A high-isolation and highly linear super-wideband SPDT Switch in InP DHBT Technology

Tanjil Shivan, Maruf Hossain, Ralf Doerner, Tom Keinicke Johansen, Ksenia Nosaeva, Hady Yacoub, Wolfgang Heinrich, Viktor Krozer

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


This work presents an SPDT switch with more than 235 GHz bandwidth, fabricated using 800 nm InP DHBT technology. Three cascaded shunt stages were used to achieve high isolation and relatively large transistors within the 90-325 GHz operating range. The three stage design enhances the isolation and wideband property at the expense of slightly higher insertion loss. Within the full BW, an average isolation of >40 dB and an average insertion loss of 3-6 dB are achieved. Linearity measurements at 100 GHz yield a input referred PINldB of more than 16 dBm, which is close to the highest reported value for InP DHBT based SPDT switches at this frequency. To the authors' best knowledge, this is the widest bandwidth of an SPDT switch achieved in any MMIC technology. This ultra-wideband switch with its high input referred PINldB opens up new possibilities for multi-band mm-wave and THz spectroscopy, ultra-wideband radar systems and multiband measurement instruments.
Original languageEnglish
Title of host publicationProceedings of 2020 IEEE/MTT-S International Microwave Symposium
Number of pages4
Publication date2020
ISBN (Print)9781728168159
Publication statusPublished - 2020
Event2020 IEEE/MTT-S International Microwave Symposium - Los Angeles, United States
Duration: 21 Jun 202026 Jun 2020


Conference2020 IEEE/MTT-S International Microwave Symposium
CountryUnited States
CityLos Angeles
SeriesI E E E - M T T S International Microwave Symposium. Digest


  • Single-Pole-Double-Throw switch
  • InP double heterojunction bipolar transistor (DHBT)
  • Monolithic microwave integrated circuit (MMIC)
  • High isolation SPDT switch

Fingerprint Dive into the research topics of 'A high-isolation and highly linear super-wideband SPDT Switch in InP DHBT Technology'. Together they form a unique fingerprint.

Cite this