Resonant cavity special for testing decimeter wave dielectric medium capable of adding DC bias and testing method thereof

Abstract

This invention relates to a kind of test using resonant cavity for decimetric wave dielectric which can apply direct-current blasing and testing method. The invention belongs to open circuit coaxial line - capacitance clearance resonant cavity; running frequency is 0.2 to 1 GHz. Between bottom end cover of coaxial cavity and internal conductor there is a tubular insulator, forming a small volumetric cirque capacitance, to realize open circuit state of coaxial line lower end. Thus can apply direct-current blasing apply on sample. Upper end cover of coaxial cavity and internal conductor compose 0 to 6mm adjustable capacitance clearance, can measure media sample that has different thickness and diameter, and has 1.5 to 13.5pF capacitance. Designing different coaxial line length can take the measurements under one to four point's frequency. Measuring every resonant frequency and corresponding carrying Q factor of resonant cavity containing or not containing sample, by relate formulae to abstract complex dielectric constant. This system has no parasitic resonance, owing to misproportion characteristic of sample radial electric field, so be able to measuring microwave parameter of stuff which relative dielectric constant as high as 100 .

Description

technical field [0001] The invention relates to a special resonant cavity for testing dielectric materials and a testing method using the resonant cavity, in particular to a special resonant cavity for testing decimeter wave dielectrics and a test method for dielectric materials in the 200-1000 MHz frequency band and capable of applying a DC bias voltage. method. technical background [0002] At the low end of the microwave frequency, it is the application frequency band of communication, radio, television, warning radar, etc. No matter on the ground or on the satellite, a large number of microwave devices such as high-power filters, dual (multi) power devices, power splitters, directional couplers, etc. made of ceramic dielectrics are needed. For example, the base station of cellular mobile communication operates in a high-power state, and only a medium with a small dielectric constant to electric field strength can produce a duplexer with a low cross-modulation distortion...

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Problems solved by technology

However, there are few reports on microwave dielectric parameter testing devices that can apply DC bias

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