High Permittivity Tape Transmission Line for Mass-Productive Dielectric Waveguide at Millimeter-Wave Frequencies

A new transmission media using high permittivity dielectric materials was proposed for mass productivity of dielectric waveguides. This guide consists of a tape-shaped high permittivity dielectric material inserted in the horizontal mid-plane of a below cutoff parallel metal waveguide. It was obvious that this guide exhibited flat dispersion characteristics in a limited bandwidth. The transmission loss was hard to be affected by a loss tangent of the high permittivity material, and thus the low loss performance was exhibited. Assuming the relative dielectric constant of the high permittivity dielectric material to be 200, the single mode bandwidth was calculated to be 40 GHz at a center frequency of 40 GHz, and the transmission loss was estimated to be less than 13 dB/m.