Low-loss LTCC-based gap waveguide feeding network for W-band application

In this paper, a novel low-loss gap waveguide (GWG) transmission line with Low Temperature Co-Fired Ceramic (LTCC) technology for W-band is presented. To illustrate the low-loss characteristics of the proposed line, microstrip line (MSL) and laminated waveguide (LWG) are also designed with LTCC, and the corresponding measured values of insertion loss are given. From the measured results, the value of the dielectric loss tangent is extracted. As an example, two kinds of eight-way power dividers are shown, which are composed of LWG and GWG, respectively. Simulated results of transmission and reflection coefficients are presented. Comparison of two power dividers has shown the low-loss superiority of the new design.