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This paper presents the application of equivalent replacement method for the development of dual-band microwave power distribution devices with arbitrary power division ratio in different frequency bands. The expressions allowing to replace with the equivalent circuits of T-type and P-type a transmission line segment having a different values of characteristic impedance and electrical length at different frequencies are received. For the obtaining of such expressions the method based on the input reactances of reduced partial circuits of even-mode and odd-mode excitation is offered for using. Expression for determination of parameters of the loaded line segment which is used for realization of a reactance with two values of resistance at different frequencies is received also. The examples of calculation and simulation of a dual-frequency power divider and ratrace coupler with power division ratio equal to 2 and 1 at frequencies 2 and 3.6 GHz are given. Keywords-dual band, microstrip divider, rat-race coupler, unequal division of power, equivalent replacement method

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