Synthesis of slow-wave structures based on capacitive-loaded lines through aggressive space mapping (ASM)

Marco Orellana, Jordi Selga, Marc Sans, Ana Rodríguez, Vicente Boria, Ferran Martín

Research output: Contribution to journalArticleResearchpeer-review

18 Citations (Scopus)


© 2015 Wiley Periodicals, Inc. This article is focused on the automated synthesis of slow-wave structures based on microstrip lines loaded with patch capacitors. Thanks to the presence of the shunt capacitors, the effective capacitance of the line is enhanced, and the phase velocity of the structure can be made significantly smaller than the one of the unloaded line. The target is to achieve the layout of the slow-wave structure able to provide the required slow-wave ratio, characteristic (Bloch) impedance and electrical length (i.e., the usual specifications in the design of slow-wave transmission lines). To this end, a two-step synthesis method, based on the aggressive space mapping (ASM) algorithm, is proposed for the first time. Through the first ASM algorithm, the circuit schematic providing the target specifications is determined. Then, the second ASM optimizer is used to generate the layout of the structure. To illustrate the potential of the proposed synthesis method, three application examples are successfully reported. The two-step ASM algorithm is able to provide the layout of the considered structures from the required specifications, without the need of an external aid in the process.
Original languageEnglish
Pages (from-to)629-638
JournalInternational Journal of RF and Microwave Computer-Aided Engineering
Issue number7
Publication statusPublished - 1 Jan 2015


  • microwave circuits optimization
  • planar components miniaturization
  • slow-wave transmission lines
  • space mapping


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