Open AccessLow‐loss broadband (DC to 220 GHz) S‐CPW to S‐CPS transition for S‐CPS coplanar probing
Author(s) -
Saadi A.A.,
MargalefRovira M.,
Vincent L.,
Lepilliet S.,
Gaquiere C.,
Ferrari P.
Publication year - 2019
Publication title -
electronics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.375
H-Index - 146
eISSN - 1350-911X
pISSN - 0013-5194
DOI - 10.1049/el.2019.2377
Subject(s) - coplanar waveguide , stripline , strips , insertion loss , transmission line , broadband , electrical engineering , optoelectronics , materials science , return loss , electric power transmission , engineering , telecommunications , microwave , antenna (radio) , composite material
The practical issue of probing coplanar stripline (CPS) structures is addressed in this Letter. A compact slow‐wave coplanar waveguide (S‐CPW) to slow‐wave CPS (S‐CPS) transition was designed and fabricated in a 55 nm BiCMOS process of STMicroelectronics. The signal strips of the slow‐wave CPW and slow‐wave CPS have been directly connected while the ground strips have been tied together through combination of transmission lines laid out on the top metal layer of the back‐end‐of‐line of the technology. Thanks to its flexibility, the proposed transition can be resized to match with a wide range of slow‐wave CPS slot. Tested from DC to 220 GHz, the back‐to‐back transition structure showed insertion loss lower than 1.4 dB and return loss better than 15 dB, respectively. To the best of author's knowledge, it is the first integrated slow‐wave CPW/CPS transition introduced within the mentioned mm‐wave band.