Title :
Efficient modeling of novel uniplanar left-handed metamaterials
Author :
Guo, Yunchuan ; Goussetis, George ; Feresidis, Alexandros P. ; Vardaxoglou, John C.
Author_Institution :
Wireless Commun. Res. Group, Loughborough Univ., UK
fDate :
4/1/2005 12:00:00 AM
Abstract :
This paper presents an efficient modeling technique for the derivation of the dispersion characteristics of novel uniplanar metallodielectric periodic structures. The analysis is based on the method of moments and an interpolation scheme, which significantly accelerates the computations. Triangular basis functions are used that allow for modeling of arbitrary shaped metallic elements. Based on this method, novel uniplanar left-handed (LH) metamaterials are proposed. Variations of the split rectangular-loop element printed on grounded dielectric substrate are demonstrated to possess LH propagation properties. Full-wave dispersion curves are presented. Based on the dual transmission-line concept, we study the distribution of the modal fields and the variation of series capacitance and shunt inductance for all the proposed elements. A verification of the left-handedness is presented by means of full-wave simulation of finite uniplanar arrays using commercial software (HFSS). The cell dimensions are a small fraction of the wavelength (approximately λ/24) so that the structures can be considered as a homogeneous effective medium. The structures are simple, readily scalable to higher frequencies, and compatible with low-cost fabrication techniques.
Keywords :
dielectric materials; dispersion (wave); interpolation; metamaterials; method of moments; periodic structures; transmission line theory; wave functions; HFSS commercial software; LH propagation properties; Rao Wilton Glisson basis function; arbitrary shaped metallic elements; dispersion characteristics; dual transmission-line concept; finite uniplanar arrays; full-wave dispersion curves; full-wave simulation; grounded dielectric substrate; homogeneous effective medium; interpolation method; left-handedness verification; method of moments; modal field distribution; series capacitance variation; shunt inductance variation; split rectangular-loop element; triangular basis functions; uniplanar left-handed metamaterials; uniplanar metallodielectric periodic structures; Acceleration; Capacitance; Dielectric substrates; Frequency; Inductance; Interpolation; Metamaterials; Moment methods; Periodic structures; Transmission lines; Left-handed (LH) materials; Rao–Wilton–Glisson (RWG) basis function; metamaterials; method of moments (MoM);
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
DOI :
10.1109/TMTT.2005.845204