Splitter/combiner microstrip sections loaded with pairs of Complementary Split Ring Resonators (CSRRs): Modeling and optimization for differential sensing applications

Lijuan Su, Javier Mata-Contreras, Paris Velez, Ferran Martin

Research output: Contribution to journalArticleResearchpeer-review

64 Citations (Scopus)

Abstract

© 1963-2012 IEEE. This paper focuses on the analysis of splitter/ combiner microstrip sections where each branch is loaded with a complementary split ring resonator (CSRR). The distance between CSRRs is high, and hence, their coupling can be neglected. If the structure exhibits perfect symmetry with regard to the axial plane, a single transmission zero (notch) at the fundamental resonance of the CSRR, arises. Conversely, two notches (i.e., frequency splitting) appear if symmetry is disrupted, and their positions are determined not only by the characteristics of the CSRRs but also by the length of the splitter/combiner sections. A model that includes lumped elements (accounting for the CSRR-loaded line sections) and distributed components (corresponding to the transmission lines) is proposed and used to infer the position of the transmission zeros. Frequency splitting is useful for the implementation of differential sensors and comparators based on symmetry disruption. Using the model, the length of the splitter/combiner sections necessary to optimize the sensitivity of the structures as sensing elements is determined. Parameter extraction and comparison with electromagnetic simulations and measurements in several symmetric and asymmetric structures is used to validate the model. Finally, a prototype device sensor/comparator based on the proposed CSRR-loaded splitter/combiner microstrip sections is presented.
Original languageEnglish
Article number7745969
Pages (from-to)4362-4370
JournalIEEE Transactions on Microwave Theory and Techniques
Volume64
Issue number12
DOIs
Publication statusPublished - 1 Dec 2016

Keywords

  • Circuit modeling
  • complementary split ring resonators (CSRRs)
  • microstrip technology
  • microwave sensors

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