Analysis and design of coplanar waveguide for high-speed pulse propagation on printed circuit board

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Date
2007-09-01
Authors
Mohd Muhalyiddin Abdullah
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The goals of this thesis are to investigate a suitable printed circuit board (PCB) coplanar waveguide (CPW) for high-speed Signal propagation application, to conduct thorough analyses of its propagation characteristic and to compare its performance against the mainstream microstrip line. Design equations are developed by adopting expressions that are originally proposed for monolithic microwave integrated circuit (MMIC) and silicon CPW. Then, these equations are employed for optimized CPYI designs whereby the results are compared to simulations outputs for sanity checks that showed 15% differences. Extensive frequency and time domain numerical analyses are conducted to access the impacts of each CPW parameters to signal propagation performance. Subsequently, a prototype circuit is built to verify theoretical and simulations results. Experiment results show excellence correlations to theoretical estimates as well as exposed some potential issues. Contrary to popular beliefs that CPW has superior performance than microstrip based on MMIC experience, this thesis unveiled various CPYI issues for larger scale PCB implementation such as severe lateral and longitudinal resonances. Interestingly, these issues are not detected by ADS simulations using the built-in CB-CPW model or by the design equations. Thus, the thesis has successfully proposed alternatives approaches for ADS simulations and design equations for more realistic predictions of the actual circuit characteristics. Lastly, a few potential research topics on PCB CPW structures were highlighted for further researches for making CPW to be more compelling for high-speed PCB implementations.
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