VSWR is an abbreviation for voltage standing wave ratio, the ratio of the voltage maximum to the voltage minimum on a transmission line, caused when an incident wave is reflected due to a discontinuity or improper match to the line.
VSWR stands for voltage standing wave ratio, a measure of how well a transmission line is matched, expressed as the ratio of the maximum voltage to the minimum voltage along the line. When part of a signal is reflected back, due to a discontinuity in the line or an improper impedance match, the forward and reflected waves combine to form standing waves with voltage maxima and minima, and VSWR is the ratio between them. It is the voltage form of the standing wave ratio.
In a perfectly matched line, no signal is reflected, the maxima and minima are equal, and the VSWR is one to one, the ideal. As more signal is reflected from a mismatch, the ratio rises, indicating a poorer match and reduced efficiency. A low VSWR is therefore desirable for efficient signal transfer in high-frequency systems.
In commercial and industrial high-frequency systems, VSWR indicates how well a cable, antenna, and equipment are matched. Recognizing the measure helps in understanding the importance of consistent impedance and good matching.
Because a low VSWR is desirable for efficient signal transfer in high-frequency systems, the measure indicates how well a cable, antenna, and equipment are matched, with cable engineered for stable impedance helping minimize reflections and preserve efficient signal transfer.
At Windy City Wire, the focus on coaxial and signal cable with consistent impedance supports a low VSWR in high-frequency systems. Supplying cable engineered for stable impedance helps minimize reflections and preserve efficient signal transfer across commercial communication systems.
VSWR (voltage standing wave ratio)