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

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Text this: Periodically slotted microstrip ring resonator