161_1_Lecture_12

161_1_Lecture_12 - EE161 El EE161 Electromagnetic Waves...

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EE161 Electromagnetic Waves all 2010 Fall, 2010 Instructor: Dr. Shenheng Xu Electrical Engineering Dept., UCLA gg p , © Prof. Y. Ethan Wang
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ecture 2 Lecture 12 • Transmission Line Resonator • Rectangular Waveguide Cavity • Waveguide Excitation
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Transmission Line Resonator Resonance: Self sustaining of electromagnetic energy in waveguide structures at certain discrete frequencies Open ended transmission line maximum energy accumulation & absorption open open When , resonance will happen! n d 2 d Equal Phase Analysis  open open   0 o 180 o 180 o 360 o 0 o 180 o 360 o 180 o (0 o ) 0 o 360 o (0 o )
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Transmission Line Resonator General Case Resonance Condition: * II I (first order approximation when (I) (II) Z 1 Z 2 I in II in in in So the total transfer phase is z1 and z2 are not very different) jX 1 jX 2 o 2 0 ) ( I in II in I in Exercises:  0 o 90 o 270 o 360 o  0 o 180 o 360 o 180 o 0 o 180 o No resonance! Yes resonance!
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ectangular Waveguide Cavities Rectangular Waveguide Cavities y
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161_1_Lecture_12 - EE161 El EE161 Electromagnetic Waves...

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