Broadband MMIC Phase Shifters Based on CRLH Circuit

Broadband phase shifters based on CRLH circuit have been successfully developed. Proposed phase shifters employing HPF/CRLH and CRLH/CRLH topology overcome the bandwidth limitation of the conventional HPF/LPF phase shifter. To verify this methodology, 45deg. and 22.5deg. MMIC phase shifters have been fabricated. The 45deg. MMIC phase shifter utilizing HPF/CRLH topology has achieved the phase shift of 45deg. ± 6deg. in 4-16 GHz. The 22.5deg. MMIC phase shifter employing CRLH/CRLH circuit has demonstrated the phase shift of 22.5deg. ± 3deg. at the same frequency band.