EM-driven design of recurrent slow-wave structures

Kurgan, Piotr; Koziel, Slawomir; Cheng, Qingsha S.

doi:10.1109/nemo.2017.7964236

Cited by 1 publication

(2 citation statements)

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“…This problem has been addressed in Refs. and using surrogate‐assisted optimization techniques involving an underlying kriging interpolation surrogate. Unfortunately, data‐driven models developed for multidimensional design space and valid for wide ranges of geometry parameter values are inherently lacking accuracy.…”

Section: Introductionmentioning

confidence: 99%

“…The major contributions of this work include (1) development of a computationally cheap low‐fidelity model of the cell cascade whose topology (in the sense of the number of cascaded elements) can be easily adjusted without any additional costs, (2) improvement of the reliability of the design procedure in comparison to prior works on the subject (e.g., Refs. and ), so that no further fine‐tuning is necessary, and (3) providing a systematic comparison and reliable selection of coupler topology that translates into the smallest layout among considered options.…”

Section: Introductionmentioning

confidence: 99%

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Rapid surrogate-assisted design optimization of minimum-size broadband branch-line couplers with variable topology

Kurgan

Koziel

2018

Int J RF Microw Comput Aided Eng

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This work discusses simulation‐driven design of miniaturized wideband branch‐line couplers with a variable topology. Size reduction is enabled here by replacing uniform transmission lines of the original coupler with slow‐wave structures in the form of cascaded compact cells and meander lines. The primary goal is to determine a number of cells in the cascade and particular cell dimensions for which the minimum size of the coupler as well as its required operating conditions are ensured. To this end, we employ a surrogate‐assisted technique involving a trust‐region gradient search framework. Computational efficiency of the design process stems from estimating the Jacobian of circuit responses at the level of a low‐fidelity model of the cascade. The latter is composed in a circuit simulator from duplicated EM‐evaluated data blocks of a single cell and is well correlated with the corresponding high‐fidelity model. The key advantage of this work is the utilization of a reconfigurable, cheap, and well‐aligned low‐fidelity model. The proposed approach is demonstrated through design of a minimum‐size two‐section branch‐line coupler with quasi‐periodic dumbbell‐shaped cells and meander lines. Excellent circuit performance as well as its small size showcase the reliability and usefulness of the presented method. Experimental verification is also provided.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%