notes 14 3317.pptx - ECE 3317 Prof Ji Chen Spring 2018 Notes 14 Transmission Lines(Radiation and Discontinuity Effects 1 Radiation and Discontinuity

notes 14 3317.pptx - ECE 3317 Prof Ji Chen Spring 2018...

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Prof. Ji Chen Notes 14 Transmission Lines (Radiation and Discontinuity Effects) ECE 3317 1 Spring 2018
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Radiation and Discontinuity Effects At high frequency, radiation effects can become important. Z g z Sinusoidal source Z L z = 0 Z 0 S When will radiation occur? What about reflections from discontinuities (e.g., bends or objects near the line)? We want energy to travel from the generator to the load, without radiating. 2
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Radiation (cont.) The discussion here will focus on two common types of transmission lines, coaxial cable and twin lead, but the discussion is general and applies to other similar types of lines. 3 Coaxial cable Twin lead
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Coaxial Cable a b z The coaxial cable is a perfectly shielded system – there is never any radiation at any frequency, or under any circumstances. The fields are confined to the region between the two conductors. 4 Assumption: The conductor thickness is large compared to a skin depth.
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