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Chameleon Knowledge Base · The Complete Online HF Antenna Handbook

What Is an Air-Core Inductor?

Learn what an air-core inductor is, how it differs from ferrite-core inductors, and why it is commonly used in high-power RF circuits.

Getting Started HF Fundamentals Reviewed 2026-07-14
Short Answer: Learn what an air-core inductor is, how it differs from ferrite-core inductors, and why it is commonly used in high-power RF circuits.

Explanation

Overview An air-core inductor is an inductor wound without a magnetic core. The space inside the coil contains only air or a non-magnetic support structure. Air-core inductors eliminate the possibility of magnetic core saturation, making them well suited for many high-power RF applications. Advantages No magnetic saturation. Excellent linearity. Low RF losses. Excellent high-power capability. Limitations Larger physical size. Lower inductance per turn. Greater mechanical sensitivity. Applications Loading coils. Magnetic loops. RF amplifiers. High-power matching networks. Applied to Chameleon Products Air-core inductors are used where high RF current, low loss, and excellent linearity are required, particularly in loading coils and high-power matching applications. Related Articles What Is an Inductor? What Is Ferrite Saturation? What Is a Loading Coil? What Is Q Factor? Related Products CHA MCC 2.0 CHA M-COIL CHA M25-COIL

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.