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Low-loss Dielectrics |
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A medium is called low loss dielectric if  |
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Under this assumption the attentuation constant becomes |
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And the Phase Constant becomes |
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Note |
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Attentuation constant is almost proportional to the conductivity i.e higher the conductivity more the reduction
in the amplitude of the wave. |
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The phase constant almost same as that of the lossless dielectric. |
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The intrinsic impedance of a medium is |
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For low-loss dielectric the phase of  is almost zero and hence the electric and magnetic fields are almost in
phase with each other. |
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