Space saving magnetic emitter antennas for keyless entry systems

October 09, 2018 // By Christoph Hammerschmidt
With the LFAD-series LF antennas, designers of passive keyless entry systems, and, more general, of RFID-LF access and RTLS applications, can significantly reduce the dimensions of their designs. According to manufacturer Premo (Malaga, Spain), these antennas are 40 to 50% smaller than comparable products.

The LFAD-series LF antennas produce the same H-field as longer designs, with a different L/D core relation.

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

The antenna performance in terms 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, Premo has 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.

The antennas typically meet the AEC-Q200 automotive quality standard and waterproof specs from IP54 to IP69K standards due to their specific packaging.  

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

Premo will exhibit its products at Electronica Munich, Hall B6 Booth 318 / Hall B3 Booth 548

More information: www.grupopremo.com


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