Open AccessDesign of broadband microstrip‐to‐CPW transition
Author(s) -
Tao Ziwen,
Wang Jianpeng,
Dou Yan
Publication year - 2014
Publication title -
electronics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.375
H-Index - 146
ISSN - 1350-911X
DOI - 10.1049/el.2013.2899
Subject(s) - microstrip , return loss , broadband , stub (electronics) , materials science , bandwidth (computing) , resonator , conductor , insertion loss , optoelectronics , wavelength , electrical conductor , coplanar waveguide , optics , electronic engineering , telecommunications , physics , engineering , microwave , antenna (radio) , composite material
A broadband microstrip‐to‐CPW transition is presented. In the proposed structure, the upper microstrip ring is vertically coupled to the central conductor of the lower circular CPW via electromagnetic coupling. To obtain a wide bandwidth of operation, a short‐ended stub is introduced. The introduced short‐ended stub combined with the open‐ended microstrip ring constructs a quarter‐wavelength resonator. A sample transition has been designed and measured. Experimental results indicate that over 129% bandwidth with better than 10 dB return loss and below 1.7 dB insertion loss can be obtained.