Design and simulation of 1THz hybrid transmission structure based on a polymer

In view of the problems of large transmission loss and high processing accuracy requirements of the traditional transmission structure in the THz frequency band, this paper proposes a hybrid transmission structure based on a polymer-supported suspended microstrip and a waveguide cavity. This structure reduces the THz signal plane transmission time. The loss increases the physical size to the greatest extent, ensures the signal single-mode transmission and reduces the process difficulty of cavity processing, making it possible to transmit low-loss planar transmission of terahertz signals greater than 1THz. In this paper, a high-frequency electromagnetic simulation of the transmission characteristics of this structure in the 0.75–1.1THz frequency band is conducted. In the case of a shielding cavity size of 60umX70um, the loss is 48-60Np/m, and the S12 is −1.88-2.8dB. Similar to the air dielectric strip line, it is far superior to the 3um thin film microstrip transmission structure. In this paper, the structures of four different media are simulated and compared, and the influence of the position of the supporting metal in the structure on the transmission characteristics is also discussed in detail. The proposal of this structure is expected to solve the problem of excessive transmission loss of TMIC circuits greater than 1THz, and provide strong support for the future design and manufacture of TMIC circuits.