Text this: Electromagnetic theory for microwaves and optoelectronics . (2nd ed.)

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|      \\  /_   _//  | \| || | || | || | || | || 
|  --  //   -| ||-   |  ' || | || | || | || | || 
|  --  \\   _| ||_   | .  || | \\_/ || | \\_/ || 
|______//  /_____//  |_|\_||  \____//   \____//  
`------`   `-----`   `-` -`    `---`     `---`