介质/金属波导在G波段的损耗和色散特性

Loss and Dispersion Properties of Dielectric-Coated Metallic Waveguide in G-Band

仿真研究了介质/金属波导在140~220 GHz频段的损耗和色散特性。在该频段,当传输波长接近波导尺寸时,介质层不能降低传输损耗,但介质层导致模场结构发生变化,波导的色散进入负值区间。分析总结了具有不同介质层厚度的介质/金属波导的色散特性变化和零色散位置。提出了利用不同介质层厚度的波导对金属波导进行色散补偿的方法和方案。结果表明,通过色散补偿可以实现在不同频点的零色散特性,也可以实现一定频段范围内的平坦低色散特性。研究结果对该频段波导的结构设计和制作工艺等具有指导意义。

Loss and dispersion characteristics of dielectric-coated metallic hollow waveguides are simulated for frequencies ranging from 140 GHz to 220 GHz. Results show that the dielectric layer coating cannot reduce the transmission loss in this frequency band when the operation wavelength is close to the inner diameter of the waveguide. However, the electric field profile of the model is distorted because the dielectric layer and dispersion of the waveguide switches from positive to negative. The dispersion variation and zero-dispersion position in dielectric-coated metallic hollow waveguides with different dielectric layer thicknesses are analyzed and summarized. Dispersion compensation methods and schemes for metal waveguides are proposed using waveguides with different dielectric layer thicknesses. The result shows that zero-dispersion can be achieved at different frequencies and flat and low dispersion over specific frequency bands can be realized. It guides structural design and fabrication parameter control for the waveguides used in this frequency band.