The Investigation of Tightly Packed Spoof Surface Plasmon Polaritons Waveguides with Novel Layouts

Abstract

Integrated circuits (ICs) have so many advantages, such as small volume, high reliability and good performance to make it outstanding in the practical use. However, the miniaturization makes a great challenge to the signal integrity and interference suppression in ICs. Owing to the extraordinary characteristics of filed confinement and enhancement, natural surface plasmon polaritons (SPPs) at optical frequency would have potential ability to solve the aforementioned problem between miniaturization and signal integrity of ICs design. And the presentation of spoof SPPs at microwave frequency with subwavelength effect makes the idea feasible. In this paper, we proposed three different layouts of two tightly packed spoof SPPs waveguides with deep-subwavelength separation to imitate the arrangement of wires in ICs. We mainly focus on the coupling parameter of the four-port packed spoof SPPs waveguides, and make a compare with the traditional microstrip line. The optimal arrangement and separation of spoof SPPs waveguides with the lowest crosstalk whose coupling parameter remains below −20 dB in the whole transmission band have been found that could be applied in the ICs based on the SPP mode.