Coplanar waveguide characteristic impedance calculator

The calculator allows you to calculate the parameters of a coplanar stripline waveguide, with or without a ground on the PCB bottom side. Such waveguides are an alternative to the microstrip line, when the signal and ground conductors are in the same plane (hence the name). Each of the waveguide alternatives has its own advantages and disadvantages. Among the advantages of the coplanar, it should be noted less frequency dispersion, greater suitability for mounting an SMA connector on a PCB, and less stray coupling and radiation.

Javascript source code:
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The calculator is based on source codes: ©1996-2009 Daniel R. McMahill
Limitations and features of antenna calculations

To verify and evaluate the error of this calculator, the characteristic impedances of a number of coplanar waveguides with the substrate dielectric constant εr=4.4 were calculated, with a strip thickness of t=0.035 mm, using ANSYS 2D EXTRACTOR electromagnetic simulator. The calculation results are presented in the form of tabular data:

Characteristic impedance of a coplanar waveguide with bottom side ground

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Characteristic impedance of a coplanar waveguide without bottom side ground

Literature:

• Coplanar Waveguide Analysis/Synthesis Calculator (Copyright © 1996-2009 Daniel R. McMahill) - prototype of this calculator;
• Brian C Wadell, "Transmission Line Design Handbook", 1991 Artech House Inc., pp 73-80;
• M. A. R. Gunston, "Microwave Transmission-line Impedance Data", 1972 Van Nostrand Reinhold Company Inc., p 54;

Related links:

1. Coplanar Waveguide Analysis/Synthesis Calculator - ©1996-2009 Daniel R. McMahill, prototype of this calculator;
2. Microstrip waveguide characteristic impedance calculator;