Fig 1.
Single spurline filter configuration.
Fig 2.
Double spurlines filter configuration.
Fig 3.
Comparison of simulated transmission coefficients for both single and double spurlines filters.
Fig 4.
Design structure of the SSRR sensor with single spurline filter.
Fig 5.
Design structure of the SSRR sensor with double spurlines filter.
Table 1.
Symmetrical split-ring resonator (SSRR) with spurline design specifications.
Fig 6.
Simulated electric field on SSRR sensor with both single and double spurlines.
Fig 7.
Location of measured MUT on the designed sensor.
Fig 8.
Comparison of simulated results for the designed SSRR sensors with/without spurline filters before optimization.
Fig 9.
Comparison of simulated results for the designed SSRR sensors with/without spurline filters after optimization.
Fig 10.
The measured permittivity of the proposed sensors in comparing with standards permittivity of MUT.
Table 2.
Comparison between normal SSRR, single and double spurlines filters.
Fig 11.
The measured permittivity of the proposed sensors in comparing with the standards permittivity of MUT; the bars in green color represents the standard deviations.
Table 3.
Overall summary of experimental results for the SSRR sensors with/without spurline filters.
Fig 12.
Effects of the resonance frequency with respect to change various value of sample’s real permittivity and thickness for SSRR sensor with single spurline.
Fig 13.
Effects of the resonance frequency with respect to change various value of sample’s real permittivity and thickness for SSRR sensor with double spurlines.
Fig 14.
Effects of the sample size in resonant frequency (a) varying length with respect to fixed width and thickness (b) varying width with respect to constant length and thickness.
Fig 15.
Sensitivity response in terms of relative shift and resonance frequency corresponding to various MUT permittivity for SSRR sensor with single spurline and the red bars are representative of the standard deviations.
Fig 16.
Sensitivity response in terms of relative shift and resonance frequency corresponding to various MUT permittivity for SSRR sensor with double spurlines and the red bars are representative of the standard deviations.
Fig 17.
The change of quality factor and transmission when changing the MUT loss tangent for SSRR sensor with single spurline and the red bars are representative of the standard deviations.
Fig 18.
The change of quality factor and transmission when changing the MUT loss tangent for SSRR sensor with double spurlines and the red bars are representative of the standard deviations.