rf

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.

post/api/microstrip

Request

  • Base URL: https://calc.engineer
  • URL: https://calc.engineer/api/microstrip
  • Auth: none declared

Request body

z0_ohmnumber

Target characteristic impedance in ohms (default 50)

ernumber

Substrate relative dielectric constant (default 4.6 for FR-4)

height_mmnumber required

Substrate height (dielectric thickness) in millimetres

copper_oznumber

Copper weight in oz/ft2 (1 oz = 0.035 mm thickness)

freq_mhznumber

Optional frequency in MHz for effective wavelength calculation

Response

Computed result for microstrip

toolstring required
versionstring required
computed_atstring date-time required

Changes

No recorded changes to this operation across all 1 revision of this API.