New circuit configurations for designing 0¿180° digital phase shifters

Four novel digital phase shifter configurations are presented. Operation of the new circuits is based upon the phase shifting properties of symmetrical low/high pass LC ladders. In the new designs, the use of ideal microwave switches, loaded lines, switched lines and hybrids is not required. Therefore significant losses which are more apparent at high frequencies, are eliminated. Theoretical analysis indicates that new phase shifter configurations provide improved phase shifting performance over classical approaches. Examples are included to show the merits of the new designs. It is expected that the new phase shifters will find application in the EHF band.