A two-port linear network is classified as reciprocal if its Z-parameters satisfy which condition?
AZ11 = Z22
BZ11 * Z22 = Z12 * Z21
CZ12 = -Z21
DZ12 = Z21
Explanation
A network is reciprocal if transfer impedance from port 1 to port 2 equals transfer impedance from port 2 to port 1, meaning Z12 = Z21.

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