LFAD-BF/BFC Diabolo Shape Transmitter Antenna for Automotive (0.500mH)

Freq. (kHz)L (µH)Length (mm)Width (mm)Height (mm)SRF (MHz) MinQ MinCres (nF)
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Diabolo Shape Transmitter Antenna for Automotive.

Most of the vehicles currently manufactured in the world with a KES (keyless entry system) use a number of short antennas. Depending on the quality of the vehicle and the system they use 3, 4, 5 antennas (in the door handles, interior antenna, in the trunk handle…

Rooming an antenna in the car sometime becomes a very hard task.

This kind of antennas keep the performance saving space, little bit wider, but very reduced length in the total space.

Depending on the requirements and location of the antennas in the vehicle and taking into account its exposure to environmental conditions, grade IP waterproof, mechanical robustness, etc.. PREMO offers from LPM technology, to Polyurethane, mixed LPM-resin and HPM.


New Diabolo with Low Pressure Technology (LPM)

  • LPM is a well know technology in PREMO
  • Vert fast to produce (No Curing needed)
  • IP56 grade Waterproof

New Diabolo with PU-resin

  • High mechanical robustness
  • IP68 grade Waterproof



The main technical and economic advantages:

  • Middle antenna (length until 70mm).
  • External housing shape flat Material PBT-GF30% or PA66-GF30%
  • High stability in temperature (-40ºC up to +85ºC).
  • Resonant frequency adjusting below +/- 2kHz.
  • Custom L-C value (F-Res: LFAD-BF) under demand
  • This antenna is designed based on AECQ-200.
  • Less length than classic ferrite rod antenna.

Antenna is measured in resonant mode.

The specification chart is a reference guide for the most common required values at working frequencies of 125 kHz, 20 kHz and 134.2 kHz. Any other inductancevalue at LF or tighter tolerances can be provided. Please contact our sales department for any inquiry.

Operating Frequency @125Khz @25ºC @1Vac  (L+C in series)


L (mH)Cres (nF)Q(L+C)Rac (Ω)ArmsH-Field (dBµV/m) @1App@1mFreq. (kHz)Height (mm)Length (mm)Width (mm)
LFAD-BF-B-0500J   0.500 3.3


<2 1A 108.3 125 16.5 67 45.66


LFAD-BF dimensions


Nomenclature description and Schematic Diagram

L+C in series:

LFAD-BF electrical diagram


H-field measurement LF Antenna LFAD-BF/BFC


set up LFAD-BF


Measuring conditions example

The sample (antenna under test), the current flowing through it and the EM-field at 3m measured with a loop antenna (60cm) are obtained at 125Khz frequency.

> Note: Ipp is the current peak to peak measured with the oscilloscope