# Transmission Coefficient - Microwave Transmission Lines - Microwave Engineering | Summary and Q&A

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April 5, 2022
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Ekeeda
Transmission Coefficient - Microwave Transmission Lines - Microwave Engineering

## TL;DR

This video discusses the analysis of reflection and transmission coefficients in microwave transmission lines.

## Key Insights

• 🫥 Properly terminated transmission lines have no reflected energy, only forward-traveling waves.
• 🫥 Improperly terminated transmission lines have both forward-traveling and reflected waves.
• 💁 The reflection coefficient provides information about the amount of energy reflected due to impedance mismatch.
• 🫥 The transmission coefficient determines the efficiency of power transmission in the microwave transmission line.
• 🫥 The relationship between reflection and transmission coefficients helps analyze power transmission in the transmission line.
• 🫥 Characteristic impedance plays a crucial role in determining the termination status of a transmission line.
• 😑 The transmission coefficient can be expressed as a ratio of load impedance to the sum of load and characteristic impedances.

## Questions & Answers

### Q: What is the importance of characteristic impedance in microwave transmission lines?

The characteristic impedance helps determine whether a transmission line is properly terminated or not. If it matches the load impedance, the line is properly terminated, resulting in no reflected energy.

### Q: How is the reflection coefficient defined?

The reflection coefficient evaluates the ratio of the reflected energy to the incident energy in a transmission line. It provides information about the amount of energy reflected due to impedance mismatch.

### Q: What is the transmission coefficient?

The transmission coefficient represents the ratio of the transmitted voltage or current to the incident voltage or current in a microwave transmission line. It quantifies the efficiency of power transmission.

### Q: How are reflection and transmission coefficients related?

The reflection and transmission coefficients are interconnected through a relationship where 1 minus the reflection coefficient squared is equal to (characteristic impedance/load impedance) multiplied by the transmission coefficient squared.

## Summary & Key Takeaways

• The video explains the concept of characteristic impedance in properly terminated microwave transmission lines.

• It describes the reflection coefficient and its relationship with the incident and reflected energy.

• The video also introduces the transmission coefficient and its importance in determining the power transmitted in the microwave transmission line.

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