Coplanar Waveguide Calculator & Formula
By RF Wireless Expert Team
Advertisement
Coplanar waveguides (CPW) are popular in RF and microwave PCB design due to their easy integration and low dispersion. Accurate calculation of impedance and effective permittivity is essential for reliable circuit performance.
EXAMPLE:
INPUTS:
- Center Conductor Track Width (S) = 2.5 mm
- Gap Width (W) = 1.5 mm
- Dielectric Thickness (h) = 2.0 mm
- Relative Dielectic Constant (Er) = 4.2
OUTPUTS:
- Effective Dielectric Constant (Eeff) = 3.22
- Characteristic Impedance = 70.76 Ohms
Coplanar Waveguide (CPW) Formula
Summary: This page explains CPW fundamentals and provides formulas with a calculator to determine key transmission line parameters, making it useful for RF layout and microwave circuit design.
References for further study
- Pozar, Microwave Engineering (CPW impedance uses elliptic integrals)
- SciPy Documentation - ellipk(m) definition and parameter convention
- Research paper: Open source numerical algorithms for elliptic integrals (AGM, Gauss Legendre, etc.)
- Abramowitz & Stegun, Handbook of Mathematical Functions
Explore More Waveguide Calculators
- Air Filled Rectangular Waveguide Calculator
- Air Filled Circular Waveguide Calculator
- Circular Waveguide Cutoff Frequency Calculator
- Rectangular Waveguide Breakdown Power Calculator
- Rectangular Waveguide Cutoff Frequency Calculator
- Waveguide Bend Chamfer Formula & Calculator
Continue Learning Microwave Waveguide
- Waveguide Basics Tutorial: Types, Modes, Cutoff Frequency, Pros & Cons
- Rectangular vs. Circular Waveguide
- Rectangular Waveguide Dimensions chart
- TEM Waves and Waveguide Modes: A Comprehensive Overview
- What is Dominant Mode in Rectangular & Circular Waveguide
- Frequency Bands used in Waveguide
- Advantages & Disadvantages of Microwave Waveguide
- Waveguide Vs. Coaxial Line : Key Differences