Research on a Photonic Crystal Resonator for Millimeter-wave Dielectric Properties Measuring of Materials
In the application of microwave energy,the dielectric property of material is an important characteristic,which determines the ability of material to be processed by microwave.In order to study the application of microwave energy in millimeter-wave frequency domain,a photonic crystal resonator for measuring the dielectric properties of materials in millimeter-wave is studied.The resonator is based on a photonic crystal structure with triangular lattice distribution,and the band gap of the designed dielectric photonic crystal ranges from 87 GHz to 107 GHz.On this basis,a dielectric photonic crystal waveguide di-rectly connected to the WR-10 waveguide is formed by adding line defects and two conical structures,with a passband range of 88 GHz-99 GHz.A through hole with diameter of 0.51 mm is added at the center of the dielectric photonic crystal waveguide to form a photonic crystal resonator.When a material is put into the central hole of the resonator,the dielectric constant of the material will affect the resonant frequency of the resonator.By measuring the change of the resonant frequency,the dielectric constant of the material in the frequency range of 88 GHz-99 GHz can be calculated.Through the CST simulation,the designed structure can be used to test high dielectric constant materials,and the dielectric constant of the measura-ble materials is ranged from 67 to 94.5.
Photonic crystalDielectric constantResonant frequency
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