近年来随着毫米波、亚毫米波技术的发展,采用介质波导作为微波传输线又重新引起了人们的兴趣。在毫米波段范围内,金属波导元件不仅价格高,而且随着频率的升高,对加工精度要求也愈来愈高,以致实际上难以达到。而微带集成电路由于高频时导体损耗增大(约0.2分贝/λ_g),一般仅适用在低于K_u波段工作,因此在毫米波段、亚毫米波段采用低损耗的介质波导作为传输线有较多的优点,尤其是可以直接在介质波 In recent years, with the development of millimeter wave and submillimeter wave technologies, the use of dielectric waveguides as a microwave transmission line has rekindled people’s interest. In the millimeter wave band, metal waveguide components are not only expensive, but also require ever higher accuracy with increasing frequency, making them practically difficult to achieve. The microstrip integrated circuits due to high-frequency conductor loss increases (about 0.2 dB / λ_g), generally only applicable to work in the lower than K_u band, so in the millimeter wave band, sub-millimeter wave band low loss dielectric waveguide as the transmission line more The advantages, especially the wave can be directly in the medium