CN101105512A - Circular waveguide standing wave measurement device for eight mm waveband dielectric measurement - Google Patents
Circular waveguide standing wave measurement device for eight mm waveband dielectric measurement Download PDFInfo
- Publication number
- CN101105512A CN101105512A CNA2007100677394A CN200710067739A CN101105512A CN 101105512 A CN101105512 A CN 101105512A CN A2007100677394 A CNA2007100677394 A CN A2007100677394A CN 200710067739 A CN200710067739 A CN 200710067739A CN 101105512 A CN101105512 A CN 101105512A
- Authority
- CN
- China
- Prior art keywords
- circular waveguide
- waveguide
- wave
- standing wave
- piston
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Abstract
The utility model discloses a circular waveguide stationary wave measuring device used to measure 8mm wave band electric medium; the utility model comprises a wave mode converter, a wave mode suppressor and a circular waveguide stationary wave measuring line, all of which are connected with each other in turn; the circular waveguide stationary wave measuring line positioned at the utmost lower part are provided with a fine regulation micrometer, a crude regulation micrometer, a cylinder wall opening circular waveguide, a piston and a circular waveguide from bottom to up; a cylinder wall small hole is provide on a circular waveguide wall. TE01 mode is adopted; the electricity field of a waveguide cylinder wall is zero; the radial gap between a sample and a waveguide wall only induces very small measurement difference; the reduction of wall consumption improves the accuracy of the measurement of medium consumption. The utility model is particularly suitable for a medium resonator material, a steel electric material and a high thermal medium measurement of high dielectric constant number; moreover, a polytetrafluoroethylene thin circular ring which makes the terminal of a sample be nearly in the open circuit situation can be provided on the upper end of the piston, which makes the electromagnetic parameters of a wave absorbing material can be measured more accurately at the same time.
Description
Technical Field
The invention relates to a circular waveguide standing wave measuring device for measuring eight-millimeter waveband dielectric medium.
Background
In the microwave frequency band, the electrical parameters of the dielectric material are indispensable data for designing dielectric elements and devices, and are the development phaseThe material and dielectric element, microstrip line and microwave integration basis. For materials with low dielectric constant and medium/low loss, a rectangular waveguide standing wave measurement line method, a scattering parameter method or TE (time-out) method are generally adopted at home and abroad 01l The mode resonant cavity method, and for the dielectric resonator material with high dielectric constant and medium/low loss, the TE is generally adopted at home and abroad in the microwave frequency range up to millimeter wave 011 Mold, TE 0m1 A mode dielectric resonant cavity method or an extra-cavity perturbation method. Among these methods, standing wave measurement is convenient and reliable, but has not been reported for a standing wave method capable of simultaneously measuring low and high dielectric constant materials. In addition, the eight millimeter wave band (26.5-40 GHz) is also one of the key frequency bands for military affairs and communication and electronic technology development in the world at present.
Disclosure of Invention
The invention aims to provide a circular waveguide standing wave measuring device for measuring eight-millimeter waveband dielectric.
The circular waveguide standing wave measuring device for measuring eight millimeter wave band dielectric medium is provided with a wave mode converter, a wave mode suppressor and a circular waveguide standing wave measuring line which are connected, wherein the wave mode converter is provided with a cut-off circular waveguide, a power quartering unit and a wave mode conversion unit, the cut-off circular waveguide is arranged on the wave mode conversion unit, the power quartering unit is connected to the periphery of the wave mode conversion unit, the wave mode suppressor is provided with a spiral waveguide, a spiral line is arranged in the spiral waveguide, the circular waveguide standing wave measuring line is sequentially provided with a fine tuning micro-meter, a coarse tuning micro-meter, a cylindrical wall opening circular waveguide, a piston and a circular waveguide from bottom to top, and a cylindrical wall small hole is formed in the wall of the circular waveguide.
The inner diameter of the circular waveguide is 12-13 mm, and a cylindrical wall small hole with the diameter of 0.8-1.2 mm is arranged on the cylindrical wall at the position 50-55 mm away from the piston in the waveguide working area. The upper end of the piston may be provided with a thin circular ring of teflon for placing the sample termination in a near open circuit condition. The inner diameter of the cut-off circular waveguide is 8-8.4 mm, and the inner diameters of the wave mode conversion unit and the spiral waveguide are 12-13 mm.
The invention has the advantages of
TE due to a circle 01 The field cannot propagate in a rectangular waveguide, so it is not possible to obtain the reflection coefficient at the signal input with a network analyzer 01 In this structure, the output of standing wave signal is to use a coupling hole on the cylinder wall to find the node position of standing wave by regulating the adjustable short-circuit pistonThe device is especially suitable for measuring high-temperature or high-dielectric constant dielectric resonator materials and ferroelectric materials, the using frequency of the device is 8.2 GHz-100 GHz, and the device is especially suitable for measuring in eight millimeter wave bands in terms of the size of a circular waveguide.
TE is known from the structure of the electromagnetic field in the waveguide 01 The electric field on the circumferential surface of the mode circular waveguide is zero, so that a radial air gap between a sample and a waveguide wall only causes small measurement error, and the advantage is particularly important for the accurate measurement of a dielectric resonator material with high dielectric constant, a ferroelectric material and the high-temperature measurement of the dielectric material; the measurement of the stealth material can be more accurate and reliable.
Another advantage is that at millimeter wave frequencies, the size of the sample can be larger, thereby reducing the impact of sample size accuracy on the measurement.
A third advantage is that, due to the longer waveguide wavelength, the error effect of the standing wave node position and waveguide wavelength measurement becomes lower when the distance between the sample and the standing wave node probe point is smaller than the waveguide wavelength, e.g., when the signal source has a wavelength of 8.6mm (35 GHz), and the inner diameter of the circular waveguide is 12.7mm, the waveguide wavelength is 15.25mm, which is 1.8 times the free space wavelength.
Furthermore, with this mode, the cavity wall loss is reduced, thereby also increasing the accuracy of the dielectric loss tangent measurement.
Another recognized fact is: when the dielectric sample terminal is used for carrying out standing wave measurement for matched load, the dielectric constant result error obtained when the uncertainty value of the measurement of the standing wave node is 0.002cm is basically the same as that obtained when the short-circuit method is 0.01cm, namely the sample terminal short-circuit method has much higher accuracy than the sample terminal matching method.
Finally, it should be added that in the case of a medium sample ending in a length l (height of the thin polytetrafluoroethylene ring), the general formula can be written
For magnetic materials (for non-magnetic materials μ) r = 1) having
Z 2 /Z 1 ＝μ r γ 1 /γ 2 ＝μ r j2π/(γ 2 λ g )， (2)
μ r ＝μ r ′-jμ r ″， (5)
ε r ＝ε r ′-jε r ″＝ε r ′(1-jtanδ)， (6)
ε r μ r ＝(ε r μ r )′-j(ε r μ r )″。 (7)
In the formula: lambda [ alpha ] g Is the waveguide wavelength; x is the number of 0 Is the distance of the first node from the sample surface; e min /E max Is the voltage-to-standing wave ratio; ω =2 π f is the angular frequency; c is the speed of light; gamma ray 1 ，γ 2 Complex propagation constants of waveguides containing air or medium, respectively; a is the radius of the waveguide or sample; d isThe thickness of the sample; epsilon r Is the relative complex dielectric constant; mu.s r Relative complex permeability.
Since in practical situations, it is generally difficult to achieve an accurate open end of a dielectric sample with a thin teflon ring, but only to make it in a state close to open, equation (1) is very practical, especially for simultaneous measurement of complex permittivity and complex permeability of a magnetic material. In this case, the combination of formula (1) at l =0 and l ≠ 0 twice
In the formula: z (0)/Z 1 Is the measurement to the right of equation (1), lower corner l indicates the case where the sample terminal is near open circuit, and lower corner S indicates the case where it is short circuit (l = 0). This allows to obtain two complex parameters of the material.
Due to the advantages of the invention, when used for stealth material measurement, the sample is put into a rectangular waveguide for measurement S 11 、S 21 The results obtained have a much higher accuracy, especially for measurements in the eight millimeter band.
Drawings
The attached figure is a structural schematic diagram of a circular waveguide standing wave measuring device for measuring eight millimeter waveband dielectrics; in the figure: the device comprises a microwave input signal 1, a cut-off circular waveguide 2, a power quartering unit 3, a wave mode conversion unit 4, a spiral waveguide 5, a standing wave detection signal 6, a cylindrical wall opening circular waveguide 7, a fine tuning micro-device 8, a coarse tuning micro-device 9, a piston 10, a circular waveguide 11, a cylindrical wall small hole 12 and a spiral line 13.
Detailed Description
The invention belongs to a relative complex dielectric constant epsilon of a low/high dielectric constant and medium/high loss microwave dielectric material r ＝ε r ′-jε r ″＝ε r ' (1-jtan. Delta.) measuring TE 01 A mode circular waveguide standing wave measuring line and a necessary matching combination when the circular waveguide standing wave measuring line is used under eight millimeter wave bands.
The circular waveguide standing wave measuring line comprises TE 01 A mode circular waveguide and an adjustable piston. The inner diameter of the circular waveguide is 12-13 mm, and a small hole with the diameter of about 0.8-1.2 mm is arranged on the cylindrical wall at the position which is about 50-55 mm away from the piston in the waveguide working area; the adjustable piston in the circular waveguide has the functions of coarse adjustment and fine adjustment of the double-screw rod, the coarse adjustment stroke is about 60mm, and the diameter of one circle is 2.5mm; the fine adjustment stroke is 25mm, one circle is 0.5mm, and the precision is not lower than 0.001mm, so that the position of the piston can be independently adjusted by the coarse adjustment device and the fine adjustment device respectively; an opening with the height of 15-20 mm multiplied by 180 degrees is arranged on the cylindrical wall at the lower end of the working area of the adjusting piston; by utilizing the rough adjusting device of the piston adjusting mechanism and the opening of the cylindrical wall of the waveguide, the medium sample to be measured can be put in and pushed into the working area of the waveguide or taken out of the waveguide without disassembling the waveguide; TE can be performed by using a fine adjustment device of a piston adjustment mechanism and a small hole above the cylindrical wall of the waveguide 01 Standing wave measurement of the mode. When the medium sample is directly contacted with the piston, the sample terminal is in a short circuit state; when a polytetrafluoroethylene thin ring with 1/4 waveguide wavelength is arranged between the piston and the medium sample, the terminal of the sample is in an open circuit state; thus, TE can be realized in short-circuit or open-circuit, and short-circuit-open-circuit combined states 01 Standing wave measurement of the mode.
The outer diameter of the polytetrafluoroethylene thin ring with the height of 1/4 of the waveguide wavelength is smaller than the inner diameter of the circular waveguide by about 0.1mm, and the wall thickness is about 1mm. Because the electric field near the cylindrical wall of the waveguide is very low, the introduction of the polytetrafluoroethylene thin ring does not cause obvious change of an electromagnetic field in a measuring line, and the measurement proves that no change of standing waves is caused. A series of thin rings of different heights in the eight millimeter wave band that are actually made are often usable only at approximately 1/4 of the waveguide wavelength.
TE is often adopted for low-loss transmission of eight-millimeter wave band microwave signals 10 A rectangular mode waveguide, therefore, a high performance TE must be disposed at the signal input end of the round waveguide standing wave measuring line 10 -TE 01 A wave-mode converter; and allowable TE due to the circular waveguide with an inner diameter of 12-13 mm 11 、TM 01 、TE 21 、TE 01 And TM 11 Degenerate mode and TE 31 The mode passes through, so that a mode suppressor is required to be connected between the wave mode converter and the circular waveguide standing wave measuring line to ensure that only TE 01 The mode energy enters the circular waveguide standing wave measurement line. And both wave mode converters and wave mode suppressors are readily available. The invention designs the wave mode converter, the wave mode suppressor and the circular waveguide standing wave measuring line into the same inner diameter, and connects the same into a cylinder according to the sequence.
The microwave signal input to the rectangular waveguide port of the wave mode converter can adopt a frequency stabilization point frequency signal source, a phase locking signal source or a synthetic signal source; the output end of the standing wave detection small hole on the wall of the circular waveguide of the measuring line is firstly connected with the waveguide impedance tuner and then detected by a nano watt power meter or a detection-amplification device with similar sensitivity and dynamic range.
The dielectric material testing method of the circular waveguide standing wave measuring line comprises the following steps of:
1) A medium sample with the thickness of d is put on the piston and is pushed to the circular waveguide by a coarse adjustment mechanismMeasuring the working area of the line, accurately positioning the line at a certain scale M, adjusting the piston by using a fine adjustment mechanism, and finding out the minimum value reading P of the nanowatt power meter min And corresponding fine-tuning micrometer reading L s Then, find the maximum reading P of the nano watt power meter of the adjacent point max 。
2) Taking out the medium sample, re-positioning the coarse regulating piston at M position, regulating the fine regulating piston, finding out the fine regulating micro meter reading L at two adjacent minimum value readings of the nano watt power meter 01 And L 02 。
3) When the media sample is in direct contact with the piston (short circuit termination), the formula for calculating the relative complex permittivity of the non-magnetic media is derived from equation (1) at l = 0:
in the formula: lambda [ alpha ] g ＝2×(L 02 -L 01 ) Is the waveguide wavelength; x is the number of 0 ＝nλ g /2-d-(L 01 -L s ) (n =1, 2..) is the distance of the first node from the sample surface;
is the voltage standing wave ratio; ω =2 π f is the angular frequency; c is the speed of light; gamma ray 2 Is the complex propagation constant of the dielectric material.
4) When lambda is between the medium sample and the piston g In the case of a/4 gap (open end), equation (1) is simplified to a non-magnetic medium
The complex dielectric constant of the non-magnetic dielectric material is obtained from the formulas (11) and (12).
When the combined measurement of the short-circuit terminal and the open-circuit terminal is carried out, the relative complex permeability mu of the magnetic material can be obtained by combining the formula (10) and the formula (12) at the same time r And a relative complex dielectric constant ε r 。
As shown in the attached figure, the circular waveguide standing wave measuring device for measuring the dielectric medium with eight millimeter wave bands is provided with a wave mode converter, a wave mode suppressor and a circular waveguide standing wave measuring line; the wave mode converter comprises a cut-off circular waveguide 2, a power quartering unit 3, a wave mode conversion unit 4 and a microwave input signal 1 at an inlet of the wave mode conversion unit; the lower end of the wave mode converter is provided with a spiral wave mode suppressor which is composed of a spiral waveguide 5 and a spiral line 12; the lower end of the wave mode suppressor is provided with a circular waveguide standing wave measuring line which comprises a circular waveguide 11, a piston 10, a fine tuning micro-device 8 and a coarse tuning micro-device 9, a cylindrical wall small hole 12 is arranged above the cylindrical wall of the circular waveguide and outputs a standing wave detection signal 6, and a cylindrical wall open circular waveguide 7 is arranged below the circular waveguide. In the circular waveguide standing wave measuring line and the matched combination, the wave mode conversion unit 4, the spiral waveguide 5, the circular waveguide 11 and the cylindrical wall opening circular waveguide 7 have the same inner diameter and are 12-13 mm at eight millimeter wave bands; the inner diameter of the cut-off circular waveguide 2 is 8.0-8.4 mm.
By utilizing the rough adjusting device of the piston adjusting mechanism and the cylindrical wall opening circular waveguide, a medium sample to be tested can be put in, pushed into a working area of the circular waveguide or taken out of the circular waveguide without disassembling the device; when frequency-stabilized microwave signal is input from inlet of wave mode converter, the output signal is existed at small hole of cylindrical wall of waveguide, and passed through waveguide impedance tuner, and fed into microwave power meter from nano watt sensor, and the fine-regulation device of piston regulation mechanism can be used for implementing TE 01 Standing wave measurement of the mode. When the medium sample is directly contacted with the piston, the sample terminal is in a short-circuit state; when a polytetrafluoroethylene thin ring with the wave length close to 1/4 of that of the waveguide is arranged between the piston and the medium sample, the terminal of the sample is close to an open circuit state; thus, TE can be realized in 3 states of short circuit, near open circuit or short circuit-near open circuit 01 Standing wave measurement of the mode.
Connecting a microwave signal source to a microwave input signal 1 of the circular waveguide standing wave measuring device for measuring the dielectric medium with eight millimeter wave bands, connecting an impedance tuner to a standing wave detection signal 6, and connecting the impedance tuner with a nano watt power sensor-microwave power indicator to form a test system; at any spot frequency of the eight millimeter wave band, the following measurements can be made.
The dielectric material testing method of the circular waveguide standing wave measuring line under the state that the sample terminal is short-circuited comprises the following steps:
1) Putting a medium sample with the thickness of d on a piston, pushing the medium sample to a working area of a circular waveguide measuring line by using a coarse adjustment mechanism, accurately positioning the medium sample at a certain scale M, and thinning the medium sampleAdjusting the piston of the mechanism to find the minimal value reading P of the nanowatt power meter min And corresponding fine-tuning micrometer reading L s Then find the maximum reading P of the nano watt power meter of the adjacent point max 。
2) Taking out the medium sample, re-positioning the coarse regulating piston at M position, regulating the fine regulating piston, finding out the fine regulating micro meter reading L at two adjacent minimum value readings of the nano watt power meter 01 And L 02 。
3) The relative complex permittivity of a medium is calculated according to the well-known formula:
in the formula: lambda [ alpha ] g ＝2×(L 02 -L 01 ) Is the waveguide wavelength; x is the number of 0 ＝nλ g /2-d-(L 01 -L s ) (n =1, 2.) is the distance of the first node to the sample surface;is the voltage standing wave ratio; ω =2 π f is the angular frequency;
c is the speed of light; gamma ray 2 Is the complex propagation constant of the dielectric material.
Near open circuit at sample termination (l ≈ λ) g The dielectric material testing method of the circular waveguide standing wave measuring line in the state of 4) comprises the following steps:
1) Firstly, placing a polytetrafluoroethylene thin ring with the height of l on a piston, then placing a medium sample with the thickness of d, utilizing a coarse adjustment mechanism to push the medium sample into a working area of a circular waveguide measuring line, accurately positioning the medium sample at a certain scale M, using a fine adjustment mechanism to adjust the piston, and finding out a minimum reading P of the nanowatt dynamometer min And corresponding fine-tuning micrometer reading L s Then find the maximum reading P of the nano watt power meter of the adjacent point max 。
2) Taking out the medium sample, re-positioning the coarse regulating piston at M position, regulating the fine regulating piston, finding out the fine regulating micro meter reading L at two adjacent minimum value readings of the nano watt power meter 01 And L 02 。
3) The relative complex permittivity of the medium is calculated as follows:
simultaneous measurement of the complex permittivity and complex permeability of a magnetic material, comprising the steps of:
1) The measurement in the short-circuited state of the sample terminals described above was redone, obtained from equation (1)
2) Redoing the sample termination approach to open circuit (l ≈ λ) as described above g Measurement in the state of/4), obtained from the formula (1)
The following equations are obtained from equations (13) and (14) and used to calculate the complex permittivity and complex permeability of the magnetic medium:
in the formula
Z 2 /Z 1 ＝μ r γ 1 /γ 2 ＝μ r j2π/(γ 2 λ g )， (2)
μ r ＝μ r ′-jμ r ″， (5)
Claims (4)
1. A circular waveguide standing wave measuring device for measuring eight-millimeter wave band dielectric is characterized by comprising a wave mode converter, a wave mode suppressor and a circular waveguide standing wave measuring line which are connected, wherein the wave mode converter is provided with a cut-off circular waveguide (2), a power quartering unit (3) and a wave mode conversion unit (4), the cut-off circular waveguide (2) is arranged on the wave mode conversion unit (4), the power quartering unit (3) is connected to the periphery of the wave mode conversion unit (4), the wave mode suppressor is provided with a spiral waveguide (5), a spiral line (13) is arranged in the spiral waveguide (5), the circular waveguide standing wave measuring line is sequentially provided with a fine adjusting micro-meter (8), a coarse adjusting micro-meter (9), a cylindrical wall open circular waveguide (7), a piston (10) and a circular waveguide (11) from bottom to top, and a cylindrical wall small hole (12) is formed in the wall of the circular waveguide (11).
2. The circular waveguide standing wave measuring device for dielectric measurement of eight millimeter wave bands of claim 1, wherein the inner diameter of the circular waveguide (11) is 12-13 mm, and a cylindrical wall small hole (12) with a diameter of 0.8-1.2 mm is arranged on the cylindrical wall at the position 50-55 mm away from the piston in the waveguide working area.
3. A circular waveguide standing wave measuring device for eight millimeter waveband dielectric measurement according to claim 1, characterized in that the upper end of the piston (10) can be provided with a teflon thin circular ring for enabling the sample terminal to be in a near open circuit state.
4. The circular waveguide standing wave measuring device for dielectric measurement of eight millimeter waveband according to claim 1, wherein the inner diameter of the cut-off circular waveguide (2) is 8-8.4 mm, and the inner diameters of the wave mode converting unit (4) and the spiral waveguide (5) are 12-13 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100677394A CN100523834C (en) | 2007-03-22 | 2007-03-22 | Circular waveguide standing wave measurement device for eight mm waveband dielectric measurement |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100677394A CN100523834C (en) | 2007-03-22 | 2007-03-22 | Circular waveguide standing wave measurement device for eight mm waveband dielectric measurement |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101105512A true CN101105512A (en) | 2008-01-16 |
| CN100523834C CN100523834C (en) | 2009-08-05 |
Family
ID=38999499
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2007100677394A Expired - Fee Related CN100523834C (en) | 2007-03-22 | 2007-03-22 | Circular waveguide standing wave measurement device for eight mm waveband dielectric measurement |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100523834C (en) |
Cited By (22)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102280676A (en) * | 2011-06-13 | 2011-12-14 | 中国工程物理研究院电子工程研究所 | Circular waveguide TE01 mode converter |
| CN102608431A (en) * | 2012-03-12 | 2012-07-25 | 浙江大学 | Coaxial-dielectric circular waveguide resonant cavity with frequency range of 1GHz-8GHz and dielectric parameter testing method |
| US9304235B2 (en) | 2014-07-30 | 2016-04-05 | Microsoft Technology Licensing, Llc | Microfabrication |
| US9372347B1 (en) | 2015-02-09 | 2016-06-21 | Microsoft Technology Licensing, Llc | Display system |
| US9423360B1 (en) | 2015-02-09 | 2016-08-23 | Microsoft Technology Licensing, Llc | Optical components |
| US9429692B1 (en) | 2015-02-09 | 2016-08-30 | Microsoft Technology Licensing, Llc | Optical components |
| US9513480B2 (en) | 2015-02-09 | 2016-12-06 | Microsoft Technology Licensing, Llc | Waveguide |
| US9535253B2 (en) | 2015-02-09 | 2017-01-03 | Microsoft Technology Licensing, Llc | Display system |
| US9678542B2 (en) | 2012-03-02 | 2017-06-13 | Microsoft Technology Licensing, Llc | Multiple position input device cover |
| US9787576B2 (en) | 2014-07-31 | 2017-10-10 | Microsoft Technology Licensing, Llc | Propagating routing awareness for autonomous networks |
| US9827209B2 (en) | 2015-02-09 | 2017-11-28 | Microsoft Technology Licensing, Llc | Display system |
| US9904327B2 (en) | 2012-03-02 | 2018-02-27 | Microsoft Technology Licensing, Llc | Flexible hinge and removable attachment |
| US10018844B2 (en) | 2015-02-09 | 2018-07-10 | Microsoft Technology Licensing, Llc | Wearable image display system |
| RU2664975C1 (en) * | 2017-05-10 | 2018-08-24 | Акционерное общество "Конструкторское бюро приборостроения им. академика А.Г. Шипунова" | Te01 wave exciter |
| US10254942B2 (en) | 2014-07-31 | 2019-04-09 | Microsoft Technology Licensing, Llc | Adaptive sizing and positioning of application windows |
| US10317677B2 (en) | 2015-02-09 | 2019-06-11 | Microsoft Technology Licensing, Llc | Display system |
| US10324733B2 (en) | 2014-07-30 | 2019-06-18 | Microsoft Technology Licensing, Llc | Shutdown notifications |
| CN110609216A (en) * | 2019-11-03 | 2019-12-24 | 西南交通大学 | Motor train unit cable terminal fault positioning method |
| US10592080B2 (en) | 2014-07-31 | 2020-03-17 | Microsoft Technology Licensing, Llc | Assisted presentation of application windows |
| US10678743B2 (en) | 2012-05-14 | 2020-06-09 | Microsoft Technology Licensing, Llc | System and method for accessory device architecture that passes via intermediate processor a descriptor when processing in a low power state |
| US10678412B2 (en) | 2014-07-31 | 2020-06-09 | Microsoft Technology Licensing, Llc | Dynamic joint dividers for application windows |
| US11086216B2 (en) | 2015-02-09 | 2021-08-10 | Microsoft Technology Licensing, Llc | Generating electronic components |
-
2007
- 2007-03-22 CN CNB2007100677394A patent/CN100523834C/en not_active Expired - Fee Related
Cited By (25)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102280676A (en) * | 2011-06-13 | 2011-12-14 | 中国工程物理研究院电子工程研究所 | Circular waveguide TE01 mode converter |
| US9678542B2 (en) | 2012-03-02 | 2017-06-13 | Microsoft Technology Licensing, Llc | Multiple position input device cover |
| US10963087B2 (en) | 2012-03-02 | 2021-03-30 | Microsoft Technology Licensing, Llc | Pressure sensitive keys |
| US10013030B2 (en) | 2012-03-02 | 2018-07-03 | Microsoft Technology Licensing, Llc | Multiple position input device cover |
| US9904327B2 (en) | 2012-03-02 | 2018-02-27 | Microsoft Technology Licensing, Llc | Flexible hinge and removable attachment |
| CN102608431A (en) * | 2012-03-12 | 2012-07-25 | 浙江大学 | Coaxial-dielectric circular waveguide resonant cavity with frequency range of 1GHz-8GHz and dielectric parameter testing method |
| CN102608431B (en) * | 2012-03-12 | 2014-01-29 | 浙江大学 | Coaxial-dielectric circular waveguide resonant cavity with frequency range of 1GHz-8GHz and dielectric parameter testing method |
| US10678743B2 (en) | 2012-05-14 | 2020-06-09 | Microsoft Technology Licensing, Llc | System and method for accessory device architecture that passes via intermediate processor a descriptor when processing in a low power state |
| US10324733B2 (en) | 2014-07-30 | 2019-06-18 | Microsoft Technology Licensing, Llc | Shutdown notifications |
| US9304235B2 (en) | 2014-07-30 | 2016-04-05 | Microsoft Technology Licensing, Llc | Microfabrication |
| US10254942B2 (en) | 2014-07-31 | 2019-04-09 | Microsoft Technology Licensing, Llc | Adaptive sizing and positioning of application windows |
| US9787576B2 (en) | 2014-07-31 | 2017-10-10 | Microsoft Technology Licensing, Llc | Propagating routing awareness for autonomous networks |
| US10678412B2 (en) | 2014-07-31 | 2020-06-09 | Microsoft Technology Licensing, Llc | Dynamic joint dividers for application windows |
| US10592080B2 (en) | 2014-07-31 | 2020-03-17 | Microsoft Technology Licensing, Llc | Assisted presentation of application windows |
| US10317677B2 (en) | 2015-02-09 | 2019-06-11 | Microsoft Technology Licensing, Llc | Display system |
| US10018844B2 (en) | 2015-02-09 | 2018-07-10 | Microsoft Technology Licensing, Llc | Wearable image display system |
| US9535253B2 (en) | 2015-02-09 | 2017-01-03 | Microsoft Technology Licensing, Llc | Display system |
| US9423360B1 (en) | 2015-02-09 | 2016-08-23 | Microsoft Technology Licensing, Llc | Optical components |
| US9429692B1 (en) | 2015-02-09 | 2016-08-30 | Microsoft Technology Licensing, Llc | Optical components |
| US9372347B1 (en) | 2015-02-09 | 2016-06-21 | Microsoft Technology Licensing, Llc | Display system |
| US9513480B2 (en) | 2015-02-09 | 2016-12-06 | Microsoft Technology Licensing, Llc | Waveguide |
| US9827209B2 (en) | 2015-02-09 | 2017-11-28 | Microsoft Technology Licensing, Llc | Display system |
| US11086216B2 (en) | 2015-02-09 | 2021-08-10 | Microsoft Technology Licensing, Llc | Generating electronic components |
| RU2664975C1 (en) * | 2017-05-10 | 2018-08-24 | Акционерное общество "Конструкторское бюро приборостроения им. академика А.Г. Шипунова" | Te01 wave exciter |
| CN110609216A (en) * | 2019-11-03 | 2019-12-24 | 西南交通大学 | Motor train unit cable terminal fault positioning method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100523834C (en) | 2009-08-05 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101105512A (en) | Circular waveguide standing wave measurement device for eight mm waveband dielectric measurement | |
| CN110531165B (en) | Novel high-precision dielectric constant test system based on microwave sensor | |
| CN112505429B (en) | Complex dielectric constant test system and test method based on coaxial strip line resonator | |
| Han et al. | Microwave sensor loaded with complementary curved ring resonator for material permittivity detection | |
| Bakır et al. | Metamaterial sensor for transformer oil, and microfluidics | |
| CN108828321B (en) | Differential microwave sensor for measuring dielectric constant | |
| CN109030955A (en) | A kind of portable fluid dielectric constant measurement system based on SIW | |
| Raveendran et al. | Complex permittivity extraction of planar dielectrics using a noninvasive microwave transmission line resonant technique | |
| Gui et al. | Open resonator system for automatic and precise dielectric measurement at millimeter wavelengths | |
| Wang et al. | A dual-band non-destructive dielectric measurement sensor based on complementary split-ring resonator | |
| Shi et al. | Complex permittivity measurement utilizing multiple modes of a rectangular cavity | |
| Zhang et al. | High sensitivity refractive index sensor based on frequency selective surfaces absorber | |
| Egorov et al. | Dielectric constant, loss tangent, and surface resistance of PCB materials at K-band frequencies | |
| CN108414839B (en) | FSS-based complex dielectric constant measurement system by resonance method | |
| Fan et al. | A multiple resonant frequencies sensor for measuring permittivity based on stepped impedance resonator | |
| CN109039330A (en) | A kind of Portable material dielectric constant measurement system based on CMRC structure | |
| Wu et al. | A differential microwave sensor loaded with magnetic-LC resonators for simultaneous thickness and permittivity measurement of material under test by odd-and even-mode | |
| CN104076205B (en) | Whispering-gallery-mode resonator is used in measurement | |
| CN109239457A (en) | Microwave surface resistance continuous frequency spectrum test device | |
| RU2332658C1 (en) | Device to measure dielectric covering thickness | |
| Seewattanapon et al. | A microstrip folded resonator sensor for measurement of dielectric constant | |
| Jiang et al. | High‐precision dielectric sensor system based on balanced CSRR‐SIW resonators | |
| Lee et al. | Microstrip-Line Sensor for the Estimation of the Fluid Level Inside a Closed Metal Pipe | |
| Qi et al. | A quarter-mode substrate integrated waveguide microwave sensor loaded with CCRR for solid material measurement | |
| Huang et al. | A Novel Permittivity Measurement Method Using Multiple TM mn0 Modes of Cylindrical Cavity |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090805 Termination date: 20110322 |