Analysis of transmission lines loaded with pairs of coupled resonant elements and application to sensors

Naqui, Jordi; Su, Lijuan; Mata, Javier; Martín, Ferrán

doi:10.1016/j.jmmm.2014.12.011

Cited by 8 publications

(1 citation statement)

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“…Nevertheless, there are some differences between the two topologies; one is relative to the position of the resonance frequency in the presence of inter-resonator coupling (above or below the intrinsic resonance frequency of the resonant element) for the symmetric configuration; another is in regard to the fact that under certain conditions a single notch is possible for asymmetric structures in SRR-loaded lines, but not in SIR-loaded lines. These details are treated in depth in [26,34,51]. The interest here is thus to present a proof-of-concept comparator for dielectric measurements.…”

Section: Differential Permittivity Sensors and Comparatorsmentioning

confidence: 99%

Symmetry-Related Electromagnetic Properties of Resonator-Loaded Transmission Lines and Applications

Naqui

Mata

et al. 2015

Applied Sciences

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This paper reviews the recent progress in the analysis and applications of the symmetry-related electromagnetic properties of transmission lines loaded with symmetric configurations of resonant elements. It will be shown that the transmission characteristics of these reactively loaded lines can be controlled by the relative orientation between the line and the resonant elements. Two main types of loaded lines are considered: (i) resonance-based structures; and (ii) frequency-splitting structures. In resonance-based transmission lines, a line is loaded with a single resonant (and symmetric) element. For a perfectly symmetric structure, the line is transparent if the line and resonator exhibit symmetry planes of different electromagnetic nature (electric or magnetic wall), whereas the line exhibits a notch (resonance) in the transmission coefficient if the symmetry planes behave as either electric or magnetic walls (symmetric configuration), or if symmetry is broken. In frequency-splitting lines, paired resonators are typically loaded to the transmission line; the structure exhibits a single notch for the symmetric configuration, whereas generally two split notches appear when symmetry is disrupted. Applications of these structures include microwave sensors (e.g., contactless sensors of spatial variables), selective mode suppressors (of application in common-mode suppressed differential lines, for instance) and spectral signature barcodes, among others.

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Section: Differential Permittivity Sensors and Comparatorsmentioning

confidence: 99%