# Warning ! MWO simulation inaccuracy !

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#### Kit-the-great

##### Full Member level 3
Some times ago, I'm find a very strange inaccuracy in MWO microstrip model. As I understand, the MWO calculates the electrical length the MLIN element wrong. I'm reveal it, when the 3dB microstrip directional coupler characteristic, designed in MWO, turned out to be shifted into 50 MHz up. I'm compare the results with EW Gene$y$, and obtains the more good comparision with measurement. I'm compares the calculation of microstrip line (w=0.8 mm, l=10 mm) on this substrate (Er=5.3, H=0.5 mm, T=0.035 mm, Tand=0.03) in both programs. Results can be found in attachment. The difference is very large ! Is anybody have the same problem with MWO ?

Best regards,
Kit-the-great