CN113567750A - System and method for automatically testing broadband of quasi-optical cavity - Google Patents
System and method for automatically testing broadband of quasi-optical cavity Download PDFInfo
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- G—PHYSICS
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/26—Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants ; Measuring impedance or related variables
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/26—Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants ; Measuring impedance or related variables
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Abstract
The invention discloses a system and a method for automatically testing the broadband of a quasi-optical cavity, belonging to the technical field of testing, aiming at the problem of difficult identification of a high-frequency mode, firstly, a programmable control motor is designed and used for fixing a filter plate and adjusting the height of the filter plate, secondly, different frequency field distributions of a main mode are analyzed to determine the position of the most suitable filter plate of a corresponding frequency band, the position of the fixed filter plate of the motor is controlled and adjusted according to the change of the testing frequency to obtain the frequency and position relation of the filter plate, and the problem that the purification effect of the broadband testing mode brought by fixing the filter plate is poor and is not beneficial to mode identification is solved; and finally, realizing the automatic broadband test of the quasi-optical cavity system by software integration.
Description
Technical Field
The invention belongs to the technical field of testing, and particularly relates to a system and a method for automatically testing a broadband of a quasi-optical cavity.
Background
At present, the dielectric property of the low-loss material in the millimeter wave frequency band is mainly tested by adopting a quasi-optical resonant cavity (quasi-optical cavity) method. The higher order resonant modes in the quasi-optical cavity increase significantly with increasing frequency. The higher-order mode not only affects the resonance performance of the main mode (test mode) to reduce the quality factor of the main mode, but also the resonance mode close to the main mode can be superposed with the main mode to cause the distortion of a resonance peak. In the high-frequency test process, the superposition of a plurality of high-order mode resonances with the same resonant frequency leads to the resonant power being higher than the test mode, and great difficulty is brought to the mode identification of the main mode.
At present, a millimeter wave filtering structure of a quasi-optical cavity mainly adopts a mode of adding a filtering sleeve and a filtering plate. Within the W-band bandwidth, the influence of higher-order modes of different frequencies is inconsistent, and the beam waist at the same height of the quasi-optical cavity resonant mode beam is reduced along with the increase of the frequency. For the filter plate with fixed height or the filter sleeve with fixed size, the size and the position can not change along with the frequency, so the broadband test filter effect is different. When the broadband test is carried out, a filter plate and a filter sleeve are designed according to the lowest frequency, and the filter effect is deteriorated after the frequency is increased; designing the filter plate and the filter sleeve according to the highest frequency interferes the main mode to reduce the quality factor of the main mode and causes the resonance frequency shift during the low frequency test.
With the development of the field of 5G radio frequency communication and the layout of 6G communication, the application frequency has gradually developed from centimeter wave to millimeter wave, and gradually developed to the terahertz frequency band. The microwave dielectric material is widely applied to the fields of communication, radar, biomedicine, chemical industry and the like, wherein the accuracy of dielectric parameters of the dielectric material can influence the performance of electronic equipment, and the accurate understanding of electromagnetic characteristic parameters of the microwave material has important significance for the application of the microwave dielectric material.
For the dielectric property test of materials, the current common test methods mainly include a plate capacitance method, a network parameter method, a resonance method and the like. The plate capacitance method is mainly used for low frequency bands, and the accuracy of the dielectric property test of the material by the network parameter method is about 3%. The resonance method comprises a dielectric resonator method and a resonant cavity method, and the test precision is superior to 1%. At present, the dielectric property test method of the material in the millimeter wave frequency band mainly comprises a free space method and a quasi-optical cavity method. The free space method is generally used for measuring medium and high loss materials with large areas, and the loss tangent value of a low loss material cannot be accurately measured. The quasi-optical cavity method belongs to a resonance method and is suitable for testing the dielectric property of a low-loss material. The quasi-optical cavity method has two structures, namely a semi-symmetrical quasi-optical cavity (flat cavity) and a symmetrical quasi-optical cavity (double spherical cavity), and the structure is schematically shown in fig. 1. The flat concave cavity has the advantages of convenient sample loading, low processing cost and the like, and is widely adopted. The invention relates to a flat concave cavity quasi-optical cavity test.
Quasi-optical intracavity mode is TEMplqModulo plq is an integer. Wherein the TEM00qThe main mode is the test mode. The formula for the resonant frequency of all modes is shown below. The number of resonant modes increases significantly with increasing frequency, meaning that higher order modes interfere with the main mode more and more with increasing frequency. It can also be seen from the formula that many higher order modes have the same resonant frequency, e.g. TEM10qAnd TEM01qHigh-order modes with the same resonant frequency can be superposed, and the resonant power can exceed the main mode at high frequency, so that the automatic test mode identification is difficult.
Quasi-optical cavity testing typically starts to suffer from higher order mode interference below 40GHz, but the primary mode is still easily identifiable. And when the frequency band exceeds 40GHz, high-order mode suppression is required. The basic principle of high-order mode suppression is that the mode suppression effect is achieved by adding a proper structure to destroy the electric field of a high-order mode without interfering the main mode by utilizing the difference of the main mode and the high-order mode field. The filtering structure commonly used at present mainly comprises a filtering ring and a filtering sleeve, which are respectively shown in fig. 2. The electric field distribution of the main mode and the higher-order modes of the adjacent frequencies is shown in FIG. 3.
The filtering sleeve and the filtering plate both utilize the characteristic that metal materials can reflect and block electromagnetic waves, and because the main mode energy is mainly concentrated at the axis, the high-order mode energy can be diffused to the edge, the filtering structure adopts a hollow structure according to an electric field corresponding to a test mode, and the metal is arranged outside the filtering structure to inhibit the high-order mode from being transmitted. However, when the test frequency is increased, the wave numbers of the main mode and the high-order mode become narrow, the energy is more concentrated at the axis, the filtering effect becomes poor when the filtering structure designed at the lower frequency is applied to the high frequency, and the filtering structure is not suitable for the broadband continuous test.
The prior art has the following disadvantages:
the quasi-optical cavity interference resonance mode increases greatly with increasing frequency, seriously affecting the resonance performance of the main mode and bringing considerable difficulty to mode identification. The high-order mode influence conditions of different frequencies are inconsistent, and the beam waist at the same height of the quasi-optical cavity resonant mode beam is reduced along with the increase of the frequency. For the filter plate with fixed height or the filter sleeve with fixed size, the size and the position can not change along with the frequency, so the broadband test filter effect is different. When the broadband test is carried out, a filter plate and a filter sleeve are designed according to the lowest frequency, and the filter effect is deteriorated after the frequency is increased; designing the filter plate and the filter sleeve according to the highest frequency interferes the main mode to reduce the quality factor of the main mode and causes the resonance frequency shift during the low frequency test.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention provides a quasi-optical cavity broadband automatic test system and a test method, which are reasonable in design, overcome the defects of the prior art and have good effects.
In order to achieve the purpose, the invention adopts the following technical scheme:
a quasi-optical cavity broadband automatic test system comprises a filter plate and a programmable control motor; the filter plate is fixed on the programmable control motor.
In addition, the invention also provides a quasi-optical cavity broadband automatic test method, which adopts the quasi-optical cavity broadband automatic test system and specifically comprises the following steps:
step 1: fixing the filter plate and adjusting the height of the filter plate through a programmable control motor; automatically adjusting the position along with the frequency change of the test system;
step 2: analyzing electric field distribution of different frequency test modes, determining the position of a filter plate of a corresponding frequency band according to the electric field distribution of the main mode, and controlling and adjusting the position of a fixed filter plate of a programmable control motor according to the change of test frequency to obtain the corresponding relation between the frequency and the position of the filter plate; controlling the height change of the programmable control motor along with the change of the test frequency;
and step 3: and controlling the programmable control motor to move up and down according to the test frequency, so as to realize the automatic broadband test of the quasi-optical cavity system.
Preferably, the position of the filter plate has an influence on the test frequency, and in order to ensure the test accuracy, the position of the filter plate is ensured to be consistent when the cavity test and the sample loading test are carried out; during testing, firstly, cavity scanning test is carried out, and a main test mode is TEM00qAnd gradually increasing q value, wherein q represents a mode value, the test mode is gradually changed, the test frequency is gradually increased, the frequency is increased along with the test, the position of the filter plate is firstly adjusted and then the test data is acquired when each frequency point is tested, and after the test of the corresponding frequency cavity is finished, the data acquisition is carried out according to the corresponding mode when the sample is loaded.
The invention has the following beneficial technical effects:
in the prior quasi-optical cavity test system, the size and the position of a filter plate with fixed height or a filter sleeve with fixed size cannot be changed along with the frequency, so that the broadband test filtering effect is different; when the broadband test is carried out, a filter plate and a filter sleeve are designed according to the lowest frequency, and the filter effect is deteriorated after the frequency is increased; designing the filter plate and the filter sleeve according to the highest frequency interferes the main mode to reduce the quality factor of the main mode and causes the resonance frequency shift during the low frequency test.
Aiming at the problem of difficult high-frequency mode identification, the method comprises the steps of firstly designing and fixing a filter plate by using a programmable control motor and adjusting the height of the filter plate, secondly analyzing different frequency field distributions of a main mode to determine the position of the optimal filter plate of a corresponding frequency band, controlling and adjusting the position of the fixed filter plate by using the motor according to the change of test frequency to obtain the frequency and position relation of the filter plate, and solving the problem that the purification effect of a broadband test mode brought by fixing the filter plate is poor and is not beneficial to mode identification; and finally, realizing the automatic broadband test of the quasi-optical cavity system by software integration.
Drawings
FIG. 1 is a schematic diagram of an optical alignment cavity fixture.
FIG. 2 is a diagram of a quasi-optical cavity clamp filtering arrangement.
Wherein, the diagram (a) is a structural schematic diagram of the filtering sleeve; FIG. (b) is a diagram of a model of the filter plate;
FIG. 3 is a diagram of electric field distribution of the main mode and the higher-order mode of the quasi-optical cavity;
wherein, figure (a) is a master mode TEM00qAn electric field profile; FIG. b is a high-order mode TEM11qAn electric field profile;
FIG. 4 is a diagram of electric field distribution of different frequencies of the main mode;
wherein, the diagram (a) is the 40GHz electric field distribution diagram of the main mode; FIG. b is the 84GHz electric field distribution diagram of the main mode; FIG. c is a diagram of the 101GHz electric field distribution of the master mode; FIG. d is a 110GHz electric field distribution diagram of the master mode.
Detailed Description
The invention is described in further detail below with reference to the following figures and detailed description:
the invention adopts a filter plate mode to carry out high-order mode suppression. The size of the filtering structure can not be changed according to the frequency, so that the height of the filtering structure can be adjusted according to the testing frequency by adopting a filtering plate filtering mode, and the frequency self-adaptive broadband quasi-optical cavity method automatic testing is realized.
The invention designs that a filter plate is fixed on a motor which can be controlled to move up and down in a programmable way, the most suitable placement height of the filter plate is determined by analyzing the distribution conditions of main mode fields with different frequencies, the corresponding relation between the frequency and the height is established, then the height of the filter plate is controlled by a program to be automatically adjusted along with the change of the test frequency, and the motor is controlled by software to realize the automatic control of a system together with the integration of test acquisition data and calculation. The invention takes the following size quasi-optical cavity clamp as an example to introduce the analysis relation of the size of the opening of the filter plate and the height control, and the design method is a general design and does not aim at the specific size quasi-optical cavity clamp.
The curvature radius R of the concave mirror of the quasi-optical cavity is 180mm, and the length D of the cavity is 170 mm. It can be seen from fig. 4 that the mode field distributions of the main mode in different frequency bands are different, the radius of the beam waist of the main mode is gradually reduced along with the increase of the frequency, and the beam waist of the higher-order mode is also gradually reduced along with the frequency, so that the inner diameter of the opening of the filter plate is gradually reduced after the test frequency is increased. During testing, the size of the inner diameter of the filter plate is difficult to realize, and the z-direction height of the filter plate is adjusted dynamically by fixing the ratio of the inner diameter to the beam waist. And simulating and calculating the electric field distribution of different frequencies and different test modes by using electromagnetic simulation software, and establishing the corresponding relation between the frequency and the position by using the ratio of the inner diameter of the filter plate to the beam waist. The actual position relationship should also be adjusted according to the actual measurement effect of the processing hardware.
And after the corresponding relation between the frequency and the position is obtained, the motor is controlled to move up and down through software programming according to the test frequency, and the software control and the acquisition of the test parameters are integrated together. The position of the filter plate is adjusted to slightly influence the resonant frequency and the quality factor, and the position of the filter plate is ensured to be consistent when the cavity test and the loading sample test are carried out to ensure the test accuracy. During testing, firstly, cavity scanning test is carried out, and a main test mode is TEM00qAnd gradually increasing the q value, gradually changing the test mode and gradually increasing the test frequency. And (3) as the test is carried out, the frequency is increased, and when one frequency point is tested, the position of the filter plate is adjusted firstly, and then the test data is collected. And after the corresponding frequency cavity test is finished, acquiring data when the sample is loaded according to the corresponding mode.
The system provided by the invention is mainly used for carrying out frequency self-adaptive design on a dielectric property test filtering structure by a broadband quasi-optical cavity method. The height of the filter plate is adjusted through the programmable control motor, and the position of the filter plate is automatically adjusted along with the frequency change of the test system, so that different changes of filter structures in different modes are realized.
The invention analyzes the electric field distribution of different frequency test modes, determines the most suitable position of the filter plate according to the electric field distribution of the main mode, establishes the corresponding relation of the position and the frequency, and controls the height change of the motor along with the change of the test frequency.
The invention realizes the high-integration automatic test system for the dielectric property of the broadband high-frequency quasi-optical cavity.
It is to be understood that the above description is not intended to limit the present invention, and the present invention is not limited to the above examples, and those skilled in the art may make modifications, alterations, additions or substitutions within the spirit and scope of the present invention.
Claims (3)
1. A quasi-optical cavity broadband automatic test system is characterized in that: the device comprises a filter plate and a programmable control motor; the filter plate is fixed on the programmable control motor.
2. A method for automatically testing the broadband of a quasi-optical cavity is characterized by comprising the following steps: the system for broadband automatic testing of quasi-optical cavity according to claim 1, comprising the following steps:
step 1: fixing the filter plate and adjusting the height of the filter plate through a programmable control motor; automatically adjusting the position along with the frequency change of the test system;
step 2: analyzing electric field distribution of different frequency test modes, determining the position of a filter plate of a corresponding frequency band according to the electric field distribution of the main mode, and controlling and adjusting the position of a fixed filter plate of a programmable control motor according to the change of test frequency to obtain the corresponding relation between the frequency and the position of the filter plate; controlling the height change of the programmable control motor along with the change of the test frequency;
and step 3: and controlling the programmable control motor to move up and down according to the test frequency, so as to realize the automatic broadband test of the quasi-optical cavity system.
3. The method of claim 2, wherein the method comprises: the position of the filter plate influences the test frequency, and in order to ensure the test accuracy, the position of the filter plate is ensured to be consistent when the cavity test and the sample loading test are carried out; during testing, firstly, cavity scanning test is carried out, and a main test mode is TEM00qAnd gradually increasing q value, wherein q represents a mode value, the test mode is gradually changed, the test frequency is gradually increased, the frequency is increased along with the test, the position of the filter plate is firstly adjusted and then the test data is acquired when each frequency point is tested, and after the test of the corresponding frequency cavity is finished, the data acquisition is carried out according to the corresponding mode when the sample is loaded.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112444681A (en) * | 2020-11-30 | 2021-03-05 | 山东国瓷功能材料股份有限公司 | Dielectric material testing system, method, device and platform |
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| CN106053956A (en) * | 2016-07-19 | 2016-10-26 | 电子科技大学 | Material dielectric constant testing system and testing method based on same |
| CN112230068A (en) * | 2020-09-21 | 2021-01-15 | 电子科技大学 | Frequency-adjustable complex dielectric constant test system and method based on reentrant coaxial cavity |
| CN112444681A (en) * | 2020-11-30 | 2021-03-05 | 山东国瓷功能材料股份有限公司 | Dielectric material testing system, method, device and platform |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106053956A (en) * | 2016-07-19 | 2016-10-26 | 电子科技大学 | Material dielectric constant testing system and testing method based on same |
| CN112230068A (en) * | 2020-09-21 | 2021-01-15 | 电子科技大学 | Frequency-adjustable complex dielectric constant test system and method based on reentrant coaxial cavity |
| CN112444681A (en) * | 2020-11-30 | 2021-03-05 | 山东国瓷功能材料股份有限公司 | Dielectric material testing system, method, device and platform |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112444681A (en) * | 2020-11-30 | 2021-03-05 | 山东国瓷功能材料股份有限公司 | Dielectric material testing system, method, device and platform |
| CN112444681B (en) * | 2020-11-30 | 2022-07-15 | 山东国瓷功能材料股份有限公司 | Dielectric material testing system, method, device and platform |
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