A Compact Broadband Marchand Balun for Millimeter-wave and Sub-THz Applications

M. Hossain, T. K. Johansen, M. Hrobak, W. Heinrich, V. Krozer

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review


This paper presents a compact broadband millimeter-wave Marchand balun, realized using indium phosphide (InP) transferred substrate (TS) technology. The architecture of this balun is based on a folded-type Marchand balun, modified using a compensating transmission line. The core area of the balun is 0.35 × 0.16 mm2 for operation at W-band. The measured results show a corrected insertion loss of less than 7.5 dB and a return loss better than 10 dB in the frequency range from 70 to 110 GHz. Amplitude and phase imbalance remain below 2 dB and 2.5 degrees, respectively, over a 40 GHz bandwidth. To the authors' knowledge, this is the highest RF center frequency published so far for a broadband Marchand type balun with low phase and magnitude imbalance.

Original languageEnglish
Title of host publicationProceedings of the 2020 German Microwave Conference
Publication dateMar 2020
Article number9080193
ISBN (Electronic)9783982039718
Publication statusPublished - Mar 2020
Event2020 German Microwave Conference - Brandenburg University of Technology Cottbus-Senftenberg , Cottbus, Germany
Duration: 9 Mar 202011 Mar 2020


Conference2020 German Microwave Conference
LocationBrandenburg University of Technology Cottbus-Senftenberg


  • Balun
  • Indium phosphide (InP)
  • Millimeterwave
  • MMIC
  • Transferred-substrate technology


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