GND flag for telling whether bottom ground plane is included (1=GCWG, 0=CWG) Rho is the conductance of the signal trace (copper)Įr is the dielectric constant of the substrate Tmet is thickness of the signal trace in meters S is spacing between signal trace and upper ground plane in meters Here are some of my calculations done with wcalc-1.1 Original intention was to tune a PCB trace from the micrstrip's 77.7 Ohms towards 50Ohms by placing ground next to the signal trace. When taking this geometry and calculating the impedance of a GCWG with increasing spacing to the top ground plane, the impedance gets much higher than those of the microstrip line (= GCWG with infinite spacing?).Ĭan somebody explain me why this happens? Maybe the calculators only work for small spacings? Starting point was the geometry of a PCB microstrip line. I tried a few calculations using wcalc-1.1 and the calculator found on. When increasing the spacing between signal trace and upper ground, the effect of the upper ground gets lower and the GCWG slowly turns into a microstrip line. Rick Flitton.Consider a grounded coplanar waveguide (GCWG) implemented on some PCB. TERN Australia’s support for soil science. Julia Jasonsmith.48Īre you a soil citizen scientist and want to help discover new life-saving medicines?.49 ISBN 978-1-74272-389-1 (paperback), ISBN 978-1-74272-392-1 (epub)Īvailable from TERN, The University of Queensland 4072, Australiaįront cover image of soil in hands: Nicolas Rakotopare.įoreword.4 This work is licensed under a CC BY-NC 4.0 license.
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