發送短信 : Design of left-handed materials with broad bandwidth and low loss using double resonant frequency structure

  _  _     ______              _____      _____  
 | \| ||  /_   _//     ___    |  ___||   / ___// 
 |  ' ||   -| ||-     /   ||  | ||__     \___ \\ 
 | .  ||   _| ||_    | [] ||  | ||__     /    // 
 |_|\_||  /_____//    \__ ||  |_____||  /____//  
 `-` -`   `-----`      -|_||  `-----`  `-----`   
                        `-`