EEE445_Lectr27_coupled_line

EEE445_Lectr27_coupled_line - 7.6 Coupled Line Directional...

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Lecture 27 7.6 Coupled Line Directional Couplers Side-by-side coupler Realizable in both stripline and microstrip Over/under coupler Realizable in stripline only 1 EEE 591/445 Lecture 27
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Lecture 27 Two-Conductor Transmission Line Concepts Assume line is lossless: LC v LC v C L Z C L ϖ β = = = = = = 1 length unit per e capacitanc length unit per inductance 0 2 EEE 591/445 Lecture 27
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Lecture 27 Evaluation of Characteristic Impedance and Phase Constant Obtain the static capacitance per unit length of the actual transmission line ( C ) Obtain the static capacitance per unit length of the structure with the dielectric removed ( C 0 ) Evaluate the effective dielectric constant 0 C C e = ε 3 EEE 591/445 Lecture 27
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Lecture 27 Evaluation of Characteristic Impedance and Phase Constant Calculate the phase velocity Calculate the phase constant e p c v ε = p v ϖ β= 4 EEE 591/445 Lecture 27
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Lecture 27 Evaluation of Characteristic Impedance and Phase Constant Evaluate the characteristic impedance C v Z p 1 0 = 5 EEE 591/445 Lecture 27
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Lecture 27 Even/odd mode decomposition of side-by-side Coupled lines 6 EEE 591/445 Lecture 27
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Lecture 27 Two-line case Even mode Odd mode Phase velocities of e/o are different
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EEE445_Lectr27_coupled_line - 7.6 Coupled Line Directional...

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