Optimised hot-via transition with 20 dB return loss for MMIC packaging from dc to 110 GHz

Leigh E. Milner, Shyam G. Mehta, Leonard T. Hall, Simon J. Mahon*, Sudipta Chakraborty, Michael C. Heimlich

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference proceeding contributionpeer-review

1 Citation (Scopus)


A hot-via transition from a monolithic microwave integrated circuit (MMIC) to a printed circuit board (PCB) has been developed with a measured back-to-back insertion loss less than 0.88 dB and return loss higher than 20 dB from dc to 110 GHz. Two techniques are proposed to extend the maximum operating frequency of the microstrip to grounded coplanar waveguide (GCPW) transition. An oversized microstrip line is used on the MMIC to increase capacitance, and a critical return path via in the PCB is positioned near the edge of the hot-via gap to lower inductance. Both techniques improve the maximum operating frequency to 110 GHz for a transition with return loss better than 20 dB and insertion loss of 0.39 dB. To the authors' best knowledge, this MMIC packaging technique demonstrates the highest bandwidth achieved for a dc connected hot-via transition with less than 1 dB back-to-back insertion loss.

Original languageEnglish
Title of host publicationProceedings of the 2021 51st European Microwave Conference (EuMC)
Place of PublicationPiscataway, NJ
PublisherInstitute of Electrical and Electronics Engineers (IEEE)
Number of pages4
ISBN (Electronic)9782874870637
ISBN (Print)9781665447218
Publication statusPublished - 2021
Event51st European Microwave Conference, EuMC 2021 - London, United Kingdom
Duration: 4 Apr 20226 Apr 2022


Conference51st European Microwave Conference, EuMC 2021
Country/TerritoryUnited Kingdom


  • hot-via
  • monolithic microwave integrated circuit (MMIC)
  • integrated circuit packaging
  • interconnect


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