Passive-Entry Antennas (Rod-Core Coils)
Passive-entry systems require a strong signal transmission. LF antennas (low frequency) with ferrite cores for data transmission under 130 kHz, are very important when in the immediate vicinity of the vehicle (1.5 - 2m). They require a customer-specific adaptation to the individual control units. To achieve maximum signal coverage, resonance frequency, inductivity, field strength and quality factor must all be taken into account when configuring the parameters.
SUMIDA AG has been able to achieve a remarkable increase in electronic performance and the reliability of the antennas, through, among other things, improving inductivity tolerance by +/-20 percent to less than +/-6 percent over the given operating temperature. The validation tests carried out confirmed maximum reliability, irrespective of whether the placement is an interior or exterior one. Extra functions such as tactile switches or capacitive sensors with evaluation electronics can also be integrated without any problems.
SUMIDA AG also offers comprehensive experience in the area of LF antenna high-volume production. The major portion of the required components and processes, including plastic injection molding, winding, soldering/welding and encapsulation, are manufactured and conducted in-house. Before the antennas leave the premises they run through a 100 percent electrical outgoing quality control.
Thanks to the comprehensive technical knowledge, SUMIDA AG is in an excellent starting position for tomorrow’s passive-entry and passive-go systems, which will be based on the advancements in LF antennas.