Explanation
Overview Reflected power is RF energy that travels back toward the transmitter because the antenna system is not perfectly matched to the transmission line. Some reflected power exists in nearly every practical antenna installation, but excessive reflected power may reduce system efficiency and, in some cases, cause transmitters to reduce output power or activate protective circuits. Common Causes Poor antenna tuning. Incorrect antenna length. Damaged coaxial cable. Faulty RF connectors. Water intrusion into the feed line. Incorrect impedance matching. How It Is Measured SWR meters. Directional wattmeters. Antenna analyzers. Vector Network Analyzers (VNAs). Reducing Reflected Power Adjust the antenna to resonance. Inspect feed-line connections. Repair or replace damaged coax. Verify proper antenna installation. Use an appropriate matching network when required. Applied to Chameleon Products Proper installation and tuning of Chameleon antenna systems help minimize reflected power and maximize the efficient transfer of RF energy from the transmitter to the antenna. Related Articles What Is Forward Power? What Is Standing Wave Ratio (SWR)? What Is Return Loss? What Is an Antenna Analy
The exact result depends on the complete station: frequency, geometry, feed line, matching network, return-current path, environment, operating power, and the reference plane of any measurement. A low SWR establishes an impedance relationship at that point; it does not by itself prove efficiency, radiation pattern, compatibility, or safety.
What to Verify
- Use the newest official product guide or primary service documentation.
- Confirm the exact model, revision, components, configuration, and operating conditions.
- Begin tests at low power and change one variable at a time.
- Do not infer compatibility from connector or thread fit.
Learn Next
- Antenna Selection: A Mission-First Decision Guide
- Engineering Design Tradeoffs in Portable HF Antennas
- Antenna Measurement Reference Planes
- Understanding Common-Mode Current
Source note: Independently synthesized with reference to The ARRL Handbook for Radio Communications, 99th edition (2022), and The ARRL Antenna Book for Radio Communications, 24th edition (2019). Verify changing regulations, services, software, specifications, availability, and safety requirements against current primary sources.
