Ultra-thin and conformal SSPP based UWB low pass filter for B5G Radio Stripe Networks

This paper proposes a new design of ultra-thin and conformal SSPP based ultra wide band (UWB) low pass filter (LPF) employing the theory of spoof surface plasmon polaritons (SSPPs). The structure is made up of microstrip line corrugated with rectangular grooves which are loaded with equilateral triangle on both sides of the substrate. The thickness of the conformal SSPP filter is very small of the order of few micrometer and hence referred as nearly zero thickness metal strips resulting in a strong confinement over a wide frequency range. It has been identified that the designed filter has an UWB performance and its cut-off frequency can be easily controlled by changing the depth of the groove and spacing of the corrugations. The simulated results show a −10 dB bandwidth from 0 GHz to 11.96 GHz with a rejection level of 65 dB at 13.6 GHz. The proposed conformal UWB LPF can be extensively used in radio stripe networks for next generation beyond 5G applications.