hi,johnjoe ,thnx a lot
the board is hand-made,i have had EM-simulation in layout window and co-simulation in a new schematic window,both the results r very good,S11 is at least 20dB and other indexs r as well as good.the mismatches u mentioned r considered by me,then i checked my schematic,i think the circuit matched.i think the Er probably changed when board is corrosioning.
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hi,volker,
thnx for ur advice,so can u tell me how to improve the transition ,namely,reduce the discontinuity?