Two Options of 3-dB Microstrip Coupled-Line Power Dividers Terminated with Frequency-Dependent Complex Impedances

Two options of power divider with complex frequency-dependent impedances both of source and of loads is proposed. In the first case, a scheme of the Wilkinson power divider based on the coupled line segment and added at the input by a single line segment is considered. The second variant of the power divider is based on a symmetrical 4-port scheme, in which one of the ports remains open. Unlike the previous one, this circuit is formed by two segments of coupled lines. For both options of the circuits, methods for calculation the electrical parameters of their elements are proposed, taking into account that the phase velocities of the coupled-lines even and odd modes are different. The theoretical predictions are validated by simulation results of proposed circuits.