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question about microstrip lange coupler

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heejing

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lange coupler

why are the s parameters sensive to the length of transmission lines that connect to pins of a lange coupler ?
 

Phase changes, magnitude changes or both?
Magnitude should not cange but phase has to change.
 

both
care about magnitude
i think it's impedance discontinuess
i change the transmission that connect to the pins to
taper , it works ,but a little
the
poblem remains....
 

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