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

   _____     ___      ______   _    _     _____   
  / ___//   / _ \\   /_   _// | || | ||  /  ___|| 
  \___ \\  / //\ \\  `-| |,-  | || | || | // __   
  /    // |  ___  ||   | ||   | \\_/ || | \\_\ || 
 /____//  |_||  |_||   |_||    \____//   \____//  
`-----`   `-`   `-`    `-`'     `---`     `---`