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The electrical wavelength of a microstrip circuit is longer than the wavelength of a stripline circuit. The reason is the change in the effective epsilon value. So your PCB will get smaller if you change from microstrip to stripline.
AppCad from Agilent is a nice tool to calculate impedances and electrical wavelengths of such transmission lines.
I think the number of via will be increased when changing wicrostrip circuit to stripline circuit, which will increase the loss of signal. And also, it's difficult to tune.
More thinner than Microstripeline
you may put a little inductor on both side of stripline,because of the via can effect the signal like adding a little capacitor; or you may have a half wave length for the stripline to minimize the via effect.
Microstripline is easy to adjust by a knife ,but stripline is a gamble.
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