Let λ be the wavelength of an EM wave in empty space.(adsbygoogle = window.adsbygoogle || []).push({});

Let a x 0.5*a be the dimensions of the cross-section of the waveguide.

Can I use a = 0.35*λ ?

It should be possible, it corresponds to θ = π/4, where θ is the effective

angle between the long axis of the waveguide and the direction of propagation

of an approximately plane wave.

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# Size of a waveguide for a given wavelength

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