Coplanar Waveguide Calculator
Calculate CPW and GCPW impedance and characteristics
CPW Parameters
Grounded Coplanar Waveguide (GCPW)
Calculated Results
Characteristic Impedance
78.45 Ω
Adjust decrease gap or increase width
Effective εr
2.716
Delay
139.62
ps/inch
Velocity
181.9
mm/ns
Gap for 50Ω
100.00 mil
k₀ factor
0.5000
k₁ factor
0.3775
CPW vs GCPW Comparison
CPW (No Ground Plane)
- • Lower loss at high frequencies
- • Less ground current
- • Harder to control impedance
- • More sensitive to nearby structures
- • Best for: RF/microwave, test fixtures
GCPW (With Ground Plane)
- • Better field containment
- • Easier impedance control
- • Lower crosstalk
- • Better for dense layouts
- • Best for: High-speed digital, mixed-signal
For GCPW, ensure coplanar ground is stitched to the reference plane with vias every λ/10 to prevent parallel plate modes and maintain good performance at high frequencies.
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