Abstract
In this work, an effective spoof surface plasmon polariton (ESSPP)-SSPP transmission line (TL) is proposed, which can operate in dual bands. Unlike SSPP TL, our ESSPP-SSPP TL allows for relatively accurate parameter estimation, independent control over each cutoff frequency, and low insertion loss. We provided the dispersion relation and closed-form formulas for calculating each cutoff frequency and explained the mechanism behind the independent controllability of each cutoff frequency. This allows us to quickly estimate the structural parameters with an analytical design approach. By leveraging the dispersion of the ESSPP-SSPP mode, we designed a dual-band filter operating in the millimeter-wave range, and its performance was validated through experimental measurements. This work paves the way for the development of novel SPP-like microwave/millimeter-wave devices.
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