Analysis of Square Coaxial Transmission Line With Additive Manufacturing Insulator Support

In this paper, a square coaxial transmission line partially filled with low-cost and additive manufacturing insulator support is presented. Two metal conductors and an insulator fabricated by additive manufacturing make up the proposed coaxial line. Additive manufacturing insulator is used to partially fill the space between two conductors to reduce the dielectric loss. In this case, the relative permittivity and loss tangent are measured, and the insulator is low-cost resin compared with traditional PTFE. The proposed transmission line’s guide-wave characteristics are analyzed. Finally, the analysis is validated by the design and simulation of a transmission line.