標題: | Leaky wave phenomena of a conductor-back dielectric slab covered with a two-dimensionally electromagnetic band gap superstrate |
作者: | Hwang, R. B. 電信工程研究所 Institute of Communications Engineering |
公開日期: | 18-七月-2007 |
摘要: | [1] This paper presents the leaky wave phenomena associated with a waveguide structure that consists of a conductor-back dielectric slab covered with a superstrate made up of a two-dimensionally ( 2-D) electromagnetic band gap ( EBG) structure. A guided wave has its energy bounced back and forth between the metallic ground plane and the EBG structure that is taken as a frequency-selective reflection mirror. Because of the finite thickness of the 2-D EBG superstrate, the guided wave will leak or radiate some of its energy into the air region above the waveguide structure to become a leaky wave. By the mode-matching method and the transverse resonance technique, the overall waveguide structure is formulated as a rigorous electromagnetic boundary value problem to yield an exact dispersion relation of the waveguide so that the complex propagation constant of a guided mode can be accurately determined, including the phase and attenuation constants. Additionally, the electric field distribution inside the waveguide and the far-field radiation pattern were also calculated to demonstrate the leaky wave phenomena of this waveguide from a microscopic point of view. On the basis of the excitation of leaky waves, the phenomenology concerning a class of directive antennas with EBG structure as superstrate was clarified in this research. |
URI: | http://dx.doi.org/10.1029/2005RS003445 http://hdl.handle.net/11536/10554 |
ISSN: | 0048-6604 |
DOI: | 10.1029/2005RS003445 |
期刊: | RADIO SCIENCE |
Volume: | 42 |
Issue: | 4 |
結束頁: | |
顯示於類別: | 期刊論文 |