Low-loss ultra-wideband transition between conductor-backed coplanar waveguide and substrate integrated waveguide

• Published in: 2009 IEEE MTT-S International Microwave Symposium Digest pp. 349 - 352
• Main Authors: Xiao-Ping Chen, Ke Wu
• Format: Conference Proceeding
• Language: English
• Published: IEEE 01.06.2009
• Subjects: Calibration; Circuits; conductor-backed coplanar waveguide (CBCPW); Coplanar waveguides; generalized impedance inverter; Impedance; Inverters; Millimeter wave technology; numerical Thru-Reflection-Line (TRL) calibration; Planar waveguides; Substrate Integrated Waveguide (SIW); transition; Ultra wideband technology; Waveguide components; Waveguide transitions
• ISBN: 1424428033; 9781424428038
• ISSN: 0149-645X
• DOI: 10.1109/MWSYM.2009.5165705

A novel transition between conductor-backed coplanar waveguide (CBCPW) and substrate integrated waveguide (SIW) is presented for microwave and millimeter-wave integrated circuit design. The proposed integrated transition that can provide simultaneous field and impedance matching, exhibits outstanding low-loss performances over an ultra-wideband range (entire Ka-band in our case). In this work, a generalized impedance inverter whose parameters are accurately extracted by the use of a numerical Thru-Reflection-Line (TRL) calibration technique is utilized to design the transition. Measured results for the fabricated transition in back-to-back configuration show that the insertion loss is better than 0.4 dB while the return loss is better than 20 dB over the entire Ka-band.