A NOVEL ULTRAWIDEBAND MICROWAVE DIFFERENTIAL PHASE-SHIFTER

Wideband microwave phase shifters are usually constructed using cascad ed coupled-line sections connected together at their far ends. By util izing the unique frequency-independent quadrature property of symmetri c couplers, a new class of phase shifter is proposed. The use of ultra wideband couplers In its realization results in a device which offers greater freedom with respect to bandwidth and ripple. The tendency of symmetrical networks to cancel smalt errors due to manufacturing toler ances is also exploited in order to improve its high-frequency perform ance.