<i>W</i>-Band <i>E</i>-Plane Waveguide Bandpass Filters Using Spoof Surface Plasmon Polaritons and Grounded Lines
Yiqun Liu, Kai‐Da Xu
Abstract
A new design method of <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">W</i> -band <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">E</i> -plane waveguide bandpass filters (BPFs) has been reported in this article. The proposed design method is implemented by inserting dielectric substrates into standard rectangular waveguides to form millimeter-wave BPFs, where spoof surface plasmon polariton (SSPP) patterns and grounded lines are coated on the frontsides and backsides of inserted dielectric substrates. Using the proposed method, the upper and lower cut-off frequencies of millimeter-wave <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">E</i> -plane waveguide BPFs can be flexibly and independently controlled by adjusting the dimensions of SSPP patterns and grounded lines, whose working mechanism is clearly investigated and described in this article. To verify the feasibility of the proposed design method, two different <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">W</i> -band <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">E</i> -plane BPFs using SSPPs and grounded lines are designed, fabricated, and measured, respectively. Good agreement between measurement and simulation indicates that the proposed design method is feasible and has potential for millimeter-wave applications.