A NEW STRUCTURE OF MICROWAVE ULTRAWIDE-BAND DIFFERENTIAL PHASE-SHIFTER

A new structure for TEM transmission line ultrawide-band differential phase shifters is proposed. This consists of a cascade of two-ports, e ach of which is a single coupled section with parallel transmission li nes connected to each other at one end. The section lengths and coupli ng coefficients are different The results of numerical synthesis have been tabulated for phase shifters of 90 degrees differential phase shi ft. The proposed structure has the advantage of a lower coupling coeff icient and improved phase-frequency characteristic in comparison with the other stepped phase shifters.