3.3-3.7 GHz 180° hybrid coupler design

This paper presents a novel wide band microstrip coupler, composed of two parts. The first one is a compensated Wilkinson power divider which provides a good separation between the two output ports. The second is a passive phase shifter composed of two filters consisting of 3 dB 180° hybrid couplers, the coupled and transmitted port being short circuited or open circuited on the bottom and top surfaces of printed circuit board. The results of the theoretical analysis are presented. The simulation results presented below are valid over the 3.3-3.7 GHz band and contain the coupling between input and output ports as well as phase shift isolation 3.3 dB and 178 degree and 20 dB.