K-band 0/180° balanced phase shifter with dc-offset cancellation

H. L. Lee, S. M. Moon, H. J. Dong, M. Q. Lee, J. W. Yu

Research output: Contribution to journalArticlepeer-review

8 Scopus citations


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.

Original languageEnglish
Pages (from-to)1234-1235
Number of pages2
JournalElectronics Letters
Issue number19
StatePublished - 12 Sep 2013


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