1. What is a Multilayer Air Core Inductor Calculator?

Definition: This calculator estimates the inductance of a multilayer air-core coil based on its physical dimensions and number of turns.

Purpose: It helps electronics engineers and hobbyists design air-core inductors for RF circuits, filters, and other applications.

2. How Does the Calculator Work?

The calculator uses the modified Wheeler formula:

Where:

• \( L \) — Inductance in microhenries (μH)
• \( N \) — Number of turns
• \( r \) — Average radius of the coil (cm)
• \( l \) — Length of the coil (cm)
• \( b \) — Depth of the coil (cm)

Explanation: The formula approximates the inductance based on the coil's geometry, accounting for the multilayer structure.

3. Importance of Air Core Inductor Calculation

Details: Accurate inductance calculation is crucial for designing RF circuits, filters, and resonant circuits where precise inductance values are needed.

4. Using the Calculator

Tips: Enter the number of turns, average radius, coil length, and coil depth. All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What's the accuracy of this formula?
A: The formula provides an approximation within about 1% for coils with regular winding patterns.

Q2: What is considered the "average radius"?
A: It's the average of the inner and outer radii of the coil winding.

Q3: When would I use an air core inductor?
A: Air core inductors are used in high-frequency applications where core losses would be problematic.

Q4: How does multilayer affect inductance?
A: Multiple layers increase inductance but also increase parasitic capacitance and resistance.

Q5: What wire gauge should I use?
A: Wire gauge affects resistance and current capacity but not inductance in this calculation.