Design and Modeling of Spoof Surface Plasmon Modes-Based Microwave Slow-Wave Transmission Line

Abstract

This paper presents a theoretical model and validates experimentally the microwave slow-wave transmission line (SW-TL) based on spoof surface plasmon (SSP) modes. Equivalent circuit models are first presented for characterizing the SSP structures and developed to serve as an insightful guideline to design the SW-TL at a given cutoff frequency and Bloch impedance. A mode converter connecting a conventional microstrip transmission line to the SW-TL is necessarily proposed to ensure that the quasi-TEM modes of the microstrip line are gradually transformed to the operating TM modes of the SW-TL. The presented schematic of SW-TL paves a promising avenue for the unprecedented interconnector footprint miniaturization of integrated circuits, and the enhanced electromagnetic compatibility, for example, in multilayered monolithic microwave integrated circuits.

Design, Analysis and Characterisation of Spoof Surface Plasmon Polaritons based Wideband Bandpass Filter at Microwave Frequency

“…The characterisation of the fabricated filter has been carried out by Rohde & Schwarz vector network analyser ZvA24. The proposed SSPP BPF size is half in length compare to earlier reported work 24 having length (180 x 45) mm approx.…”

“…1, is reported to offer general understanding of spoof surface plasmon polariton transmission line (SSPP-TL) 24 . The dimensions of reported unit cell are a = 1 mm, b = 2 mm, h = 4 mm, d = 5 mm.…”

“…8 is simulated in CST software tool having substrate RT duriode 5880, it is observed For highly efficient conversion, it is essential to match two transmission structures in term of momentum and impedance 28 . A broadband and an efficient conversion from conventional guided waves to SSPP in the microwave frequency have been proposed 24 (in which three element strip connector and ground regulator is proposed). The transition is further optimised (ground at bottom) for the new proposed unit cell, as shown in Fig.…”

A Novel Broadband Band-pass Filter Based on Spoof Surface Plasmon Polaritons

“…Since the spoof waveguide transmits the wave by coupling between the grooves, its equivalent model can be analyzed by using the transmission line model3637 by considering a very far ground plane at infinity. Based on this definition, we can calculate the capacitors which connect the line to the ground36. This model matches the conventional cases and one can thus use the impedance, scattering and ABCD matrix definitions.…”

Microwave index engineering for slow-wave coplanar waveguides

“…In the microwave field, slow-wave CPWs are used to design new compact delay lines 6 , phase shifters or microwave filters 7–11 with an important size reduction in comparison with regular CPWs. In plasmonics, slow-wave CPWs have been used for designing and modelling new spoof surface plasmon modes 12–14 . Moreover the management of the microwave index as well as the impedance is an essential target in metamaterials 15,16 with several applications like compact multilayer transmission lines, negative and zero order resonator or lens design among others 16,17 .…”