In-Phase Power Divider Using Three Parallel Coupled Lines for Medium Power Applications

The design of a compact high power in-phase power divider with planar structure is presented. The proposed device utilizes a stepped impedance T-junction of microstrip line and a pair of three parallel coupled microstrip lines. To realize the required tight coupling for wideband performance, each of the side coupled lines are shorted to the ground. Moreover, one resistor is connected between the two-pair of three-line coupled structure to improve isolation property between the output ports of the device. Both the equivalent circuit and simulation results indicate that the proposed device operates from 1 GHz to 3 GHz with more than 15 dB isolation, 10 dB return loss and less than 0.5 dB of additional insertion loss.