vswr and impedance matching sript

Signal Processing Group Inc. designs, develops and manufactures analog and RF/wireless ASICs and modules

Calculation of PCB characteristic impedance, Capacitance and propagation delay

(DISCLAIMER) Limitations of accuracy based on the W/H ratio for typical PCB parameters (er = 4, H = 30 mil and T = 1.37 mil),

Z0:
0.1 < W/H < 0.2 within 5%
0.2 < W/H < 1.5 within 2%
1.5 < W/H < 2.0 within 5%
2.0 < W/H < 2.7 within 10%
2.7 < W/H < 3.0 within 15%
Co:
0.1 < W/H < 0.2 within 10%
0.2 < W/H < 1.2 within 5%
1.2 < W/H < 2.0 within 10%
2.0 < W/H < 3.0 within 5%

H ( Height of microstrip, thickness of substrate, mm):
W (Width of microstrip, mm):
T (Thicknes of microstrip, mm):
er (Relative permittivity ):

Results

Z0 Value Ohms:
C0 Value pF/mm:
Tpd Value psec/mm:

 

 

Note: The equations that were used in this calculator are:

Equations for the calculation of PCB parameters

Ref: Design Guide for Electronic Packaging Utilizing High-Speed Techniques (4th Working Draft, IPC-2251, February 2001).