Evaluation of the Equivalent Lumped Element Parameters of Modified Microstrip Ring Resonator


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Microstrip ring resonator (MRR) sensor was modeled by simple equivalent lumped element circuits in free space based on simulation data obtained from Microwave Office (AWR) simulator and comparison was made with the measurements using the E5071C Network Analyzer. The calculated reflection coefficient, |G| and complex input impedance Zin using lumped element model were compared with the measurements results. Both results showed well agreement with a little discrepancy, basically due to imperfect soldering. The MRR was designed to have operating frequencies between 0.5 GHz and 4.5 GHz. The maximum surrounding of magnetic field, Hϕ is within 15 A/m in free space.



Edited by:

Dr. Denni Kurniawan, Fethma M. Nor and Rozzeta Dolah




Y. L. Then et al., "Evaluation of the Equivalent Lumped Element Parameters of Modified Microstrip Ring Resonator", Applied Mechanics and Materials, Vol. 735, pp. 278-281, 2015

Online since:

February 2015




* - Corresponding Author

[1] P. A. Bernard and J. M Gautray, Measurement of dielectric constant using a microstrip ring resonator, IEEE Trans. Geosci. Remote Sensing. 28 (1990) 325-336.

[2] K. Sarabandi and E. S. Li, Microstrip ring resonator for soil moisture measurements, IEEE Trans. Geosci. Remote Sensing. 35 (1997) 1223-1231.

DOI: https://doi.org/10.1109/36.628789

[3] A. Rashidian, M. T. Aligodarz, and D. M. Klymyshyn, Dielectric characterization of materials using a modified microstrip ring resonator technique, IEEE Trans. Dielectrics and Electrical Insulation 19 (2012) 1392-1399.

DOI: https://doi.org/10.1109/tdei.2012.6260016

[4] K. Y. You and H. K. Mun, Dielectric measurement using a planar ring sensor for low-loss powder form materials, Progress in Electromagnetic Research Symposium Proceedings (2012) 1385-1388.

[5] K. Chang, Microwave Ring Circuits and Antennas, Wiley, New York, (1996).

[6] B. S. Yarman, Design of Ultra Wideband Antenna Matching Networks, Springer Science, Germany, (2008).

[7] Y. L. Then, K. Y. You, M. N. Dimon, T. S. Tan, and C. Y. Lee, Dielectric characterization of various soil types using modified microstrip ring resonators techniques, Microw. Opt. Tech. Lett. 56 (2014) 2498-2502.

DOI: https://doi.org/10.1002/mop.28623

[8] R. M. Foster, A reactance theorem, Bell Sys. Tech J. 3 (1924) 259-267.

[9] W. J. R. Hoefer and A. Chattopadhyay, Evaluation of the equivalent circuit parameters of microstrip discontinuities through perturbation of a resonant ring, IEEE Trans. Microwave Theory and Techniques 23 (1975) 1067-1071.

DOI: https://doi.org/10.1109/tmtt.1975.1128746