Terminator3
Advanced Member level 3
Is it common to make quarterwave sections a little shorter? Can this effect be neglected at 10ghz? If resistor dielectric have high Er phase shift can be significant. I did not found solution yet.
For example i want make Wilkinson power divider in shape of ring. But it can be any shape, for example two 70 Ohm quarterwave lines with 100 Ohm resistor at the end. I can calculate this microstrip ring radius, ring consist of two quarterwave arms, so total line length is lambda/2. This bending is only for reduced size of the divider, and identical to simple lines arrangement.
Then microstrip ring radius is R=L/(2*Pi) = (lambda/2) / (2 *Pi) = lambda / Pi. There would be a gap for placing 100 Ohm resistor. Obviously this resistor must be part of 180 degree phase shift through two arms, so both arms must be shorter than quarterwave.