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Millimeter-wave coplanar stripline power dividers

Published online by Cambridge University Press:  01 May 2013

Chong Li ,
Lai Bun Lok ,
Ata Khalid ,
Vasileios Papageorgiou ,
James Grant  and
David R. S. Cumming
Chong Li*
Affiliation:
School of Engineering, University of Glasgow, Glasgow G12 8LT, UK. Phone: + 44 141 3306690
Lai Bun Lok
Affiliation:
Department of Electronics and Electrical Engineering, University College of London, London, UK
Ata Khalid
Affiliation:
School of Engineering, University of Glasgow, Glasgow G12 8LT, UK. Phone: + 44 141 3306690
Vasileios Papageorgiou
Affiliation:
School of Engineering, University of Glasgow, Glasgow G12 8LT, UK. Phone: + 44 141 3306690
James Grant
Affiliation:
School of Engineering, University of Glasgow, Glasgow G12 8LT, UK. Phone: + 44 141 3306690
David R. S. Cumming
Affiliation:
School of Engineering, University of Glasgow, Glasgow G12 8LT, UK. Phone: + 44 141 3306690
*
Corresponding author: C. Li Email: chong.li@glasgow.ac.uk
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Abstract

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 millimeter-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 realized using a simple airbridge-based crossover which is compatible with a modern monolithic microwave integrated circuit 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 center frequencies of 25 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.

Keywords

Passive components and circuitsModelingSimulation and characterizations of devices and circuits
Type
Research Papers
Information
International Journal of Microwave and Wireless Technologies , Volume 5 , Special Issue 3: European Microwave Week 2012 , June 2013 , pp. 205 - 212
Copyright
Copyright © Cambridge University Press and the European Microwave Association 2013 

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References

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