Custom Made Ultra-Miniature High Current Surface Mount Square Air Core Inductors 5.5 to 27nH For RF Circuits

Custom Made Ultra-Miniature High Current Surface Mount Square Air Core Inductors 5.5 to 27nH For RF Circuits

Description

Square Air Core RF Inductors, part of the wound air core inductor family, are ideal for RF circuits, broadband I/O filtering, frequency selection, or impedance matching. The unique square cross section of the air core inductor provides better performance, and offers manufacturing advantages over toroidal coils.

Model Example

1	2
Wire diameter:0.8mm ID 5mm;Turn:1.5 turn; Length:6mm	Wire Diameter:1.2mm ID 4mm;Turn:4 turn;Length:11mm

Typical Applications

RF Applications
RF Circuits
Broadband I/O Filtering
Impedance Matching

Features & Benefits

Square cross section construction
Available in 0806, 0807, and 0908 sizes
20 Inductance values ranging from 5.5nH to 27.3nH
High Q
High Current
Excellent SRF

Customized available

L versus Frequency Curve

What is an air core coil?

We'll use the term 'air core coil' to describe an inductor that does not depend upon a ferromagnetic material to achieve its specified inductance. 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.

Do you need an air coil?

What are the advantages of an air core coil?

Its inductance is unaffected by the current it carries. This contrasts with the situation with coils using ferromagnetic cores whose inductance tends to reach a peak at moderate field strengths before dropping towards zero as saturation approaches. Sometimes non-linearity in the magnetization curve can be tolerated; for example in switching converters. In circuits such as audio cross over networks in hi-fi speaker systems you must avoid distortion; then you need an air coil. Most radio transmitters rely on air coils to prevent the production of harmonics.

Air coils are also free of the 'iron losses' which affect ferromagnetic cores. As frequency is increased this advantage becomes progressively more important. You obtain better Q-factor, greater efficiency, greater power handling, and less distortion.

Lastly, air coils can be designed to perform at frequencies as high as 1 Ghz. Most ferromagnetic cores tend to be rather lossy above 100 MHz.

And the 'downside'?

Without a high permeability core you must have more and/or larger turns to achieve a given inductance value. More turns means larger coils, lower self-resonance and higher copper loss. At higher frequencies you generally don't need high inductance, so this is then less of a problem.
Greater stray field radiation and pickup. With the closed magnetic paths used in cored inductors radiation is much less serious. As the diameter increases towards a wavelength (lambda = c / f), loss due to electromagnetic radiation will become significant. Balanis has the gory details. You may be able to reduce this problem by enclosing the coil in a screen, or by mounting it at right angles to other coils it may be coupling with.

You may be using an air cored coil not because you require a circuit element with a specific inductance per se but because your coil is used as a proximity sensor, loop antenna, induction heater, Tesla coil, electromagnet, magnetometer head or deflection yoke etc. Then an external field may be what you want.

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