Custom RF & Electromagnetic Solutions

HYMAG'IN's off-the-shelf products cover a wide range of electromagnetic applications. But some challenges require more: a specific frequency target, an unusual geometry, a thermal or mechanical constraint that no standard material can meet. For these cases, our RF experts and material scientists work directly with you to design, develop and validate a custom solution from the first technical discussion to the final validated prototype.

Whether your need is a new ferrite powder formulation, a tailor-made composite filament, a castable resin for RF loads, or a full system-level study combining simulation, material development and prototyping, we have the expertise and the tools to deliver.

Ferrite powders

When your application requires specific electromagnetic properties that standard NANOMAG grades cannot provide, we synthesize custom ferrite powders from scratch. Combining our expertise in materials science and electromagnetism, we formulate and characterize powders tailored to your exact frequency targets and loss requirements, from 0.5 to 100 GHz.

We work with multiple ferrite families depending on your application:

• Spinel ferrites (MnZn, NiZn, NiZnCo) - optimized for RF absorption from 0.5 to 100 GHz, or for antenna miniaturization through magneto-dielectric formulations where permeability and permittivity are balanced (ε/µ ~ 1).
• Hexaferrites - engineered for high-frequency applications above 10 GHz, with magnetic anisotropy and ferromagnetic resonance tailored for radar absorbing materials, antenna miniaturization and sensors.
• Superparamagnetic materials - ultra-fine particles below 10 nm, for applications in sensors, medical imaging and biomedical treatments requiring near-zero coercivity.

Every custom powder is characterized by electron microscopy (SEM-EDS), X-ray diffraction (XRD) and RF measurement before delivery. Produced in France, from a unique one-step hydrothermal synthesis process.

Technical thermoplastics - Custom composite filaments and pellets

Your system has RF, mechanical and thermal requirements that no single standard material addresses simultaneously. We design customized composites by combining our ferrite powders with the polymer matrix that best fits your constraints, integrating your full specification sheet from the start.

We work with a wide range of thermoplastic matrices, each bringing specific mechanical and thermal properties:

• PLA - lightweight, easy to print, ideal for prototyping and low-temperature environments
• PA6 (Nylon-6) - rigidity, heat resistance up to 111°C for molded or annealed parts, structural strength
• PEEK - extreme temperature resistance, chemical stability, for aerospace-grade applications
• PEI / ULTEM - aerospace qualified, high heat resistance, low outgassing, proven in demanding environments

The resulting composite is available as 3D-printable filament or injection-ready pellets, depending on your manufacturing process. We fine-tune the ferrite loading rate, particle size and dispersion to simultaneously meet your RF targets (absorption band, reflection loss level) and your mechanical or thermal constraints.

A concrete example: a PEI plate loaded with magnetite, 2.2 mm thick, delivering high return loss in the X-band, designed by simulation, validated by measurement, qualified for high-temperature aerospace environments.

Castable resins

If your application requires filling complex molds, coating irregular surfaces or producing RF loads and absorbing filters in resin-based formats, we develop custom castable resin formulations. For customers already using resins who want to optimize their RF performance, we reformulate, characterize and validate every parameter of the compound, ensuring reliable, reproducible results across your production runs.

We control and characterize every relevant property of each formulation:

• Matrix selection - tailor-made epoxy, silicone or other resin systems, chosen for compatibility with RF fillers and for the required viscosity
• RF filler loading - ferrite powders and other RF additives, optimized for your target frequency band and loss level
• Viscosity - adapted for molding, casting and filling complex geometries
• Density - controlled for electromagnetic performance and weight targets
• Curing time - optimized for your production rhythm, from prototyping to industrial volumes
• Dimensional stability - ensuring homogeneity and reproducibility of every molded part

Custom resins can be used to manufacture RF loads, electromagnetic absorbing filters, infrared absorbers and other RF components for electronic systems. All formulations are developed and produced in France.

Every custom project starts with a conversation. We work with you to understand your system constraints, define success criteria and build a realistic development roadmap, with clear go/no-go milestones at each stage.

01 - Analysis of requirements

We start by mapping your existing solution, your RF requirements, your mechanical and thermal constraints, and the regulatory or qualification context. We review the state of the art, monitor freedom of use, and identify the most promising technical direction.

02 - Development and RF simulations

Our RF engineers run electromagnetic simulations to predict material and geometry performance in your specific system — before a single gram of material is produced. We test feasibility, characterize candidate formulations, and iterate on designs virtually to save time and cost.

03 - Prototyping and validation

We manufacture prototypes using 3D printing, injection molding or casting — depending on your target production process. We measure RF performance on our in-house characterization equipment and validate against your specification. We optimize geometry, loading rate and stacking until every line of your spec sheet is met.

04 - Production and industrialization

Once the solution is validated, we support the transition to production: technical and economic study, technology transfer to your manufacturing line, or in-house production at HYMAG'IN. We propose monthly progress reviews throughout the project to ensure seamless integration into your system.

Timeline: from a few days for a rapid simulation study, to one year for a full custom material development with qualification. We adapt to your roadmap.

3 weeks - Aerospace research center

Need: End-to-end resolution of a system-level EMC problem.

How: RF modeling of the use case, optimized material selection, absorber geometry and placement through simulation.

Result: 3D-printed absorber part ready for integration into the existing system.

3 months - Aerospace center

Need: High-temperature absorbing material within tight space constraints.

How: Identification of the right polymer matrix and ferrite powder through iterative formulation and testing.

Result: RF-absorbing PEI/ULTEM pellets qualified for high-temperature aerospace use.

6 months - Automotive supplier

Need: Ultra-high-frequency dielectric solution for automotive radar.

How: Feasibility study, material characterization and prototyping across target frequency bands.

Result: Dielectric filament ready for integration into the customer's manufacturing process.

1 year - Ferrite industry manufacturer

Need: Ferrite powder with specific electromagnetic performance targets.

How: Literature review to define specifications (attenuation dB/cm, ε, µ, reflection loss), followed by synthesis and full characterization.

Result: New stoichiometric ferrite formulation delivered with complete technical documentation.

• RF expertise from day one - our engineers translate your system-level RF problem into material and geometry specifications, so you don't need to bridge that gap yourself
• Full in-house capability - material synthesis, composite formulation, RF simulation, 3D printing, RF characterization: every step under one roof, in France
• Validated, not just formulated - every custom solution is measured against your specs before delivery, not just modeled
• Format flexibility - filaments, pellets, resins, powders, and soon inks and coatings: we adapt to your manufacturing process, not the other way around
• Scalable roadmap - from a 3-week feasibility study to a multi-year industrialization program, with clear milestones and monthly progress reviews
• European sovereignty - 100% French production, independent from Asian supply chains, supporting procurement requirements in defense and aerospace

Ready to discuss your challenge?

Your RF problem may not have a standard solution. Let's build yours.