High-order Mode of Spoof Surface Plasmon Polaritons based on a Novel Compact Structure and its Application in Band-pass Filters
DOI:
https://doi.org/10.13052/2024.ACES.J.390403Keywords:
band-pass filter, bow-folded strip, novel compact, SSPPsAbstract
In this paper, two band-pass filters based on the high-order mode of spoof surface plasmon polaritons (SSPPs) are introduced. A novel compact bow-folded strip is proposed as a cell, which exhibits perfect band-pass characteristics. By adjusting the width and groove of the bow-folded strips, high-order mode can be obtained to support the design of band-pass filters. Compared to the conventional single-side rectangular groove SSPPs cell, our proposed bow-folded strip structure cells reduce the electrical size by 59% and 70% at the same cut-off frequency. In addition, the transmission lines of the two proposed band-pass filters are microstrip lines and their over-conversion structures are simple trapezoidal over. A single-band and a dual-band band-pass filters using the proposed SSPPs cell are fabricated and measured, both having almost the same size. The measured results are in good agreement with simulated results, which verify the feasibility of our design.
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