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A new water-based waveguide absorptive switch is developed and reported. The switch functions by controllably inserting water inside a conventional Ka-band waveguide. In particular, three Teflon-made circular cylinders with a diameter of 1.59-mm are placed inside a 50-mm-long waveguide section at an angle of 75° and can be filled with water by micropumps. The water-filled tubes offer a measured isolation...
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