Analysis and design of a dielectric insular image guide

In this article, a detailed theoretical analysis of the dielectric insular image guide (DIIG) is presented to provide a solution for low‐loss millimeter‐wave (mm‐wave) transmission lines. The effective dielectric constant method is utilized to design a DIIG prototype in the Ka‐band, which is then fabricated using a standard low temperature cofired ceramic technique. Results from measurements agree well with theoretical calculations and simulations. A loss of 0.012 dB/mm at 35 GHz is achieved, which indicates great potential for further development to realize highly integrated low‐loss mm‐wave components and systems.