Analysis of three-conductor coupled-line 180° hybrid for single-balanced subharmonic mixer design in 0.15-μ m pHEMT technology

Chun Chi Su, Chih Ming Lin, Shih Han Hung, Chia Chen Huang, Yeong Her Wang

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)


A novel 180° hybrid with two λ/4 sections of three-conductor coupled-line structure inhered different operating frequencies with overlapped characteristic and perfect isolation between the σ-port and δ-port is employed to implement a Ka-to M-band single-balanced subharmonic mixer (SHM) in a 0.15-μ m GaAs pHEMT process with a compact die size of less than 0.82 × 0.83 mm 2. The thorough analysis based on the scattering matrix of the 180 ° hybrid is also presented. Incorporating the inherent features of the 180 ° hybrid with an antiparallel diode pair configuration, the proposed SHM achieved a wide operating bandwidth from 37 to 85 GHz with low conversion loss from 9 to 14 dB, enhanced local oscillation (LO)-to-RF isolation and 2LO-to-RF isolation under 10-dBm LO power level. This proposed architecture is really attractive to SHM design in modern millimeter-wave territory.

Original languageEnglish
Article number6867387
Pages (from-to)2405-2414
Number of pages10
JournalIEEE Transactions on Microwave Theory and Techniques
Issue number10
Publication statusPublished - 2014 Oct

All Science Journal Classification (ASJC) codes

  • Radiation
  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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