Metamaterial-Inspired Microwave Passive Devices

Abstract

This thesis aims to provide the geometrical-based equivalent circuit models for different resonator-coupled transmission lines (TL). These models are derived from the general multi-mode cross-junction by applying the appropriate boundary conditions. This methodology successfully produced the models of several structures such as strip-loaded slotline, strip and Split Ring Resonator (SRR) -loaded Coplanar Waveguide (CPW), in addition to the investigation of the CPW odd mode strip-loading. These models have led to the development of a range of applications spanning low-pass filters, slow-wave structures, wideband Composite Right Left Handed (CRLH) TL and compact planar air-bridge free CPW Wilkinson Power Dividers (WPD). For the complementary structures, the investigated models are the Defected Ground Structure (DGS), Complementary Split-Ring Resonator (CSRR) loaded microstrip (MS), and DGS coupled lines, and their applications to directional couplers.