IndieRF Transmission Line Calculator

PCB and chip-and-wire transmission line calculator

Size 50 Ω microstrip, stripline, GCPW, and CPW. Compare insertion loss across substrate materials and popular PCB finishes — ENIG, ENEPIG, OSP, immersion silver, and immersion tin — or gold chip-and-wire on ceramic and GaAs.

IndieRF Transmission Line Calculator

PCB traces and chip-and-wire

Mask t (um)

Relief (mil)

⏚⏚⏚⏚⏚Rogers RO4350B (εr=3.66, tanδ=0.0037)8 mil reliefW = 13.69 milh = 6.60 milt = 17.5 um

Loss sweep · dB/in

X GHz

Y dB

0.00.51.01.52.00.1 GHz5 GHz10 GHz15 GHz20 GHz

Loss breakdown @ eval

  • Base Cu38.4%
  • Plating25.1%
  • Roughness25.3%
  • Dielectric10.7%
  • Mask0.5%

Skin depth vs plating

99.8% of current in the plating shell, 0.2% in the copper core.

Foil Reverse treated (RTF): Rq = 1.2 um · Huray a = 0.7 um, As/Af = 1.4

  • Goldt=0.05 um · δ=0.79 um · 6.2%

    σ = 4.10e7 S/m

  • Nickelt=4.50 um · δ=0.72 um · 93.7%

    σ = 1.40e7 S/m · μr = 3.5

  • Copper coret=17.50 um · δ=0.66 um · 0.2%

    σ = 5.80e7 S/m