Metamaterial-Based Wideband Dual Stop-Band Filters for V-Band Radars

This paper presents a methodology for designing a compact wideband dual stop-band filter by cascading transmission zeros using Electric-LC (ELC) resonators in coplanar waveguide (CPW) technology on a silicon substrate. Traditional filter design often relies on full-wave simulations and optimization processes, which are computationally intensive. Instead, the proposed approach simplifies the design process by numerically characterizing individual ELC resonator pairs and constructing a database of scattering parameters (<tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$S$</tex> matrices) corresponding to different geometrical configurations. By selecting and cascading appropriate <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$S$</tex> matrix blocks, both the lower and upper stopbands of the filter can be synthesized with significantly reduced simulation time. Experimental validation was performed on a fabricated filter (with a <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$61-70 \text{GHz}$</tex> passband), showing good agreement with numerical predictions, despite minor discrepancies attributed to loss effects not fully reproduced in the simulation environment.