A new wide-band 180° planar phase shifter network

A new wide-band 180° micro-strip phase shifter network on TP-2 is presented in this paper. The network is composed of coupled lines and double 45° open and short stubs, which are shunted at the edge points of the main line respectively. To demonstrate the design methodology, a new structure 180° phase shifter network, operated at 3.5∼5.5GHz, were designed and fabricated using the design graphs, and were experimented. The measured performances of the phase shifter network were well in agreement with the corresponding the simulation ones over the operating bands, and showed broadband phase characteristics.