At a certain frequency it is in the resonance mode even in the absence of external capacitance and above this frequency the impedance of the coil is capacitive. This reduces the field because much of the magnetic field path is in air rather than the higher permeability core material and is a source of electromagnetic interference.

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Construction Of The Segmented Air Core Inductor Cross
An air core inductor is an inductor that does not depend upon a ferromagnetic material to achieve its specified inductance.

Air core inductor resonance. Some inductors are wound without a bobbin and just air as the core. This covers the cases where there really is just air inside as well as windings upon a different insulator such as bakelite glass or ptfe etc. The self resonance frequency in the early days of the age of radio it was discovered that the helix inductor is not an ideal inductor.
Self resonant freq 0624886. In an inductor wound on a straight rod shaped core the magnetic field lines emerging from one end of the core must pass through the air to re enter the core at the other end. Top of page.
The following is a design tool which calculates the inductance of an air core inductor. Q 208218 at 100. Air core inductor analysissynthesis calculator.
Well use the term air core coil to describe an inductor that does not depend upon a ferromagnetic material to achieve its specified inductance. What is an air core coil. Air core inductor coil inductance calculator.

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