K‐band 0/180° balanced phase shifter with dc‐offset cancellation. Issue 19 (1st September 2013)

• Record Type: Journal Article
• Authors: Lee, H.L.; Moon, S.‐M.; Dong, H.‐J.; Lee, M.‐Q.; Yu, J.‐W.
• Is Part Of: Electronics letters. Volume 49:Issue 19(2013)
• Page Start: 1234
• Page End: 1235
• Publication Date: 2013-09-01
• Subjects: field effect MMIC -- gallium arsenide -- HEMT integrated circuits -- III‐V semiconductors -- MMIC phase shifters -- modulators -- quadrature phase shift keying -- transmission lines; GaAs -- size 2.85 mm -- size 2.2 mm -- frequency 17.5 GHz to 22.5 GHz -- loss 4.5 dB -- size 0.15 mum -- isolation port -- low noise pHEMT process -- quarter‐wave transmission lines -- Lange couplers -- QPSK modulator -- quadrature phase shift keying -- BPSK modulator -- DC offset cancellation -- 0/180° balanced phase shifter MMIC; Electronics -- Periodicals; 621.381
• DOI: 10.1049/el.2013.1666
• Languages: English
• ISSNs: 0013-5194

Abstract

Abstract : K‐band 0°/180° phase shifter MMIC based on balanced structure which can be applied to BPSK or QPSK modulator with dc‐offset cancellation is presented. The proposed balanced phase shifter consists of four Lange couplers, two quarter‐wave transmission lines and four switches for open and short terminations. The proposed structure implemented in GaAs 0.15‐µm low noise pHEMT process ensures stable 0/180° phase shift while common‐mode signals due to the mismatch in reflections by open and short are fed to the isolation port. The proposed phase shifter is verified by the phase shift of 179 ± 1.5° with the insertion loss of 4.5 ± 0.8 dB from 17.5 to 22.5 GHz. The fabricated phase shifter size is 2.2 × 2.85 mm including test pads.