文献类型：期刊文献

英文题名：A Compact Broadband Transition From Ground Coplanar Waveguide to Folded SIW

作者：Ji, Lei[1];Xu, Qihao[1];Zhang, Yue[2];Li, Xiao-Chun[1]

机构：[1]Shanghai Jiao Tong Univ, State Key Lab Radio Frequency Heterogeneous Integr, Shanghai 200240, Peoples R China;[2]East China Univ Sci & Technol, Sch Informat Sci & Engn, Shanghai 200237, Peoples R China

年份：2026

外文期刊名：IEEE MICROWAVE AND WIRELESS TECHNOLOGY LETTERS

收录：;EI(收录号：20260720087430);WOS:【SCI-EXPANDED(收录号:WOS:001691139200001)】；

基金：This work was supported in part by the National Natural Science Foundation of China under Grant 62371284 and Grant 62188102; and in part by the Joint Foundation of Key Laboratory of Shanghai Jiao Tong University-Xidian University, Ministry of Education under Grant LHJJ/2024-1 and Grant LHJJ/2025-01.

语种：英文

外文关键词：Metals; Impedance; Transformers; Waveguide transitions; Bandwidth; Substrates; Coplanar waveguides; Loss measurement; Broadband communication; Reflection coefficient; Broadband; coplanar waveguide ground coplanar waveguide (GCPW) to folded substrate-integrated waveguide (FSIW) transition; slow wave effect (SW); tapered strip line (TSL)

摘要：In this letter, a compact and broadband ground coplanar waveguide (GCPW) to folded substrate-integrated waveguide (FSIW) transition is proposed by using a metallic blind via and a modified tapered strip line (TSL) in the middle layer. The modified TSL incorporates five U-shaped groove structures of different sizes and a pair of interdigital structures on a conventional tapered quarter-wavelength transformer. The subwavelength U-shaped groove structures provide a significant slow wave effect, reducing the longitudinal size of the quarter-wavelength transformer while enhancing the operating bandwidth. To verify the results, back-to-back transitions are fabricated and measured. The measurement results show that the proposed structure operates at 7.8-22.0GHz with reflection coefficient more than -10 and -10-dB fractional bandwidth (FBW) of 95%. Compared to the GCPW-to-FSIW transition using the traditional quarter-wavelength transformer, the proposed transition can increase the bandwidth and reduce the physical length of the quarter-wavelength transformer from 4.3 to 2.2mm, achieving a 49% miniaturization of the longitudinal length.