Broadband 180° bit phase shifter using a λ/2 coupled line and parallel λ/8 stubs

In this paper, a broadband 180degrees bit phase shifter using a new switched-network was presented. The new network is composed of a lambda/2 coupled line and parallel lambda/8 open and short stubs, which are shunted at the edge points of a coupled line, respectively. According to a desired phase, shift, it provides a controllable phase dispersive characteristic by the proper determination of Z(m), Z(s) and R values. The 180degrees bit phase shifter operated at 3 GHz was fabricated and experimented using design graphs which provide the required Z(m), Z(s) values, and I/O match and phase bandwidths. The experimental performances showed broadband characteristics.