A Miniature 200-GHz Subharmonic Mixer with a Folded 180° Hybrid Using Equal-Length Edge- and Broadside-Coupled Lines

Wei Ling Chang*, Chin-Chun Meng

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

A miniature 180° hybrid is proposed to demonstrate a 200-GHz subharmonic mixer (SHM) using a 0.18-μm SiGe BiCMOS process. The reduced-size 180° hybrid is achieved by folding the shared coupled lines between the in-phase power divider and the out-of-phase Marchand balun. The shared coupled lines demand an equal length design for the coupled lines at both σ and A ports of an 180° hybrid. For the SHM, edge coupling for the σ section and broad-side coupling for the σ section are employed to compensate the different input frequencies at σ and A ports. The SHM achieves a conversion gain around -21 dB from 175 to 200 GHz with 0-dBm LO pumping power. The LO-to-RF isolation is better than 32 dB within the operating bandwidth.

Original languageEnglish
Pages (from-to)338-340
Number of pages3
JournalIEEE Microwave and Wireless Components Letters
Volume28
Issue number4
DOIs
StatePublished - 1 Apr 2018

Keywords

  • 180° hybrid
  • Schottky barrier diode (SBD)
  • SiGe BiCMOS
  • subharmonic mixer (SHM)

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