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             ___      ____       ___      ____    
  ____      / _ \\   |  _ \\    / _ \\   |  _ \\  
 |    \\   / //\ \\  | |_| ||  / //\ \\  | |_| || 
 | [] ||  |  ___  || | .  //  |  ___  || | .  //  
 |  __//  |_||  |_|| |_|\_\\  |_||  |_|| |_|\_\\  
 |_|`-`   `-`   `-`  `-` --`  `-`   `-`  `-` --`  
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發送短信 : Radiation of open-ended waveguides through a multi-layer superstrate