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Reflected Power Formula:
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Reflected Power (RP) is the percentage of power that is reflected back from a load due to impedance mismatch, calculated from the Voltage Standing Wave Ratio (VSWR). It indicates how well an antenna or load is matched to the transmission line.
The calculator uses the reflected power formula:
Where:
Explanation: The formula calculates the percentage of incident power that is reflected back due to impedance mismatch, with VSWR values ranging from 1 (perfect match) to infinity (complete mismatch).
Details: Calculating reflected power is crucial for RF system design, antenna tuning, and ensuring efficient power transfer. High reflected power can damage transmitters and reduce system performance.
Tips: Enter VSWR as a ratio (must be ≥1). A VSWR of 1 indicates perfect match (0% reflected power), while higher values indicate increasing mismatch and reflected power.
Q1: What is a good VSWR value?
A: A VSWR of 1.5:1 or lower is generally considered good, representing less than 4% reflected power. A VSWR of 2:1 represents about 11% reflected power.
Q2: How does reflected power affect transmitter performance?
A: High reflected power can cause transmitter overheating, reduced output power, and potential damage to amplifier components.
Q3: What causes high VSWR?
A: Impedance mismatch between transmission line and load, cable damage, connector issues, or antenna problems can cause high VSWR.
Q4: Can reflected power be completely eliminated?
A: Perfect matching (VSWR = 1:1) is theoretically possible but practically difficult to achieve across all frequencies. Matching networks help minimize reflected power.
Q5: How is VSWR measured?
A: VSWR can be measured using a VSWR meter, network analyzer, or by measuring forward and reflected power with a power meter and directional coupler.