1、Cutoff frequency of waveguide:
(m for x-axis, n for y-axis)
TE_{m,n}\rightarrow f_{c}(m,n)=\frac{1}{2\pi\sqrt{\mu\epsilon}}\sqrt{(\frac{m\pi}{a})^2+(\frac{n\pi}{b})^2}
(m for x-axis, n for y-axis)
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