CN105116234A - Multi-frequency band measurement device and system of complex permittivity of microwave dielectric material - Google Patents
Multi-frequency band measurement device and system of complex permittivity of microwave dielectric material Download PDFInfo
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- CN105116234A CN105116234A CN201510564399.0A CN201510564399A CN105116234A CN 105116234 A CN105116234 A CN 105116234A CN 201510564399 A CN201510564399 A CN 201510564399A CN 105116234 A CN105116234 A CN 105116234A
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Abstract
The invention discloses a multi-frequency band measurement device and system of the complex permittivity of a microwave dielectric material and belongs to the microwave test field. The multi-frequency band measurement device comprises a base; a fixed bracket and an adjustable bracket are arranged on the base; the fixed bracket is provided with a first detachable metal resonant cavity; the adjustable bracket is provided with a second detachable metal resonant cavity; and the first metal resonant cavity and the second metal resonant cavity are arranged oppositely. With the multi-frequency band measurement device of the complex permittivity of the microwave dielectric material of the invention adopted, position fine adjustment of the resonant cavity at the fixed end and the resonant cavity at the movable end can be both realized at a horizontal direction and a vertical direction which are vertical to an axial direction; the resonant cavity assemblies of the multi-frequency band measurement device of the invention can be disassembled easily, and a plurality of resonant cavity assemblies of which the cavity portions are differently sized can be installed, and therefore, the measurement of the complex permittivity of a multi-frequency band material can be realized. The multi-frequency band measurement device of the invention has the advantages of simple layout and easiness in operation.
Description
Technical field
The present invention relates to microwave test field, refer to a kind of multi-frequency range measurement Apparatus and system of complex permittivity of the microwave dielectric material based on Metal cavity technology especially.
Background technology
In recent years, the requirement of the high-tech area radio frequency microwave devices such as Aero-Space, communication and infotech is more and more higher, makes frequency microwave material also more and more important in these fields.When applying various frequency microwave material, first the complex permittivity under its microwave frequency must be understood by test, namely its relative dielectric constant and dielectric loss angle tangent two parameters.In various frequency microwave device, the field of frequency microwave dielectric material widely applied by the multiplayer microwave such as stacked antenna, wave filter device, microwave and millimetre integrated circuit substrate etc., its research and design all need the multiple dielectric parameter of material accurately, for with middle low-loss material, the measurement of its complex permittivity is particularly important.
The main method of the current complex permittivity that can be used for measuring microwave dielectric material both at home and abroad has: resonance method, transmission method, transmission-wire terminal method, free-space Method etc., wherein resonance method is that dielectric substance dielectric parameter measurement uses method the most general, and its accuracy of measurement is also the highest.By investigating to domestic and international correlation meter, the measurement mechanism at present based on Metal cavity technology mainly contains two kinds of shaping schemes:
Scheme one: according to the correlation meter of IEC62562-2010 development, this device is two parts resonator cavity is that vertical direction is placed, wherein the latter half resonator cavity is fixed, the first half resonator cavity is then fixed on one piece of sheet metal moving up and down, and sheet metal is then supported by four upright root posts and realizes moving up and down.But after repeatedly using, easily there is the deviation in horizontal or vertical direction, namely fix between resonator cavity part and movable resonator cavity part and produce relative displacement deviation, and this deviation cannot carry out simple modifications, increase detection difficulty, and resonator cavity is single cavity, single frequency band can only be used for (as TE
011resonance frequency is 10GHz) material complex-permittivity measurement.
Scheme two: Agilent company provides a kind of similar measurement mechanism (85072A), and this device is that two parts resonator cavity is placed in horizontal direction, and wherein left-half resonator cavity is fixed, and right half part resonator cavity can realize opening and closing left and right and move.Although the some drawbacks of program customer service " scheme one ", if the anchor portion of fixing resonator cavity part is by the guide rail perpendicular to resonator cavity axis, achieve the adjustment of resonator cavity in axis.But this device can only realize the fine position of the horizontal twocouese perpendicular to resonator cavity axis, and vertical direction is difficult to regulate; And layout is crowded, use inconvenience; The rotation reference of resonator cavity, at edge, easily causes turned position deviation; This device is also single cavity, can only be used for 10GHz (TE
011resonance frequency) following material complex-permittivity measurement.
Therefore, be necessary to provide one can realize vertical direction simultaneously, horizontal direction regulates, be easy to operate the measurement mechanism that also can carry out the material complex-permittivity measurement of multiband.
Summary of the invention
The invention provides one and can realize vertical direction, horizontal direction adjustment simultaneously, be easy to operate the multi-frequency range measurement device that also can carry out the complex permittivity of the microwave dielectric material of the material complex-permittivity measurement of multiband.
For solving the problems of the technologies described above, the invention provides technical scheme as follows:
On the one hand, a kind of multi-frequency range measurement device of complex permittivity of microwave dielectric material is provided, comprise base, described base is provided with fixed support and adjustable support, described fixed support is provided with dismountable first Metal cavity, described adjustable support is provided with dismountable second Metal cavity, described first Metal cavity and the second Metal cavity are oppositely arranged, wherein:
Described fixed support comprises described fixed support main body, described fixed support main body lower end is arranged on described base, the inner side of described fixed support main body is provided with the Baltimore groove vertically extended, glide base is provided with in described Baltimore groove, described glide base is provided with described first Metal cavity, the top of described Baltimore groove is provided with the position adjustments bolt of the vertical position for regulating described glide base, and the arranged outside of described fixed support main body has the location fastening bolt of the vertical position for fixing described glide base;
Described adjustable support comprises the axial position regulating device of slide axially support and the axial location for the support that slides axially described in regulating, described base is provided with the rail plate matched with the described support that slides axially, described in the slide axially inner side of support be provided with described second Metal cavity.
Further, the position corresponding with the corner of described glide base, the outside of described fixed support main body is provided with the balance adjustment bolt for carrying out angular adjustment to all directions of described glide base vertical axial, described balance adjustment bolt is arranged with spring, and described Baltimore groove is T-slot or dovetail groove.
Further, described glide base is provided with the first resonator cavity pedestal for described first Metal cavity of dismountable installation.
Further, slide axially described in the second resonator cavity pedestal support is provided with for described second Metal cavity of dismountable installation.
Further, the inner side of the described support that slides axially is provided with the groove that the horizontal direction along vertical axial extends, described second resonator cavity pedestal is arranged in described groove, the two ends of described groove are provided with the location fastening bolt of the position adjustments bolt of the horizontal direction position along vertical axial for regulating described second resonator cavity pedestal and the horizontal direction position for fixing described second resonator cavity pedestal, and described groove is T-slot or dovetail groove.
Preferably, described axial position regulating device comprises the mircrometer gauge fixed mount be arranged on described base and the micrometer caliper be fixed on described mircrometer gauge fixed mount, the end of described micrometer caliper is provided with heading, and slide axially described in described micrometer caliper is promoted by described heading support.
Further, described first Metal cavity and the second Metal cavity are provided with the partner probe micro-adjusting mechanism stretching into the length of resonator cavity for controlling probe, described partner probe micro-adjusting mechanism adopts turbine and worm structural design, described partner probe micro-adjusting mechanism is provided with the cable duct for installing probe cable, described cable duct is covered with cable cover.
Preferably, the corner, bottom surface of described first Metal cavity and the second Metal cavity is provided with for fixing screw, and diagonal position is provided with a pair register pin nail.
Preferably, the surrounding of described base is provided with the screw for mounting foot, the centerline of described base offers the some Long Circle through holes for installing described rail plate, be separated with tommy hole between described Long Circle through hole, described base is provided with for locating described support bracket fastened dowel hole.
On the other hand, provide a kind of multi-frequency range measurement system of complex permittivity of microwave dielectric material, comprise vector network analyzer, described vector network analyzer is connected with the multi-frequency range measurement device of the complex permittivity of above-mentioned microwave dielectric material.
The present invention has following beneficial effect:
1) the multi-frequency range measurement device of the complex permittivity of microwave dielectric material of the present invention, can realize the fine position of stiff end resonator cavity and movable terminal resonator cavity vertical direction, horizontal axis;
2) Metal cavity of the present invention is easy to dismounting, can install many groups Metal cavity that cavity portion size is different, realize the material complex-permittivity measurement of multiband;
3) topology layout of the present invention is simple and easy, is easy to operation.
Accompanying drawing explanation
Fig. 1 is the composition schematic diagram of multi-frequency range measurement device of the present invention;
Fig. 2 be multi-frequency range measurement device of the present invention without vertical view support bracket fastened during cover plate;
Fig. 3 is the support bracket fastened side view of multi-frequency range measurement device of the present invention;
Fig. 4 is the side view without the support that slides axially during cover plate of multi-frequency range measurement device of the present invention;
Fig. 5 is the side view of the adjustable support of multi-frequency range measurement device of the present invention;
Fig. 6 is the stereographic map of the Metal cavity of multi-frequency range measurement device of the present invention;
Fig. 7 is the side view of the partner probe micro-adjusting mechanism of multi-frequency range measurement device of the present invention.
Embodiment
For making the technical problem to be solved in the present invention, technical scheme and advantage clearly, be described in detail below in conjunction with the accompanying drawings and the specific embodiments.
On the one hand, the invention provides a kind of multi-frequency range measurement device of complex permittivity of microwave dielectric material, as shown in Figure 1, comprise base 1, base 1 is provided with fixed support 2 and adjustable support 3, fixed support 2 is provided with dismountable first Metal cavity 4, adjustable support 3 is provided with dismountable second Metal cavity 5, first Metal cavity 4 and the second Metal cavity 5 are oppositely arranged, wherein:
Fixed support 2 comprises fixed support main body 201, fixed support main body 201 lower end is arranged on base 1, the inner side of fixed support main body 201 is provided with the Baltimore groove 202 (as shown in Figure 2) vertically extended, glide base 15 is provided with in Baltimore groove 202 (as shown in Figure 2), glide base 15 is provided with the first Metal cavity 4, the top of Baltimore groove 202 is provided with the position adjustments bolt 9 of the vertical position for regulating glide base 15, and the arranged outside of fixed support main body 201 has the location fastening bolt 11 of the vertical position for fixing glide base 15;
Adjustable support 3 comprises the support 301 and for the axial position regulating device 302 of regulating shaft to the axial location of sliding support 301 of sliding axially, base 1 is provided with the rail plate 21 (as shown in Figure 4) matched with the support 301 that slides axially, the inner side of the support 301 that slides axially is provided with the second Metal cavity 5.
Position adjustments bolt 9 can be regulated by height glide base 15 being carried out to vertical direction, glide base can be moved up and down, glide base can arrange threaded hole, position adjustments bolt 9 is by tightening or unscrewing the vertical direction position regulating glide base, also can not on glide base providing holes, can install elastic device (as other resilient materials such as springs) in the bottom of Baltimore groove 202, position adjustments bolt 9 is by tightening or unscrewing the vertical direction position regulating glide base; The rail plate of support of sliding axially can be arranged on base, also can be arranged in base (arranging with T-shape chute); Slide axially support when horizontal axis slides, needs to regulate and fix, above-mentioned regulating device can, after the adjustment of the position of horizontal axis, be fastened by bolts on slide rail; The axis of middle finger of the present invention is the direction (i.e. the left and right directions of surface level) that two Metal cavity alignment rear center axles connect.
When complex permittivity is tested, sample is placed between first, second Metal cavity, regulate the position of glide base (i.e. stiff end resonator cavity) vertical direction, the position of adjustable support (i.e. movable terminal resonator cavity) horizontal axis on fixed support, by the fine setting of vertical direction, horizontal axis, first, second Metal cavity held tight sample is measured; After vertical direction is fixing, can measure by regulating the position of adjustable support (i.e. movable terminal resonator cavity) horizontal axis to change sample.
The multi-frequency range measurement device of the complex permittivity of microwave dielectric material of the present invention, can realize the fine position of stiff end resonator cavity and movable terminal resonator cavity vertical direction, horizontal axis; Metal cavity of the present invention is easy to dismounting, can install many groups Metal cavity that cavity portion size is different, realize the material complex-permittivity measurement of multiband; Topology layout of the present invention is simple and easy, is easy to operation.
Further, as shown in Figure 2 and Figure 3, the position corresponding with the corner of glide base 15, the outside of fixed support main body 201 can be provided with the balance adjustment bolt 13 for carrying out angular adjustment to all directions of glide base 15 vertical axial, balance adjustment bolt 13 is arranged with spring 14, Baltimore groove 202 is T-slot or dovetail groove.
Certain space is had between glide base and fixed support main body, glide base is set to threaded hole, by two, fastening upper end balance adjustment bolt, glide base " new line " a little can be made, namely in the process of two the balance adjustment bolts in upper end, due to the effect of spring, the upper end of glide base is tightened up and close fixed support main body, the lower end of glide base is then opened and away from fixed support main body, thus regulate the angular adjustment of all directions of vertical axial, by regulating the tightness of four balancing bolt, thus multi-faceted angular adjustment is carried out to resonator cavity, ensure the accuracy of measuring.
As a modification of the present invention, as shown in Figure 2 and Figure 3, glide base 15 is provided with the first resonator cavity pedestal 8 for dismountable installation first Metal cavity 4.First resonance pedestal is set between glide base and the first Metal cavity, the dismounting of the first Metal cavity and easier for installation can be made.Above-mentioned balance adjustment bolt 13 can pass glide base and the first resonance pedestal, unthreaded hole is set to by glide base, first resonance pedestal is set to threaded hole, between glide base and the first resonance pedestal, using the center of the first resonance pedestal as reference position, reference position can connect with mobilizable web member 151, make the angular adjustment of the first resonance pedestal more accurate and convenient, with above-mentioned balance adjustment bolt 13 through fixed support main body or not through fixed support main body, by regulating the tightness of four balancing bolt 13, thus multi-angle adjustment is carried out to resonator cavity, ensure the accuracy of measuring.
Preferably, as shown in Figure 1, Figure 4, Figure 5, slide axially the second resonator cavity pedestal 20 that support 301 can be provided with for dismountable installation second Metal cavity 5.Slide axially and support installs the second resonance pedestal the second Metal cavity can be made for convenience detach and install.
In order to make Metal cavity can regulating along in the horizontal direction of vertical axial, as shown in Figure 4, Figure 5, the slide axially inner side of support 301 can be provided with the groove 17 that the horizontal direction along vertical axial extends, second resonator cavity pedestal 20 can be arranged in groove 17, the two ends of groove 17 are provided with for regulating the position adjustments bolt 19 of the horizontal direction position along vertical axial of the second resonator cavity pedestal 20 and the location fastening bolt 18 for the horizontal direction position of fixing the second resonator cavity pedestal 20, and groove 17 is T-slot or dovetail groove.
Above-mentioned groove 17 can communicate at two ends, and two ends arrange cover plate, and also can communicate one end, one end arranges cover plate, and the other end arranges corresponding position adjustments bolt 19 and fastening bolt 18.In use, by propelling or the release of position adjustments bolt 19, the second resonator cavity pedestal is made to realize moving (namely as shown in Figure 1 along the horizontal direction of vertical axial, moving forward and backward relative to paper), after adjusting position is fixing, fixed by fastening bolt 18, thus make the fine setting of Metal cavity more accurate.
Regulate to accurately control the direction of Metal cavity in horizontal axis, as shown in Figure 4, Figure 5, axial position regulating device 3 can comprise the mircrometer gauge fixed mount 16 be arranged on base 1 and the micrometer caliper 23 be fixed on mircrometer gauge fixed mount 16, the end of micrometer caliper 23 is provided with heading 22, and micrometer caliper 23 passes through heading 22 impeller-hub to sliding support 301.
Heading 22 is promoted by screw rod by micrometer caliper 23, thus the support 301 that makes to slide axially advances toward horizontal direction, at mircrometer gauge fixed mount 16 with slide axially between support 301 and arrange spring 303, when adjusting back axial screw mircrometer gauge 23, the corresponding readjustment of support 301 that slides axially can be made.Above-mentioned micrometer caliper is market salable item, can realize precise fine-adjustment by micrometer caliper, and can record the adjusting position of the Metal cavity of certain band frequency, and convenient test next time regulates fast and effectively.
In order to ensure the measurement accuracy of Metal cavity, as shown in Figure 1, Figure 7 shows, first Metal cavity 8 and the second Metal cavity 20 all can be provided with the partner probe micro-adjusting mechanism 6 stretching into the length of resonator cavity for controlling probe, partner probe micro-adjusting mechanism 6 adopts turbine and worm structural design, partner probe micro-adjusting mechanism 6 being provided with the cable duct 30 for installing probe cable, cable duct 30 being covered with cable cover 28.Cable cover 28 is fixed on the notch of cable duct 30 by bolt 29.
First, second Metal cavity is arranged partner probe micro-adjusting mechanism, the length of probe that can be coaxial to two of stretching into resonator cavity is finely tuned, and realizes weak coupling excitation, thus completes measurement; And use cable duct that probe cable is installed, fix with cover plate, to probe cable excessive compression, thus can not farthest reduce the impact on probe cable itself and microwave transmission signal, improve test accuracy and consistance.
Conveniently dismantle and install Metal cavity, as shown in Figure 6, the corner, bottom surface of the first Metal cavity 8 and the second Metal cavity 20 can be provided with for fixing screw 26, and diagonal position can be provided with a pair register pin nail 27.Above-mentioned arranging of register pin nail facilitates location and installation, and screw arranges for convenience detach and installs Metal cavity.
First Metal cavity 8 and the second Metal cavity 20 are provided with two screws 25 (non through hole) for installing supporting fine tuning structure perpendicular to the side of bottom surface, and are provided with the probe through hole stretched into for probe accordingly in this side; The internal diameter size of Metal cavity and the degree of depth can make as required, the Demountable metallic resonator cavity that the present invention proposes, namely can the Metal cavity of simultaneously processing and fabricating many groups different inner diameters size and the degree of depth, carry out installations replacing as required, thus realize the measurement of multiband.
Conveniently install, the surrounding of base 1 can be provided with the screw 102 for mounting foot 101, the centerline of base 1 offers the some Long Circle through holes (not marking) for installing rail plate 21, be separated with tommy hole 103 between Long Circle through hole, base 1 is provided with the dowel hole 103 ' for locating fixed support 2.Base arranges register pin nail and dowel hole conveniently can install rail plate or fixed support main body.
Again, provide a kind of multi-frequency range measurement system of complex permittivity of microwave dielectric material, comprise vector network analyzer, described vector network analyzer is connected with the multi-frequency range measurement device of the complex permittivity of above-mentioned microwave dielectric material.
When complex permittivity is tested, sample is placed in first, between second Metal cavity, regulate the vertical direction position of glide base (i.e. stiff end resonator cavity) on fixed support, the position of adjustable support (i.e. movable terminal resonator cavity) horizontal axis, and by other means (as the balance adjustment bolt on glide base, position adjustments bolt etc. on second resonance pedestal) carry out the adjustment in multiple orientation, make first, second Metal cavity can be measured by held tight sample, same group of Metal cavity is after adjustment, when changing sample, just can realize changing by adjustable screw mircrometer gauge (i.e. horizontal axis), do not need repeatedly to regulate other micromatic settings, only need after there is position deviation in long-time use, carry out again finely tuning, and by improving the reference position of probe regulating device and the first resonance pedestal, further ensure measuring accuracy, and by improving resonator cavity pedestal, making the installation of many group resonator cavitys compatible, realizing the material complex-permittivity measurement of multiband by changing internal diameter size many groups Metal cavity different with the degree of depth.
The multi-frequency range measurement device of the complex permittivity of microwave dielectric material of the present invention, can realize the fine position of stiff end resonator cavity and movable terminal resonator cavity vertical direction, horizontal axis; Metal cavity of the present invention is easy to dismounting, can install many groups Metal cavity that cavity portion size is different, realize the material complex-permittivity measurement of multiband; Topology layout of the present invention is simple and easy, is easy to operation.
The above is the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the prerequisite not departing from principle of the present invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (10)
1. the multi-frequency range measurement device of the complex permittivity of a microwave dielectric material, it is characterized in that, comprise base, described base is provided with fixed support and adjustable support, described fixed support is provided with dismountable first Metal cavity, described adjustable support is provided with dismountable second Metal cavity, described first Metal cavity and the second Metal cavity are oppositely arranged, wherein:
Described fixed support comprises described fixed support main body, described fixed support main body lower end is arranged on described base, the inner side of described fixed support main body is provided with the Baltimore groove vertically extended, glide base is provided with in described Baltimore groove, described glide base is provided with described first Metal cavity, the top of described Baltimore groove is provided with the position adjustments bolt of the vertical position for regulating described glide base, and the arranged outside of described fixed support main body has the location fastening bolt of the vertical position for fixing described glide base;
Described adjustable support comprises the axial position regulating device of slide axially support and the axial location for the support that slides axially described in regulating, described base is provided with the rail plate matched with the described support that slides axially, described in the slide axially inner side of support be provided with described second Metal cavity.
2. the multi-frequency range measurement device of the complex permittivity of microwave dielectric material according to claim 1, it is characterized in that, the position corresponding with the corner of described glide base, the outside of described fixed support main body is provided with the balance adjustment bolt for carrying out angular adjustment to all directions of described glide base vertical axial, described balance adjustment bolt is arranged with spring, and described Baltimore groove is T-slot or dovetail groove.
3. the multi-frequency range measurement device of the complex permittivity of microwave dielectric material according to claim 2, is characterized in that, described glide base is provided with the first resonator cavity pedestal for described first Metal cavity of dismountable installation.
4. the multi-frequency range measurement device of the complex permittivity of microwave dielectric material according to claim 1, is characterized in that, described in slide axially the second resonator cavity pedestal support is provided with for described second Metal cavity of dismountable installation.
5. the multi-frequency range measurement device of the complex permittivity of microwave dielectric material according to claim 4, it is characterized in that, the inner side of the described support that slides axially is provided with the groove that the horizontal direction along vertical axial extends, described second resonator cavity pedestal is arranged in described groove, the two ends of described groove are provided with the location fastening bolt of the position adjustments bolt of the horizontal direction position along vertical axial for regulating described second resonator cavity pedestal and the horizontal direction position for fixing described second resonator cavity pedestal, and described groove is T-slot or dovetail groove.
6. the multi-frequency range measurement device of the complex permittivity of microwave dielectric material according to claim 5, it is characterized in that, described axial position regulating device comprises the mircrometer gauge fixed mount be arranged on described base and the micrometer caliper be fixed on described mircrometer gauge fixed mount, the end of described micrometer caliper is provided with heading, and slide axially described in described micrometer caliper is promoted by described heading support.
7. according to the multi-frequency range measurement device of the complex permittivity of described microwave dielectric material arbitrary in claim 1-6, it is characterized in that, described first Metal cavity and the second Metal cavity are provided with the partner probe micro-adjusting mechanism stretching into the length of resonator cavity for controlling probe, described partner probe micro-adjusting mechanism adopts turbine and worm structural design, described partner probe micro-adjusting mechanism is provided with the cable duct for installing probe cable, described cable duct is covered with cable cover.
8. the multi-frequency range measurement device of the complex permittivity of microwave dielectric material according to claim 7, it is characterized in that, the corner, bottom surface of described first Metal cavity and the second Metal cavity is provided with for fixing screw, and diagonal position is provided with a pair register pin nail.
9. the multi-frequency range measurement device of the complex permittivity of microwave dielectric material according to claim 7, it is characterized in that, the surrounding of described base is provided with the screw for mounting foot, the centerline of described base offers the some Long Circle through holes for installing described rail plate, be separated with tommy hole between described Long Circle through hole, described base is provided with for locating described support bracket fastened dowel hole.
10. the multi-frequency range measurement system of the complex permittivity of a microwave dielectric material, it is characterized in that, comprise vector network analyzer, described vector network analyzer is connected with the multi-frequency range measurement device of the complex permittivity of arbitrary described microwave dielectric material in claim 1-9.
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| CN107132420A (en) * | 2017-04-06 | 2017-09-05 | 中国电子技术标准化研究院 | The microwave complex dielectric constant test system and method for low loss dielectric powder or liquid |
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| CN107132420A (en) * | 2017-04-06 | 2017-09-05 | 中国电子技术标准化研究院 | The microwave complex dielectric constant test system and method for low loss dielectric powder or liquid |
| CN107132420B (en) * | 2017-04-06 | 2019-07-12 | 中国电子技术标准化研究院 | The microwave complex dielectric constant test macro and method of low loss dielectric powder or liquid |
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| CN109596898A (en) * | 2018-12-18 | 2019-04-09 | 北京无线电计量测试研究所 | A kind of probe support device and the room concentric tapered TEM |
| CN111351808A (en) * | 2020-03-19 | 2020-06-30 | 绵阳人众仁科技有限公司 | Micron-sized adjusting device for film detection |
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