Surrogate-assisted EM-driven miniaturization of wideband microwave couplers by means of co-simulation low-fidelity models

Piotr Kurgan; Slawomir Koziel

doi:10.1002/mmce.21152

Surrogate-assisted EM-driven miniaturization of wideband microwave couplers by means of co-simulation low-fidelity models

Abstract

This article proposes a methodology for rapid design optimization of miniaturized wideband couplers. More specifically, a class of circuits is considered, in which conventional transmission lines are replaced by their abbreviated counterparts referred to as slow-wave compact cells. Our focus is on explicit reduction of the structure size as well as on reducing the CPU cost of the design process. For the sake of computational feasibility, a surrogate-based optimization paradigm involving a co-simulation low-fidelity model is used. The latter is a fundamental component of the proposed technique. The low-fidelity model represents cascaded slow-wave cells replacing the low-impedance lines of the original coupler circuit. It is implemented in a circuit simulator (here, ADS) and consists of duplicated compact cell EM simulation data as well as circuit theory-based feeding line models. Our primary optimization routine is a trust-region-embedded gradient search algorithm. To further reduce the design cost, the system response Jacobian is estimated at the level of the low-fidelity model, which is sufficient due to good correlation between the low- and high-fidelity models. The coupler is explicitly optimized for size reduction, whereas electrical performance parameters are controlled using a penalty function approach. The presented methodology is demonstrated through the design of a 1-GHz wideband microstrip branch-line coupler. Numerical results are supported by experimental validation of the fabricated coupler prototype.

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Authors (2)

Piotr Kurgan dr inż.
Slawomir Koziel

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Keywords

MINIATURIZATION

Details

Category:

Articles

Type:

artykuły w czasopismach

Published in:

INTERNATIONAL JOURNAL OF RF AND MICROWAVE COMPUTER-AIDED ENGINEERING no. 28, edition 1,
ISSN: 1096-4290

Language:

English

Publication year:

2018

Bibliographic description:

Kurgan P., Koziel S.: Surrogate-assisted EM-driven miniaturization of wideband microwave couplers by means of co-simulation low-fidelity models// INTERNATIONAL JOURNAL OF RF AND MICROWAVE COMPUTER-AIDED ENGINEERING -Vol. 28,iss. 1 (2018), s.e21152-

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