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WR-821 is a type of waveguide used in microwave engineering, specifically designed for frequencies within the 18 to 26.5 GHz range. It is often used in applications such as radar, satellite communications, and other high-frequency transmission systems. The designation "WR" stands for "waveguide rectangular," and the number indicates its specific dimensions and frequency range. These waveguides facilitate the efficient transmission of microwave signals with minimal losses.
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