FILAMAG-F: the solution to reduce cavity resonances in RF enclosures

Reading time: 4 min

In modern RF and microwave systems, operating frequencies are constantly increasing. At these high frequencies, even compact metal enclosures can create unwanted electromagnetic resonance. These phenomena can disrupt the operation of electronic circuits and degrade electromagnetic compatibility (EMC).

In this context, HYMAG'IN is presenting a new scientific publication at the 2026 International EMC Symposium on the exploration of an innovative solution: the use of a flexible, 3D-printable magnetic filament, FILAMAG-F, to attenuate these resonances inside RF enclosures.

The study is based on a rectangular metal cavity used as an experimental model of an RF enclosure. Two monopole probes are used to measure the transmission of the electromagnetic signal inside the cavity over a wide frequency band between 2 and 7 GHz.

FILAMAG-F plates of varying thicknesses (from 0.4 mm to 1.6 mm) are then integrated into the cavity to assess their ability to absorb electromagnetic waves and reduce resonances.

Experimental measurements show a clear attenuation of resonance peaks when the absorbing material is present. The thicker the material, the greater the damping effect.

According to the results obtained:

• The average reduction in transmission peaks varies from approximately 11 dB to 28 dB depending on the thickness of the material;
• Absorption effectively reduces the resonant modes inside the cavity.

To better understand these results, HYMAG'IN performed electromagnetic simulations. They confirm the experimental observations and provide insights into the physical mechanisms responsible for absorption.

One of the main advantages of FILAMAG-F filament is its compatibility with 3D printing. This makes it easy to produce customized absorber parts tailored to the internal geometry of electronic equipment.

This approach paves the way for EMC solutions that are:

• Easy to integrate into compact enclosures,
• Customizable,
• And faster to prototype than traditional absorbing materials.

These results show that printable magnetic filaments may be a promising solution for improving electromagnetic compatibility and limiting resonances in high-frequency RF systems.

HYMAG'IN offers tailor-made solutions by modifying the load, matrix, or even the 3D design to provide you with an absorber that meets all your specifications.

To learn more about the methodology, simulations, and detailed results, read the full scientific article.