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 (ε_eff, μ_eff), refractive index (n), propagation constant (β) and Bloch impedance (Z_B) 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.