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    ___    /_   _//     ___     / _ \\   |  _ \\  
   /   ||   -| ||-     /   ||  / //\ \\  | |_| || 
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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