Summary of Key Terms

Normalised impedance - AC characteristic of a circuit that may vary with the operating frequency.
Smith chart - polar co-ordinate diagram to solve transmission line problems.
Neper - logarithm ratio of two amplitudes of electronic signals.
Voltage Standing Wave Ratio VSR - the ratio between transmitted and reflected voltage on a transmission line.
Waveguide - a simple hollow metal tube without a center conductor.
Maser - a microwave amplifier.
Spectrum analyzer - a receiver that displays a plot of power versus frequency.
Tangential sensitivity - the minimum signal level detected above the background noise.
Rieke diagram - a polar co-ordinate diagram to show load conditions for RF oscillators.
Insertion loss - the drop in power as a signal enters a RF component.
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