Method for identifying TE011 resonance mode under condition of failure to estimate dielectric constant of material
A technology of TE011, dielectric constant, applied in the direction of dielectric property measurement, measurement of resistance/reactance/impedance, measurement of electrical variables, etc., can solve problems such as inability to estimate dielectric constant, pattern recognition error, recognition difficulty, etc., to avoid pattern The effect of identifying errors
Active Publication Date: 2021-07-23
ZHEJIANG UNIV
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Problems solved by technology
However, in many occasions, it is impossible to estimate the dielectric constant of the sample or the range of the estimated dielectric constant cannot meet the test requirements, TE 011 Pattern recognition becomes difficult
Especially, when the dielectric constant of the sample is low, the TE 011 The resonant frequency of the mode is sensitive to the change of the dielectric constant, and the spurious mode peak is more likely to appear in the TE 011 Near the mode peak, it is more likely to cause mode recognition errors
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[0020] The technical scheme of the present invention will be further described below in conjunction with the accompanying drawings. In the present invention, the identification of TE 011 The specific steps of resonance mode are as follows:
[0021] Resonant cavity method:
[0022] (1) Set the diameter to D s , thickness H s The sample to be tested is placed on the support in the metal resonant cavity, as shown in Figure 1(a). Use a network analyzer to test the resonant frequency f corresponding to each resonant peak 0,i . Assume that either resonance peak corresponds to TE 011 mode, f 0,i can be expressed as D s 、H s , ε r,i function g 1 :
[0023] f 0,i =g 1 (D s ,H s ,ε r,i ). (1)
[0024] when D s and H s When known, ε r,i with f 0,i There is a one-to-one correspondence. Therefore, according to formula (1), using the numerical method can be obtained by D s 、H s , f 0,i Find ε r,i .
[0025] (2) Set the thickness to H m The metal ring is placed b...
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The invention discloses a method for identifying a TE011 resonance mode under condition of failure to estimate the dielectric constant of a material. The method is suitable for identifying the TE011 resonant mode when a resonant cavity method or a parallel plate method is used for testing the microwave dielectric property of a low-loss material. According to the method,any resonance peak in test frequency range is assumed as a resonance peak of a TE011 mode, and a corresponding sample dielectric constant is calculated by using a numerical method; the distance between the upper metal surface of a resonant cavity or a parallel plate and a sample is changed by using a metal ring or a dielectric sheet, the change of the resonant frequency is calculated by using a numerical method according to the dielectric constant corresponding to each harmonic peak obtained by calculation, and the change is compared with an actual test result; the difference between the calculated value and the measured value of the resonant frequency change of the TE011 mode is generally within 2%, and the difference between other modes is higher than one order of magnitude, so that the method can accurately and quickly identify the TE011 mode from a large number of interference modes.
Description
technical field [0001] The invention belongs to the technical field of microwave testing, and relates to a testing technology for microwave dielectric properties of low-loss materials, in particular to a method for identifying TE when the dielectric constant of the material cannot be estimated. 011 method of resonant mode. Background technique [0002] Low-loss microwave dielectric materials are widely used in the field of microwave communication, and the accurate evaluation of their microwave dielectric properties is the basis for practical applications. The resonant cavity method and the parallel plate method are general methods for testing the microwave dielectric properties of low-loss materials. Both methods are based on the principle of microwave dielectric resonance and adopt TE 011 Resonant mode (TE in resonant cavity method 011 mode aka TE 01δ model). All microwave dielectric resonance systems are multi-resonance mode systems, so TE 011 The correct identificati...
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Login to View More IPC IPC(8): G01R27/26
CPCG01R27/2688
Inventor 李雷王璇陈湘明
Owner ZHEJIANG UNIV