Millimeter-wave coplanar stripline power dividers

Li, C. , Lok, L.B., Khalid, A. , Papageorgiou, V., Grant, J. and Cumming, D.R.S. (2013) Millimeter-wave coplanar stripline power dividers. International Journal of Microwave and Wireless Technologies, 5(3), pp. 205-212. (doi: 10.1017/S1759078713000421)

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We present the design, fabrication and measurement of a 2-way modified Wilkinson divider constructed in a coplanar geometry exhibiting ultra wideband isolation, transmission and port matching in the millimetre-wave frequency range. The proposed divider replaces the lumped resistor in the conventional Wilkinson divider with two quarter-wave length transmission lines, a phase inverter and two 2Z0 resistors. Except for the three ports that are coplanar waveguides (CPWs), the main body of the divider uses coplanar striplines (CPS). The phase inverter is realised using a simple airbridge-based crossover which is compatible with a modern MMIC process. The divider has a ring-like configuration fabricated on a 620 µm thick semi-insulating GaAs wafer using electron beam lithography (EBL) technology. Three dimensional (3D) full-wave electromagnetic simulations have been carried out to optimize the design and investigate the possible effect of fabrication tolerance on the performance of the crossover and the divider. Two dividers working at centre frequencies of 25 GHz and 80 GHz have been designed, fabricated and tested. They all show consistent performance in terms of bandwidth, isolation, and port matching. Experimental and simulation results are in excellent agreement.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Li, Dr Chong and Cumming, Professor David and Lok, Dr Lai Bun and Grant, Dr James and Khalid, Dr Ata-Ul-Habib
Authors: Li, C., Lok, L.B., Khalid, A., Papageorgiou, V., Grant, J., and Cumming, D.R.S.
Subjects:T Technology > TK Electrical engineering. Electronics Nuclear engineering
College/School:College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
Research Group:Microsystem Technology
Journal Name:International Journal of Microwave and Wireless Technologies
Publisher:Cambridge University Press
ISSN (Online):1759-0795

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
497131Novel Thermal Management Concepts: High Power High Frequency Planar Gunn DiodeDavid CummingEngineering & Physical Sciences Research Council (EPSRC)EP/H011862/1ENG - ENGINEERING ELECTRONICS & NANO ENG