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  ______    ______   _    _     _____     _  _   
 /_____//  /_   _// | \  / ||  |  ___||  | \| || 
 `____ `    -| ||-  |  \/  ||  | ||__    |  ' || 
 /___//     _| ||_  | .  . ||  | ||__    | .  || 
 `__ `     /_____// |_|\/|_||  |_____||  |_|\_|| 
 /_//      `-----`  `-`  `-`   `-----`   `-` -`  
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Text this: A Ka-band rectangular waveguide to microstrip transition using SIR coupling slot with LTCC technology