore makes that the testing time of DUT is shorter.

The present invention also provides the corresponding exterior motor installation system in inside a kind of and audio amplifier or test environment.Unique drive bearing system allows the exterior motor rotary tuner, keeps essential radio shielding specification requirement simultaneously again.Like this motor mounting can be exempted requirement to filtering and shielding reverberation room built-in motor to the outside of reverberation room.The outside motor of installing also allows more large-scale tuner, and it shows higher pattern tuning capability.

As mentioned above, tuner of the present invention and mounting structure thereof can provide the favourable border variation characteristic with respect to the width of tuner.The minimizing that also proves the testing time is the tuner function of stabilization time.People such as D.Sventanoff at Proceeding of the 1999 IEEEInternational EMC Symposium, Vol.1, pp.29-34, Seattle, WA, August2, deliver on 1999, title is: in the technical papers of " Development of High Performance Tuners forMode-Stirring and Mode-Tuning Applications ", other ins and outs and performance thereof to tuner of the present invention are illustrated, and are incorporated herein for reference.The tuner structure detail

Z-shaped folding tuner of the present invention illustrates as numbering 10 in Fig. 1.This tuner has first end 11 and second end 13.Tuner comprises the substrate 12 adjacent, conduction of a plurality of common planes, and each substrate respectively is connected to another substrate at two opposite side, has so just determined hierarchic structure or Z-shaped foldable structure.This Z-shaped foldable structure can cause forming two sides 15 that are parallel to the longitudinal axis alpha extension of tuner usually.This tuner also has two leading edges 17 of extending and comprising the limit of the first Z-shaped folding substrate that is not connected to adjacent base and last substrate perpendicular to the longitudinal axis of tuner.

Each side 15 of tuner joins with the substrate 16 normally plane, that be positioned at the side.Connect this planar substrates and be and prevent Z-shaped folding extend laterally or to intermediate compression.Can select 18 each leading edge that is connected in two leading edges 17 of tuner at the bottom of the end group, and 18 also vertical at the bottom of the end group with planar substrates 16.

According to the stable condition and the weight limits of tuner, arbitrary in 4 border substrates (promptly two end group at the bottom of 18 and two longitudinal extension substrates 16) or all can be rigidity.Usually, substrate 16 that place, longitudinal extension is opaque body and/or solid at the bottom of the end group and in the side.Like this, the reflecting surface of tuner is operable physically reflecting surface, the main Z-shaped folding longitudinal extension face of definition that limits in this surface.

There is unnumbered mode can drive tuner.For example, rotatable axle (parts 110 shown in Figure 2) can with the longitudinal axis 17 coaxial extensions of tuner.On the other hand, do not use the axle of longitudinal extension here, the end cap 18 of tuner is cured or is reinforced, to bear any turning moment that is applied thereto in order to make the tuner rotation.Can axle be connected to end cap by the countless versions fastener, include but are not limited to:: standard chuck arrangement (wherein end cap region qualification minor axis), screw and nut structure (wherein end cap 18 limits nut bore, to receive the screw end of rotating shaft) or clamping device.

The stabilization time of reinforcing the tuner acquisition in the above described manner is than low 1 to 2 order of magnitude stabilization time of current tuner acquisition.

Can also provide a kind of tuner that also has special good field uniformity ability for 80MHz or lower extremely low frequency even reinforce like this.

It is inequality to note that the continuous adjacent conducting surface engages the angle beta and the γ that form.The variation of these angles can be reduced to minimum with the redundancy of reflecting surface, therefore borderline region can be increased to maximum, perhaps sets up the more variable borderline region of the ripple that withstands shocks.

When the internal spindle of tuner overlapped with rotating shaft 17 and axle 110, the rotation of tuner can be quickened.

The advantage of basic tuner architecture shown in Figure 1 is and can adjusts with numerous ways that Fig. 4 to Fig. 7 illustrates the some of them mode.The best features that some of them are adjusted scheme is, can analyze each the vectorial relative direction perpendicular to above-mentioned each surface.In Fig. 4, last planar substrates 16 and lower plane substrate 16 are not parallel to longitudinal axis alpha, but can draw normal line vector 16nu and 16nl from it, and they and the longitudinal axis are in same level.On the other hand, be configured confusing device, so that normal line vector 16 η μ, 16 η l and axle be 17 in same level, promptly upper surface and lower surface are being turned round mutually.

Equally, to illustrate perpendicular to the longitudinal axis alpha of conducting surface 12 and vector 20 be not conplane embodiment to Fig. 5.Further may the adjustment scheme be the feature of constitutional diagram 4 and Fig. 5 or utilize on-plane surface conductive surface 12.

Fig. 6 illustrates the tuner that utilizes the continuous helical conductive surface 40 that is fastened on the axle 110 to replace conductive surface 12.Can make the spiral conductive surface of non-homogeneous pitch.Fig. 7 illustrates the Z-shaped foldable structure of the conductive surface 12 of simulation structure shown in Figure 1, but has the described conductive surface 12 that is fastened on the axle 110.The advantage of Fig. 6 and structure shown in Figure 7 is that tuner architecture has less moment of inertia.

All performances that confuse device disclosed here are all above traditional structure, because design of the present invention can suppress the undesirable characteristic pattern.The installation details of axle

The present invention also provides a kind of electromagnetic radiation that the axle that is mainly used in the tuner that drives in the reverberation room along its rotation can be immersed to reduce to minimum device.Utilization runs through axle, and this device can link together " paddle " axle 110 of tuner with the motor that is positioned at the outside.Extend on wall, top board or the top of an embodiment by audio amplifier that is designated as this device of label 100 in Fig. 6, therefore can prevent to leak electromagnetic radiation between audio amplifier inside and outside.

This device has 5 critical pieces to cooperate with rotating shaft 110.These parts are the bearing housings 121 that utilize outside end cap 122e that applies and the inner end cap 122I that applies to be connected from the side.In Fig. 3, can find another bearing housing.Bearing housing is suitable for holding the thrust bearing 118 that a pair of its shape is similar to packing ring.The centre of thrust bearing is the journal bearing 120 that is similar to butt cylinder or ring.

When thrust bearing being exerted pressure, utilize bearing housing to regulate to the radio frequency sealing of axle by outside end cap 122e.According to this mechanical pressure, the face 119 towards the centre of thrust bearing 118 is realized closely being electrically connected with the surface 125 of the aspect-oriented of bearing housing 121, therefore realizes the RF sealing.

Motor 112 by the outside that itself is positioned at reverberation room inside 111 comes driving shaft 110.That a zone of axle is contained is radial oriented, around the annular section 114 that extends, to limit the surface 116 or the shoulder of aspect-oriented.Therefore, can arrange thrust bearing relative to each other.

The centre of thrust bearing is a journal bearing 120.The length of journal bearing is long to allowing mutually the moderate displacement of in opposite directions thrust bearing 118 or mobile.

The mechanical pressure that utilization is applied thereto can make thrust bearing realize moderate moving.A kind of device that pressure is applied to thrust bearing is a pair of end cap 122i, the 122e by relative arrangement.Move outside end cap 122e by bolt 124e being screwed into the screw hole 126e that is located on the bearing housing.

Another part of the bearing housing relative fully with the first screw hole 126I forms the second screw hole 126e, slidably to be screwed into the second bolt 124i.Be exactly that this bolt is fixed to bearing housing 121 with inner end cap 122i.In case be fixed to bearing housing 121, inner end cap 122i just is fixed on the there, and by further tightening the second bolt 124i, significantly moving just can not appear in this end cap.Therefore, by tightening or unclamping the bolt 124e that outside end cap 122e is connected to bearing housing 121, can realize the mechanical pressure of thrust bearing 118 is regulated.

Utilize a plurality of hold-down rings 136 and hold-down ring bolt 138, bearing housing 121 can be remained on opening 140 positions in the audio amplifier surface 128.

In order to guarantee thrust bearing to be had enough pressure in suitable direction with respect to audio amplifier wall 128, the part 123 of end cap can be set like this, promptly can hold integral thickness less than thrust bearing.In this set, tighten or suitable mobile end cap can guarantee fully being electrically connected between thrust bearing and end cap.

Can select end cap 122i, 122e to have and limit the zone that radial distance only connects the endless groove 134 of the nested point of bearing.These endless grooves are suitable for holding microwave absorbing material, with the further radio shielding effect that strengthens the axle mounting structure.

Can regulate thrust bearing, to eliminate interested frequency.Usually the moment between 2 and 50 Foot-Pounds is enough.

Bearing 118,120 comprises the oil-containing conductive substrates.The copper alloy that typical oil-containing conductive substrates is an oil-containing.Commercial oil-containing copper alloy has Oilite ^TMOr Bost-Bronze ^TM, wherein the latter can pass through Boston Gear, and ofBoston MA obtains.

Another Bearing assembly that describes in detail is appointed as label 200 in Fig. 8.Because there are a plurality of journal bearings, so this second Bearing assembly has improved the stability of axle.Specifically, substrate 224 and end cap 222 comprise the journal bearing 245 that is pressed into.In the position of two separation, these bearings are supporting axle 244.What this design was provided with increases load supporting (i.e. the load bearing-surface of expanding more) apart from permission.

The critical piece of Bearing assembly runs through axle 244 with the rotation of extending along the longitudinal axis of tuner works in coordination.These main Bearing assembly parts comprise: substrate 224 is removably mounted on the wall 250 of test cabinet; Locking hub 221 is releasably attached to substrate 224; And end cap 222, be releasably attached to the locking hub.Substrate 224, end cap 222 and locking hub 221 are being pressed the thrust bearing 218 that is positioned at locking hub both sides from both direction, seal to help that the axle 244 facing to Bearing assembly is carried out radio frequency, thereby prevent to leak radio frequency along axle 244.

By substrate 224, tuner apparatus is fixed on the wall 250 of test cabinet.In a kind of fixed solution, substrate 224 zones are limited to transverse holes 223 on the axle of the hole of same size on the wall therewith aiming at, and can receive bolt 255 or other fixture like this, are fixed on the wall to guarantee substrate.

Locking hub 221 and end cap 222 are loop configuration usually.End cap 222 is coaxial with axle and be positioned at the end that wall to substrate is connected.Locking hub 221 limits the locking hub area, is used for determining to receive the hole of fixture.

The surface 240 towards central authorities of substrate 224 connects first thrust bearing 218 concentric and coaxial with axle 244 with substrate.Second thrust bearing 219 that connects same structure towards the surface 241 of central authorities of end cap 222.

End cap 222 by and put at end cap and be connected with spools 244 with journal bearing 245 between the axle.The similar of journal bearing is in the cylinder or the ring of butt.Wherein each journal bearing connects and runs through axle 244.The length of journal bearing is enough to allow them to act on the axle 244 and can plays stabilization to rotating shaft.

The notable feature of Bearing assembly is that it can carry out adjustable, transformable radio frequency sealing to the axle facing to bearing housing.By thrust bearing is axially exerted pressure, can realize the radio frequency sealing.Specifically, when exerting pressure, can realize the radio frequency sealing by the first fastening fixture 225 and 229 pairs of thrust bearings 218 of the second fastening fixture.

Fixture 225 can be received slidably by the hole around end cap annular array, moulding on the zone of end cap 222, therefore allows fixture to pass with the screw hole 235 that locks coaxial setting on the hub 221 and links together.

Form 226, the second holes 226, second hole on another part of substrate 224 in radially being arranged on fastener hole 223 and be suitable for receiving slidably the second fastening fixture 229.Bolt 229 relies on shoulder 233 to arrive resting position, and shoulder 233 limits the edge of the transverse holes 237 that is limited by the fringe region that locks hub.Transverse holes 235 and second hole, 226 coaxial alignments.In this structure, fixture 229 removably will lock hub 221 and be installed to substrate 224, and can produce a kind of interference fit so that thrust bearing 218 is locked in this process.Utilization is screwed into the bolt 225 in hole 235, and end cap is fixed to the locking hub.In case be fixed to substrate, the locking hub just stops.Equally, in case be fixed to the locking hub, sold inside the country by the groove that cooperates with the locking hub, just the end cap adjustable ground can be fixed to the appropriate location.In fact, cooperates with the scalable of locking between the hub at end cap and can realize that radio frequency seals mutability and adjusts to Bearing assembly.Usually, end cap leans on to such an extent that the locking hub is tight more, and radio frequency seals just well more.Yet being accompanied by to tighten gradually just needs bigger revolving force to come driving shaft 244.

That axle 244 centre position is contained is radial oriented, around extending annular region 214, to limit the surface 216 or the shoulder of aspect-oriented.Thrust bearing 218 is connected the surface 216 of each aspect-oriented with 219.Therefore, annular region is positioned at the centre of thrust bearing.

In a word, axially applying mechanical pressure by fastening end cap 222 can cause the surface 216 connection thrust bearings 218,219 of the aspect-oriented of annular region to be electrically connected with realization.This connection can realize the radio frequency sealing.As mentioned above, increase axial compressive force and can strengthen the radio frequency sealing.

Axle 109 links to each other with motor 112, and motor 112 is in the outside of reverberation room inside 111, and does not belong to the part of above-mentioned Bearing assembly.

When the free pulley (not shown) that utilizes wall and/or top to install support the end 117 of tuner the time, can strengthen verticity.

Although the details with reference to illustrated embodiment describes the present invention, these details are not the restrictions of the scope of the invention that claims are limited.

Claims (30)

1. reverberation chamber tuner comprises:

A) a plurality of conductive surfaces are connected to each other together, form Z-shaped foldable structure, and this structure has the longitudinal axis, two side and two leading edges perpendicular to longitudinal axis extension that are parallel to longitudinal axis extension;

B) substrate of longitudinal extension links to each other with each side; And

C) substrate of non-longitudinal extension links to each other with each leading edge and links to each other with second planar substrates with first planar substrates respectively.

2. tuner according to claim 1, wherein said the 3rd substrate and vertical respectively described first planar substrates and second planar substrates of being connected to of the 4th substrate.

3. tuner according to claim 1, wherein at least the first substrate and second substrate is a rigidity.

4. tuner according to claim 1, wherein at least the three substrate and the 4th substrate is a rigidity.

5. tuner according to claim 1 wherein is provided with Z-shaped foldable structure like this, and the setting angle between promptly any two adjacently situated surfaces is different with the setting angle between any other adjacently situated surfaces.

6. tuner according to claim 1, this tuner are suitable for receiving the axle coaxial with the longitudinal axis, and wherein said axle is by the 3rd planar substrates and Siping City's face substrate horizontal expansion.

7. tuner according to claim 6, its axis passes the 3rd substrate, becomes about an angle of 90 degrees to extend with plane by the 3rd substrate definition, and axle passes the 4th substrate, becomes about an angle of 90 degrees to extend with plane by Siping City's face substrate definition.

8. tuner according to claim 1, wherein first substrate, second substrate, the 3rd substrate and the 4th substrate can be penetrated by electromagnetic radiation.

9. one kind is used for and will reduces to minimum device along the electromagnetic radiation leakage of axle, and this device comprises:

A) bearing housing;

B) a plurality of thrust bearings, be connected with bearing housing and along axle with axially and put so that have two thrust bearings at least relative to each other;

C) journal bearing is positioned in the middle of each thrust bearing; And

D) be used for the mutual move toward one another of mobile thrust bearing, thrust bearing is pressed to the device of bearing housing.

10. device according to claim 9, wherein thrust bearing and journal bearing comprise the oil-containing electric conducting material.

11. device according to claim 9, wherein thrust bearing and journal bearing comprise the oil-containing copper alloy.

12. device according to claim 9, the device that wherein is used for mobile thrust bearing comprises the device of thrust bearing suitably being exerted pressure along the longitudinal axis of axle.

13. device according to claim 12 wherein can be regulated pressure, to turn off the certain electric magnet rate.

14. comprising, device according to claim 9, the device that wherein is used for mobile thrust bearing be used for device that the thrust bearing side is connected with suitable directed rigid face.

15. device according to claim 14, wherein said rigid face is suitable for receiving microwave absorber.

16. device according to claim 15, wherein microwave absorber connection bearing case.

17. device according to claim 9, this device further comprise the locking hub face between described thrust bearing.

18. device according to claim 17, wherein thrust bearing is exerted pressure to the locking hub face changeably.

19. a reverberation chamber tuner comprises a plurality ofly linking to each other with the longitudinal axis and being connected to each other, and forms the conductive surface of the Z-shaped foldable structure with longitudinal axis.

20. a reverberation chamber tuner comprises with the longitudinal axis linking to each other, and forms the spiral conductive surface of the helical structure with longitudinal axis.

21. a reverberation chamber tuner sub-assembly comprises:

A) a plurality of conductive surfaces are connected to each other, and form Z-shaped structure, and this Z-shaped structure has the longitudinal axis, two side and two leading edges perpendicular to longitudinal axis extension that are parallel to longitudinal axis extension;

B) first plane surface and second plane surface link to each other with each side;

C) the 3rd plane surface and face surface, Siping City are connected to each leading edge and are connected respectively to first plane surface and second plane surface;

D) axle is coaxial with the longitudinal axis, and wherein said axle is by the 3rd plane surface and the surface horizontal expansion of Siping City's face; And

E) be used to rotate described device, comprise and to reduce to minimum device along the electromagnetic radiation leakage of described axle.

22. tuner sub-assembly according to claim 21 wherein is used for comprising reducing to minimum device along the electromagnetic radiation leakage of axle:

A) bearing housing;

B) a plurality of thrust bearings, be connected with bearing housing and along axle with axially and put so that have two thrust bearings at least relative to each other; And

C) be used for the mutual move toward one another of mobile thrust bearing thrust bearing is pressed to the device of bearing housing.

23. device according to claim 22, wherein thrust bearing comprises the oil-containing electric conducting material.

24. device according to claim 22, wherein thrust bearing comprises the oil-containing copper alloy.

25. device according to claim 22, the device that wherein is used for mobile thrust bearing comprises the device that thrust bearing is applied suitable pressure along the longitudinal axis of axle.

26. device according to claim 25 wherein can be regulated pressure to turn off the certain electric magnet rate.

27. comprising, device according to claim 22, the device that wherein is used for mobile thrust bearing be used for the device that the side with thrust bearing is connected with suitable directed rigid face.

28. device according to claim 27, wherein said rigid face is suitable for receiving microwave absorber.

29. device according to claim 28, wherein microwave absorber links to each other with bearing housing.

30. require described device according to aforesaid right, comprise the middle locking hub that described thrust shaft pressure-bearing.

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