We are independent & ad-supported. We may earn a commission for purchases made through our links.

Advertiser Disclosure

Our website is an independent, advertising-supported platform. We provide our content free of charge to our readers, and to keep it that way, we rely on revenue generated through advertisements and affiliate partnerships. This means that when you click on certain links on our site and make a purchase, we may earn a commission. Learn more.

How We Make Money

We sustain our operations through affiliate commissions and advertising. If you click on an affiliate link and make a purchase, we may receive a commission from the merchant at no additional cost to you. We also display advertisements on our website, which help generate revenue to support our work and keep our content free for readers. Our editorial team operates independently from our advertising and affiliate partnerships to ensure that our content remains unbiased and focused on providing you with the best information and recommendations based on thorough research and honest evaluations. To remain transparent, we’ve provided a list of our current affiliate partners here.

What is an Air Core Inductor?

By Michael Smathers
Updated May 16, 2024
Our promise to you
EasyTechJunkie is dedicated to creating trustworthy, high-quality content that always prioritizes transparency, integrity, and inclusivity above all else. Our ensure that our content creation and review process includes rigorous fact-checking, evidence-based, and continual updates to ensure accuracy and reliability.

Our Promise to you

Founded in 2002, our company has been a trusted resource for readers seeking informative and engaging content. Our dedication to quality remains unwavering—and will never change. We follow a strict editorial policy, ensuring that our content is authored by highly qualified professionals and edited by subject matter experts. This guarantees that everything we publish is objective, accurate, and trustworthy.

Over the years, we've refined our approach to cover a wide range of topics, providing readers with reliable and practical advice to enhance their knowledge and skills. That's why millions of readers turn to us each year. Join us in celebrating the joy of learning, guided by standards you can trust.

Editorial Standards

At EasyTechJunkie, we are committed to creating content that you can trust. Our editorial process is designed to ensure that every piece of content we publish is accurate, reliable, and informative.

Our team of experienced writers and editors follows a strict set of guidelines to ensure the highest quality content. We conduct thorough research, fact-check all information, and rely on credible sources to back up our claims. Our content is reviewed by subject matter experts to ensure accuracy and clarity.

We believe in transparency and maintain editorial independence from our advertisers. Our team does not receive direct compensation from advertisers, allowing us to create unbiased content that prioritizes your interests.

In alternating electrical circuits, the voltage changes polarity up to 60 times per second with each terminal changing from positive to negative and back again. Normally, such rapid changes in voltage would produce power fluctuations. An inductor is a component that produces an electromagnetic field in response to electrical current flowing through a coiled wire. The strength of an inductor depends on the current being applied, the core of the inductor, and the number of turns in the wire coil forming the inductor. An air core inductor is a wire coil with no solid core inside the coil.

Air has a low electrical conductivity, and so produces the weakest of all magnetic fields in opposition to current flow. The formula for inductance of a single layer air core inductor can be expressed as d2n2/18d+40z. D represents the diameter of the coil, n represents the number of turns in the coil, and z represents the length of the inductor. All units are expressed in inches. The inductance is measured in microhenries, or μH.

One of the biggest advantages of an air core inductor is the minimal signal loss that occurs at higher magnetic field strengths. With ferromagnetic cores such as iron, the core can become magnetically saturated when the magnetic field is too strong. This leads to a loss in inductance, but an air core inductor has no such problem. An air core inductor can carry electromagnetic frequencies up to 1 GHz, but ferromagnetic core inductors tend to experience loss when the frequency exceeds 100 MHz.

There are also disadvantages inherent to air core inductors: the main disadvantage is the number of turns in a coil necessary to achieve the same inductance that would occur in a solid-core inductor. The low electrical conductivity of air translates to low magnetic permeability and therefore lower inductance. They also pick up and transfer electromagnetic interference more easily because there are no closed magnetic pathways in air core inductors.

Radio transmitters make the most use of air core inductors to minimize the harmonic vibrations resulting from electromagnetic waves traveling across them. Hi-fi stereo speakers also include them to ensure minimal sound distortion occurs. Smaller air-core inductors are seen on printed circuit boards for electronic components because there are generally low voltages and low currents traveling along those pathways.

EasyTechJunkie is dedicated to providing accurate and trustworthy information. We carefully select reputable sources and employ a rigorous fact-checking process to maintain the highest standards. To learn more about our commitment to accuracy, read our editorial process.

Discussion Comments

EasyTechJunkie, in your inbox

Our latest articles, guides, and more, delivered daily.

EasyTechJunkie, in your inbox

Our latest articles, guides, and more, delivered daily.