RFID Absorber Material

​RFID and NFC antennas frequently under-perform – or fail entirely – when mounted on or near metal surfaces.

The metal de-tunes the antenna, shifts its resonant frequency away from 13.56 MHz and absorbs energy that should be coupling to the tag or reader.

The WE-FAS RFID Absorber Material range from Würth Elektronik is engineered to solve exactly this problem.

Placed between the antenna coil and the metal substrate, the high-permeability flexible sheet redirects the magnetic flux, restores read range and stabilises performance.

As an authorised converter, we supply this material from full sheets down to bespoke, ready-to-apply parts – die-cut, kiss-cut, slit or knife-cut to your drawing, with the factory-fitted self-adhesive backing already in place.

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The material family

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The WE-FAS RFID range is a family of thin, flexible magnetic absorber sheets optimised for the 13.56 MHz HF RFID and NFC band.

Every variant is supplied with a 0.03 mm double-sided adhesive tape and release liner already applied, so finished parts can be peeled and stuck directly to the host PCB, antenna module or enclosure.

All grades are non-inflammable / self-extinguishing and are RoHS and REACh compliant.

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The family splits into two complementary grades:

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• WE-FAS 314xx series – a flexible rubber composite filled with ferrite powder, with a typical relative permeability µ' of 25 at 13.56 MHz and an extended operating window up to +90 °C.  Ideal where elevated temperatures are expected or where a moderate absorber is sufficient.

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• WE-FAS 334xx series – a special flame-retardant rubber loaded with metal powder, giving a higher typical µ' of 55 at 13.56 MHz for maximum decoupling from metal in compact designs. Rated up to +60 °C.

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Each grade is offered in three nominal thicknesses – 0.10, 0.20 and 0.30 mm – allowing designers to trade absorber performance against available headroom.