Analysis and design of the CRLH SICL unit cell using effective parameters

Abstract

This article proposes a substrate integrated coaxial line (SICL) structure with composite right left handed (CRLH) characteristics. The CRLH characteristics were implemented by inserting an inter-digital capacitor (IDC) and strip line into the SICL. To verify the proposed CRLH structure, the effective parameters (εeff, μeff), refractive index (n), propagation constant (β) and Bloch impedance (ZB) were derived using the retrieved effective parameter method, from which left-handed (LH), right-handed (RH), zeroth-order resonance (ZOR) characteristics were confirmed. After completing the CRLH-equivalent circuit from the effective parameters, the component values were validated by comparing the results of a simulation model and a circuit model. The simulation results agreed well with the measured results. This confirmed that the proposed SICL is a balanced CRLH SICL unit cell.