Time-domain measurement of negative group delay in negative-refractive-index transmission-line metamaterials

被引：74
|
作者：
Siddiqui, OF [1 ]
Erickson, SJ [1 ]
Eleftheriades, GV [1 ]
Mojahedi, M [1 ]
机构：
[1] Univ Toronto, Dept Elect & Comp Engn, Toronto, ON M5S 3G4, Canada
来源：
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES | 2004年 / 52卷 / 05期
基金：
加拿大自然科学与工程研究理事会;
关键词：
anomalous dispersion; coplanar waveguide (CPW); metamaterials; negative group delay (NGD); negative group velocity (NGV); negative refractive index (NRI);
D O I：
10.1109/TMTT.2004.827018
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
We have simulated and constructed a One-di-mensional metamaterial composed of a periodically loaded transmission line that exhibits both negative and positive. group velocities in a hand of effective negative index of refraction. The negative group velocity or, equivalently, the negative group delay, is demonstrated theoretically and experimentally in the time domain using modulated Gaussian pulses. Due to this negative delay, we can show an output pulse peak emerging from the loaded transmission line prior to the input peak entering the line, i.e., the output pulse precedes the input pulse. The fact that this surprising behavior does hot violate the requirements of relativistic causality is illustrated with time-domain simulations, which show that discontinuities in the pulse waveforms are traveling at exactly the speed of light in vacuum. The pulse-reshaping mechanism underlying this behavior is also illustrated using time-domain simulations.
引用
收藏
页码：1449 / 1454
页数：6
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