![]() 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. Consider a grounded coplanar waveguide (GCWG) implemented on some PCB.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |