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(a) Measured one-port S-parameters (circles are the reflection coefficients with port 2 grounded; and squares are the reflection coefficients with port 1 grounded) of the negative resistance circuit using a pair of transistors; (b) Calculated equivalent resistances from the measured one-port S-parameters (circles are the resistance seen at port 1 with port 2 grounded; and squares are the resistance seen at port 2 with port 1 grounded).
