Air inductor SMD

air coreradio-frequencySMT

Overview
SMD air-core coil is a surface-mount inductor constructed from fine enameled copper wire wound without a magnetic core. It provides stable high-frequency performance, high Q-factor and no magnetic saturation, making it suitable for RF circuits, wireless modules, antennas and compact IoT devices.

Main features

• High-frequency performance with no core losses or magnetic saturation.
• Stable inductance and high Q factor for low signal distortion.
• Low DC resistance (customizable) optimized for RF ranges.
• Compact, lightweight SMT construction compatible with automated assembly.
• Available in multiple inductance values, wire diameters and custom dimensions; OEM/ODM options supported.
• Good thermal stability and linearity for precision RF applications.

Product Datasheet (summary)
Item : Description
SMD Air Core Coil : Enameled copper wire
Wire Diameter : 0.1 mm (AWG options available)
Winding Type : Single-layer round or sectional winding
Core Material : Air (non-magnetic)
Footprint length : 10–15 mm (typical)
Encapsulation : Optional varnish, epoxy or coating
Mounting : SMT compatible; through-hole / custom options available

Electrical Specifications (Typical)
Parameter : Description
Inductance Range : 0.1 µH – 100 µH (customizable)
Inductance Tolerance : ±2%, ±5%, ±10%
DC Resistance (DCR) : Configurable per design
Q Factor : High, optimized for target frequency
Self-Resonant Frequency : High, application-dependent
Operating Frequency : kHz to MHz range
Rated Current : Defined per design
Insulation Resistance : ≥100 MΩ

How it works
The coil operates by electromagnetic induction: current through the copper windings generates a magnetic field in air. The resulting inductance is used for filtering, impedance matching, energy storage and RF signal conditioning. Absence of a magnetic core eliminates hysteresis and eddy-current losses and avoids core saturation, improving linearity and high-frequency stability.

Applications

• RF communication devices: antennas, RF amplifiers, RF modules and wireless transmitters.
• Wireless charging systems and energy transfer pads.
• IoT modules, Bluetooth/Wi‑Fi/GPS units and wearable electronics.
• High-frequency filters, impedance matching networks and precision sensors.
• Medical electronics, automotive and aerospace RF subsystems (with appropriate qualification).

Advantages & Limitations

• Advantages: zero core losses, high Q, good linearity, stable inductance, SMT compatibility and low high-frequency distortion.
• Limitations: lower inductance per volume versus ferrite-core inductors (more turns/size required for higher L); reduced magnetic field concentration and energy storage for power applications; increased sensitivity to nearby conductors/coils (mutual inductance/EMI).

Troubleshooting & Manufacturing Notes
Common issues include unstable inductance (incorrect turns or winding deformation), overheating (excess current or insufficient thermal design), RF interference from nearby components (optimize spacing/layout), mechanical damage (use correct packaging and pick-and-place settings) and poor solder joints (ensure proper reflow profile and PCB cleaning). Specify correct wire diameter and PCB thermal layout for reliable operation.

Specifications / Technical data

• Brand : WEILONG TECHNOLOGY
• Type : SMD air-core coil (surface-mount inductor, air core)
• Inductance : 0.1 µH – 100 µH (customizable)
• Tolerances : ±2%, ±5%, ±10%
• Wire : Enameled copper wire, typical diameter 0.1 mm (AWG options available)
• Winding : Single-layer round or sectional winding
• Core material : Air (non-magnetic)
• Footprint : 10–15 mm (typical footprint length)
• Mounting : SMT compatible; through-hole / custom options available
• Encapsulation : Optional varnish, epoxy or coating
• Frequency range : kHz to MHz (optimized for RF/high frequency)
• Q-factor : High (optimized per frequency)
• DCR : Configurable
• Insulation Resistance : ≥100 MΩ
• Rated current : Defined per design
• Applications : RF modules, wireless charging, IoT, medical electronics, antennas, aerospace/automotive RF subsystems (with qualification)