Frequency-adjustable complex dielectric constant test system and method based on reentrant coaxial cavity
A complex dielectric constant and testing system technology, which is applied in the direction of dielectric property measurement, measuring devices, and measuring electrical variables, etc., can solve problems such as the inability to achieve continuous frequency sweep, and achieve the effects of easy installation, high detection accuracy, and simple operation
Active Publication Date: 2021-12-03
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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A microwave resonator is a microwave component with energy storage and frequency selectivity, which is used in the resonance method; however, compared with the network parameter method, although the resonance method has a higher test accuracy, it can only be used for a single resonance point frequency. The complex dielectric constant of the material to be tested is tested, and continuous frequency sweeping cannot be achieved
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[0027] Embodiments of the present invention are described below through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation modes, and various modifications or changes can be made to the details in this specification based on different viewpoints and applications without departing from the spirit of the present invention.
[0028] This embodiment provides a frequency-tunable complex permittivity testing system based on a reentrant coaxial cavity, and its structural diagram is as follows figure 1 As shown, it specifically includes: frequency modulation module and microwave test module;
[0029] The microwave test module includes: a reentrant coaxial cavity, a coupling regulator (7a, 7b), an amplitude and phase test module (8), a program-controlled compute...
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The invention belongs to the technical field of microwave material dielectric performance testing, and specifically provides a frequency-adjustable complex dielectric constant testing system and method based on a reentrant coaxial cavity, which is used to overcome the traditional resonance method that can only be used at a single resonance point frequency. The complex dielectric constant of the measured material is tested, and continuous frequency sweeping cannot be achieved. The present invention adopts the reentrant coaxial cavity, utilizes the ring-shaped medium disturbance block inside the cavity to disturb the field in the cavity, and realizes the adjustable frequency reentrant coaxial cavity; and according to the frequency adjustable reentrant coaxial cavity The function η(h) of the position h of the annular disturbance block in each resonance mode and the proportional coefficient η in the perturbation formula, as well as the resonant frequency and quality factor before and after loading the sample to be tested in the frequency-tunable reentrant coaxial cavity, using the perturbation algorithm Calculate the complex dielectric constant of the sample to be tested; that is, the present invention can realize the measurement of the complex dielectric constant of the sample to be tested within a certain frequency range, and the test system is easy to install, simple to operate, and high in detection accuracy.
Description
technical field [0001] The invention belongs to the technical field of microwave material dielectric property testing, and specifically provides a frequency-adjustable complex dielectric constant testing system and method based on a reentrant coaxial cavity. Background technique [0002] At present, my country's material technology is developing at an unprecedented speed, especially in the field of electronics, various materials are widely used in aerospace, wireless communication and electromagnetic wave detection and other fields. In terms of low-frequency detection theory and methods, military P-band radar communication and radar stealth, ground-penetrating radar and its imaging technology, biomedicine, environmental protection, food safety detection, etc., the different types of materials used in them are reviewed. There is an extremely urgent need for high-precision measurement of electrical constants, and the existing technical methods mainly use the capacitance method...
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IPC IPC(8): G01R27/26
CPCG01R27/2617G01R27/2647G01R27/2688
Inventor 余承勇李恩彭亦童龙嘉威李亚峰贺剑孙周李灿平
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA