calc.engineer / RF & Antennas / Microstrip

Microstrip v1.0.0

Calculate PCB microstrip trace width for a target characteristic impedance using the Hammerstad-Jensen closed-form equations. Given target impedance (Z0), substrate dielectric constant (er), substrate height, and copper weight, returns the required trace width and effective dielectric constant. Optionally computes effective wavelength at a given frequency. Essential for RF PCB layout to achieve controlled impedance traces (e.g. 50 ohm for SMA connectors). References IPC-2141.

Target characteristic impedance in ohms (default 50)
Substrate relative dielectric constant (default 4.6 for FR-4)
Substrate height (dielectric thickness) in millimetres
Copper weight in oz/ft2 (1 oz = 0.035 mm thickness)
Optional frequency in MHz for effective wavelength calculation
Fill in the inputs and Compute to see the structured result.

From an agent (MCP) or the API

curl -X POST https://calc.engineer/api/microstrip \
  -H "Content-Type: application/json" \
  -d '{"z0_ohm": …, "er": …, "height_mm": …}'

MCP: connect to https://calc.engineer/mcp and call microstrip.

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