Title :
New interpretation of wave propagation in high impedance surfaces
Author :
Ramprasad, R. ; Petras, M.
Author_Institution :
Dept. of Mater. Sci. & Eng., Connecticut Univ., Storrs, CT, USA
Abstract :
A general framework based on a 4-port, 2-layer circuit model has been developed to describe surface wave propagation in periodic surfaces. For the specific case of high impedance surfaces, a new mechanism for the occurrence of electromagnetic band gaps is presented based on eigenmode analysis. It is shown that the eigenmode of a surface electromagnetic wave at any given frequency can be written as a linear combination of two "pure" modes: a backward wave mode that propagates primarily within the surface, and a forward wave mode that resides primarily on the surface. At the band gap frequencies, the two pure modes couple so as to result in no propagation. It is anticipated that the circuit model developed as part of this work will be a powerful tool fore understanding and exploration of a large class of periodic systems.
Keywords :
coupled mode analysis; eigenvalues and eigenfunctions; electromagnetic wave propagation; periodic structures; photonic band gap; surface electromagnetic waves; 4-port 2-layer circuit model; backward wave mode; coupled mode analysis; eigenmode analysis; electromagnetic band gap; forward wave mode; high impedance surfaces; left-handed media; loaded transmission lines; periodic structures; periodic surfaces; surface electromagnetic wave propagation; surface wave propagation; Dielectric materials; Electromagnetic propagation; Frequency; Lattices; Metamaterials; Optical surface waves; Periodic structures; Photonic band gap; Surface impedance; Surface waves;
Conference_Titel :
Microwave Symposium Digest, 2005 IEEE MTT-S International
Print_ISBN :
0-7803-8845-3
DOI :
10.1109/MWSYM.2005.1517056