VSWR Calculator - Return Loss & Reflection Coefficient | RFCalcLab
Analyze impedance mismatch and antenna performance. Convert between VSWR, Return Loss, and Reflection Coefficient. Calculate reflected power, mismatch loss, and standing wave ratios for radio systems.
How to Use the VSWR Converter
Enter one known parameter: VSWR, Return Loss, or Reflection Coefficient (Gamma). The tool will automatically calculate the other two values and related mismatch parameters.
VSWR (Voltage Standing Wave Ratio) should be 1.0 or higher. A VSWR of 1.5:1 is generally acceptable for most radio systems, while values above 2.0:1 may trigger power foldback in transmitters.
Return loss is provided in positive dB. A higher return loss (e.g., 20 dB) indicates a better impedance match than a lower value (e.g., 10 dB).
Related Topics
- VSWR calculator
- return loss
- reflection coefficient
- mismatch loss
- impedance matching
- antenna SWR
Frequently Asked Questions
- What is a good VSWR for an antenna?
- A VSWR of 1.0:1 is a perfect match. In practice, 1.5:1 is considered excellent for most applications, and up to 2.0:1 is acceptable for many mobile and amateur radio systems.
- What happens if my VSWR is too high?
- A high VSWR (e.g., above 3.0:1) means a large portion of your power is reflected back to the transmitter. This can cause the transmitter to overheat or reduce its power output to protect itself.
- Is return loss the same as VSWR?
- They represent the same physical phenomenon (impedance mismatch) but in different units. VSWR is a ratio of standing waves, while return loss is the ratio of reflected power to incident power in decibels (dB).