Broadband Artificial Magnetic Conductors Constructed of Magnetically Coupled Elements

Abstract

An Artificial Magnetic Conductor (AMC) is a type of metamaterial that can be used to enhance the performance in several antenna and microwave design applications. In this work we propose an analytical approach for size and bandwidth optimization of AMCs constructed of magnetically coupled elements Numerical results (obtained using COMSOL) for the optimized structure demonstrate performance close to the theoretical limit.

Near-field electromagnetic coupling between helices

“…The use of helices with different handedness provides greater control over coupling values for a set distance between elements that may be used in cases where an exact value of coupling is required to obtain the theoretical maximum performance, for instance, the design of artificial magnetic conductors [21]. The analytical approach that may be used to find the coupling coefficients required for a particular AMC response is found in [28]. In addition to this, knowledge of particular coupling values may be used to optimise the response of structures where different handed helices are used to provide metamaterial absorbers [15,17,18] or polarization converters [19].…”