Transmission Lines Concepts

Flashcards covering key concepts related to transmission lines, impedance, and reflections.

Wave Impedance

The ratio of the voltage to the current in a transmission line, defined as Z(d) = V(d)/I(d).

Characteristic Impedance (Zo)

The impedance that characterizes a transmission line, where Zo = √((R + jωL)/(G + jωC)).

Voltage Reflection Coefficient (Γ)

The ratio of the reflected voltage wave to the incident voltage wave at a load, defined as Γ = (ZL - Zo)/(ZL + Zo).

Current Reflection Coefficient (Γ)

The ratio of the reflected current wave to the incident current wave at a load, which is related to the voltage reflection coefficient.

Voltage Standing Wave Ratio (VSWR)

A measure of the efficiency of power transmission in a transmission line, defined as S = (1 + |Γ|)/(1 - |Γ|).

Standing Wave Pattern

The distribution of voltage along a transmission line which occurs as a result of interference between incident and reflected waves.

Impedance Matching

The process of making the load impedance equivalent to the characteristic impedance to minimize reflection and maximize power transfer.

Standing Waves

Waves that remain in a constant position and result from the interference of two or more waves traveling in opposite directions.

Zg (Generator Impedance)

The impedance presented by the source of the signal in a transmission line system.

ZL (Load Impedance)

The impedance presented by the load that is connected to the end of a transmission line.