Ferrite coil WL0420

ferrite coremagneticinductive

Product Overview
WL0420 ferrite loop antenna coil is a compact magnetic component designed for reception and transmission in kHz–MHz applications. Construction features precision enameled copper winding on a ferrite (magnetic rod) core to increase magnetic flux concentration and improve signal sensitivity. Customization options include core material, number of turns, dimensions and frequency specification to fit specific electronic designs.

How It Works
The coil converts electromagnetic waves into electrical signals by magnetic induction. Key steps:

• External RF waves induce a changing magnetic field around the coil
• The ferrite core concentrates magnetic flux inside the winding
• The varying flux generates voltage in the enameled copper winding
• The electronic circuit then processes the induced signal

Applications

• AM radio receivers (compact directional loops)
• RFID and NFC near-field readers and tags
• IoT wireless modules and compact communication devices
• Industrial sensors and monitoring equipment
• Automotive electronics (key systems, TPMS, vehicle communication)
• Consumer and portable electronics

Advantages / Disadvantages
Advantages: high magnetic sensitivity, compact footprint, low power draw, good interference rejection, stable frequency behavior and cost-effective for mass production.
Disadvantages: directional sensitivity (orientation affects performance), mechanical fragility of ferrite, temperature sensitivity and shorter range vs. larger antennas. Appropriate material selection, circuit matching and mechanical protection reduce these limitations.

Datasheet (key manufacturing / mechanical items)
Core: ferrite (magnetic rod)
Winding: enameled copper, single-layer round or sectional
Typical wire diameter: 0.2 mm (other AWG options available)
Footprint length: 20 mm (typical)
Encapsulation: optional varnish, epoxy or coating
Mounting: through-hole or custom

Electrical Specifications (Typical)
Inductance range: 0.1 µH – 50 µH (customizable)
Inductance tolerance: ±2%, ±5%, ±10%
DC resistance (DCR): per design
Q factor: optimized for target frequency range
Self-resonant frequency: application-dependent
Operating frequency: kHz to MHz range
Rated current: per design
Insulation resistance: ≥50 MΩ

Troubleshooting / Reliability Notes
Common issues and mitigations: orientation-related poor reception (adjust antenna orientation, verify resonance), frequency drift (check thermal management and tolerances), reduced sensitivity (optimize turns and core size, improve shielding), excessive interference (PCB layout, grounding and shielding improvements). Protect ferrite cores from mechanical shock and use proper assembly procedures.

Technical specifications

• Model: WL0420
• Core material: ferrite (magnetic rod)
• Winding: enameled copper, single-layer round or sectional
• Wire diameter (typical): 0.2 mm
• Footprint length: 20 mm (typical)
• Encapsulation options: varnish, epoxy, coating
• Mounting: through-hole or customized
• Inductance: 0.1 µH to 50 µH (customizable)
• Inductance tolerances: ±2%, ±5%, ±10%
• Operating frequency: kHz to MHz range
• Insulation resistance: ≥50 MΩ
• Rated current, DCR and final electrical parameters: customizable per design