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Chameleon Knowledge Base · The Complete Online HF Antenna Handbook

What Is the Far Field?

Learn what the far field is and why it represents the true radiation pattern of an antenna.

Getting Started HF Fundamentals Reviewed 2026-07-14
Short Answer: Learn what the far field is and why it represents the true radiation pattern of an antenna.

Explanation

Overview The far field , also known as the Fraunhofer region , is the region sufficiently distant from an antenna where electromagnetic waves have become fully established. Within the far field, the antenna's radiation pattern becomes stable and independent of distance. Characteristics Stable radiation pattern. Electric and magnetic fields remain proportional. Power density decreases with the square of distance. Engineering Applications Antenna gain measurements. Radiation pattern measurements. Antenna range testing. Field strength measurements. Why It Matters Nearly all published antenna gain specifications are measured in the far field. This region best represents how an antenna performs during real-world communication. Applied to Chameleon Products Performance data published for Chameleon antennas are based on engineering measurements that represent far-field operation whenever appropriate. Related Articles What Is the Near Field? What Is Antenna Gain? What Is a Radiation Pattern? What Are Fresnel Zones? Related Products All Chameleon Antennas

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.