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

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Text this: First-order model of symmetrical six-port microstrip ring coupler