A novel ultra-wideband 90 degrees GaAs MMIC phase shifter with either analogue or digital control

Design, fabrication and characterization of a novel ultra-wideband, GaAs MMIC digital/analogue compatible 90/spl deg/ phase shifter is described over 5 to 20 GHz band. The topology was specifically selected to minimize process variations on performance. Low peak phase error, PPE (<5 degree), low VSWR (<1.5), low insertion loss variations (<3.0/spl plusmn/0.6 dB) and good phase shift linearity with the control voltage of MESFET's gates for analogous state are exhibited over 5 to 20 GHz frequency range. The chip size of the MMIC phase shifter is 4.2 mm/spl times/0.56 mm/spl times/0.1 mm.