Emitter antennas for passive keyless entry systems

The car automatically unlocks when approached and lock when the owner walks away. The system works by having a series of LF (low frequency, 20kHz, 125kHz, 134kHz) transmitting antennas, both inside and outside the vehicle. External antennas are located in the door hadler, mirrors or trunk position. When vehicle is triggered either, close to vehicle, pulling the hadle or touching it an LF signal is transmitted from the antennas to the Key. Key is activated and transmited its ID back to the vehicle using RF channel, if Key code is correct the electronic module unlock the vehicle.

PREMO offers three kinds of emitter antennas to cover any market request. The KGEA-WT series: winding ferrite plus capacitor with heat shrink tube, intended to be protected by final customer assembly; the KGEA-BFC series: winding ferrite plus capacitor inside a plastic box (fully potted) with or without external connector; the KGEA-DH, IA and BA series winding ferrite plus capacitor overmoulded (built-in connector).

Several combinations of inductance and capacitor values are offered as standard versions. Any other combination can be provided, together with the possibility of fully customized design.