How to Measure Return Loss at BitWise Laboratories

 At BitWise Laboratories, we often get asked how to measure return loss and why it matters in RF and microwave systems. Return loss is the ratio of reflected signal power to incident signal power, expressed in decibels (dB). A higher return loss means less power is being reflected, which indicates a better impedance match and improved signal quality.

To measure return loss, engineers typically use a vector network analyzer (VNA) or a spectrum analyzer with a tracking generator. Connect the device under test, calibrate the analyzer, and measure the reflected power against the transmitted power. The resulting value in dB tells you how well the system is matched.

Accurately knowing how to measure return loss helps ensure efficient performance in cables, antennas, and other RF components.