<html><head><style type='text/css'>p { margin: 0; }</style></head><body><div style='font-family: times new roman,new york,times,serif; font-size: 12pt; color: #000000'>All,<br><br>Has anyone done the formulation for the RF characterization of microstrip? DC is clearly in the examples, but I don't see a microstrip formulation with determination of impedance and phase velocity (beta) in the frequency domain.<br><br>Regards,<br>Dan<br></div></body></html>