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This paper provides sensitivity analysis of complementary diplexers which are used for dividing the frequency spectrum into two adjacent frequency bands. Analytical expressions of the semirelative first-order sensitivity of the transducer losses are derived. These sensitivity expressions indicate that the passband loss sensitivity of a complementary diplexer is substantially lower than that of doubly resistively terminated reactance networks which are known to have a low sensitivity. Numerical simulations are included, supporting the theoretical results.