Question

Why do we need waveguide antenna at high frequency than normal antenna

Answer 1

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Waveguides are often used at microwave frequencies (greater than 300 MHz, with 8 GHz and above being more common). Waveguides are wideband devices, and can carry (or transmit) either power or communication signals. ... Waveguides can bend if the desired application requires it, as shown in the following Figure.

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