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 _    _     ______     _____     ___     _    _   
| || | ||  /_   _//   / ___//   / _ \\  | || | || 
| || | ||   -| ||-    \___ \\  / //\ \\ | || | || 
| \\_/ ||   _| ||_    /    // |  ___  ||| \\_/ || 
 \____//   /_____//  /____//  |_||  |_|| \____//  
  `---`    `-----`  `-----`   `-`   `-`   `---`

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Text this: Periodically slotted microstrip ring resonator