SMD 3D RFID Transponder Antenna Coil for Automotive Passive Keyless Entry Systems

The SMD 3D RFID transponder antenna coil features a compact size of 13.0×13.0×3.1mm. It uses three independent coils combined along the X-axis, Y-axis, and Z-axis to achieve full spatial coverage, ensuring consistent signal reception from any direction. The ferrite multilayer structure provides excellent electrical performance. The low-profile design saves PCB space. The three-coil single-component integrated solution reduces assembly costs and improves circuit reliability. It is widely used in automotive passive keyless entry systems, keyless start systems, TPMS wake-up functions, industrial logistics control, access control, and tracking devices.

• Dimensions – 13.0×13.0×3.1mm
• Three-axis coverage – X-axis / Y-axis / Z-axis / XY-axis
• High Q factor
• Ferrite multilayer structure
• Low-profile design
• Wide operating temperature range
• SMD package
• Three-coil single-component integration

• Automotive
• Passive keyless entry and Keyless Go Systems
• RTPMS with wake up functions
• Industrial logistics and control
• Access control
• Tracking devices

• Test Freq. : 125KHz / 1V.
• Operating Temp. : －40℃ ~ ＋85℃
• Sensitivity (S0) measured with Helmholtz Coils H=8.36 A/m@125kHz.
• SRF: Self Resonant Frequency of the coil.
• Wx/Wy/Wz means winding coil of X, Y and Z axis.
• f20/f125/f134.2 means resonant frequency of 20kHz, 125kHz and 134.2kHz.
• Test under the condition of relative humidity of 85%
• Any other inductance value at LF or tighter tolerances can be provided. Also can be supplied different inductance value in the different winding axis. Please contact our salesperson for any inquiries.

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Q: What is the difference between a 3D coil and a standard single-axis coil?

A: A 3D coil integrates three independent coils along the X, Y, and Z axes into a single component, achieving full spatial coverage. Regardless of the direction from which the transponder approaches the antenna, it can be reliably detected. This is especially suitable for applications with uncertain orientation, such as automotive passive keyless entry systems.

Q: What are the advantages of three-coil single-component integration?

A: Compared to using three separate single-axis coils, the three-coil single-component integration reduces component count, saves PCB space, simplifies the placement process, improves production efficiency, and enhances overall circuit reliability.

Q: What are the advantages of the ferrite multilayer structure?

A: The ferrite multilayer structure provides high magnetic permeability and excellent electrical performance within a compact size. It ensures the coil maintains high Q factor and stable inductance at the operating frequency, with good stability across a wide temperature range.