LFAD-Series (Diabolo-Shape) antennas

PREMO launches the LFAD-Series (Diabolo-Shape) of magnetic emitter antennas 

This innovation is designed for access (passive keyless entry), and general RFID-LF access and RTLS applications.

PREMO, the leading manufacturer of inductive components, has announced the LFAD-Series (Diabolo-shape) antennas, providing up to 40-50% reduction in length, this is an innovative design to produce same H-field with a different L/D core relationship.

Most of the LF antennas in the market has a length 70-80mm for standard range, 150-170mm for mid-range and 250-350mm for long-range (Alma-CoreTM).

Since a couple of years the Mid-Range antennas with a sensitivity around 3 times of the Standard ones, becomes more and more popular to provide a wakeup distance around 4-5m.

The antenna performance in term of mechanical robustness, resonance frequency variation versus temperature and waterproof have been the most important headache for the designers.

Although everything has been solved in that length, we have designed and patented a new concept of emitter antennas that solves all those handicaps with greater reliability without compromising the cost. Therefore, the technical challenge is achieving all the advantage of Mid-range and Long-range antennas without the above-mentioned drawbacks of brittleness, costly materials, processes and investments and critical temperature and mechanical performance.

A short sentence Diabolo ™ Antennas stand for: All the good features of Mid-Range antennas while preserving and keeping all the good features of the short-range antennas (cost effective, mechanically robust and thermally stable). Premo innovation consist of using a Core with a Variable Cross-Sectional area that is maximum at both extremes of the antenna and minimum at the center of the antenna where the winding is located.

The antennas typically meet the AEC-Q200 (specific automotive quality standard) and waterproof specs from IP54 to IP69K standards due to their specific packaging (rugged plastic box filled with polyurethane resin, PA-LPM protection, combination of both materials and HPM (high pressure molding) in PBT GF20-30 for IP69K), also provide a much better drop, bending and torsion test limits.


Shape simulation shows the much higher induction ( red ) in the minimum section area:





A wide range of values in catalogue of LFAD-Series and under demand, from 160uH to 500uH, for 20kHz, 125kHz and 134.2kHz (with or without capacitor and resistors inside, under demand).

Samples available in our web page by end of Q4.

You will see (under invitation) most important and recent PREMO innovations in Electronica Munich, Hall B6/ Booth 318 and Hall B3 Booth 548



PREMO is a Spain-based company engaged in the development, manufacture, and sale of electronic components with special focus on the key enabling technologies of the 4th Industrial Revolution: IoT, M2M, VR, Connected and Electric Vehicles.

Our product portfolio includes RFID antennas (worldwide leader), AR/ VR Motion Tracking Sensors, power transformers, inductors & chokes, current sensors, EMC filters, and PLC components. In addition to our broad range of standard components, off-the-shelf products, PREMO also designs custom solutions to fit customer requirements, based on the latest technologies to help your systems be more efficient.

Over 1500 employees with 5 design centers and 3 production locations and an extensive sales network let PREMO have a global presence in more than 36 countries to meet our customers specific needs.

56 years being a preferred supplier because of our strong commitment to business excellence, engineering support, reliable delivery and the quality of our products.