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β cut offDari persyaratann ω c < β < n / c3/2ωsuatu modus disebut terpandu jika β m>β cut offβcutoff= n3ω/ c atau p=0Harga cut off dari t/λ:p + q1 ⎡tan( ht)=→ ( t / λ)=⎢ + tan2 TEmπh(1− pq / h )2 22πn − ⎢2n3⎣−1⎛⎜⎝nn2322−−nn2123⎞⎟⎠1/ 2⎤⎥⎥⎦p + q1 ⎡tan( ht)=→ ( t / λ)=⎢ + tan2 TMmπh(1− pq / h )2 22πn − ⎢2n3⎣−1nn2221⎛⎜⎝nn2322−−nn2123⎞⎟⎠1/ 2⎤⎥⎥⎦112

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