Search results.

Impedance is complex opposition to alternating current: it includes resistance and a frequency-dependent reactance. Antenna input impedance is therefore more than a DC resistance reading.

Impedance is written Z = R + jX.

Line impedance and length between two resistive impedances.

Coaxial cable carries a signal using an inner conductor and a concentric outer conductor. The dielectric and construction determine characteristic impedance, losses and propagation speed.

Resonant frequency and characteristic impedance of an ideal LC circuit.

SWR is the ratio of maximum to minimum voltage on a line with standing waves. It is related to reflection caused by an impedance mismatch.

Impedance

Impedance

A line’s characteristic impedance describes voltage divided by current for a travelling wave.

The familiar 20-log voltage conversion represents a power ratio only when impedances are equal.

Complex impedances or non-sinusoidal signals require additional treatment.

Impedance