Improved Resonator Method for Microwave Testing of Magnetic Composite Sheets

Jha, Abhishek; Akhtar, M. Jaleel

doi:10.1109/tmag.2015.2431996

Cited by 17 publications

(2 citation statements)

References 33 publications

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“…So the depolarization factor must be redefined because the sample length is smaller than the width of the cavity, and especially when the ratio of sample length to cavity width is less than 0.7 [18]. Also, the permeability and permittivity have been measured in earlier studies by placing the specimen at a non-radiating slot in the E-plane of the rectangular cavity [17], [23].…”

Section: Introductionmentioning

confidence: 99%

An Improved Cavity-Perturbation Approach for Simultaneously Measuring the Permittivity and Permeability of Magneto-Dielectric Materials in Sub-6G

Zhang

et al. 2021

IEEE Access

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Magneto-electric materials with low loss have prospective applications in microwave systems as they enable miniaturization and broadband impedance matching. Two example applications are antennas and filters in sub-6G communication systems. Therefore, high-accuracy and wideband testing are critical for magneto-electric materials, whose complex permittivity and permeability are usually dependent on frequency. In this paper, the mutual interference between the electric and magnetic field within magneto-electric material samples was seriously considered. It was found that the results calculated with the original perturbation formula were overestimated when the sample size was not so small or higher-order modes are used, especially when the electric or magnetic field is perpendicular to the material under test. Two methods based on perturbation, namely the iteration method and the multi-state method are proposed to reduce the impact of the mutual interference, which have been proven to be direct and effective through theoretical analysis and experiments. Finally, several rod-shaped specimens processed from several standard dielectric materials (PTFE, fused silica, Al 2 O 3 ) and synthesized magneto-electric materials were measured in a fabricated cavity with a vector network analyzer. Experimental results show that the results obtained by the modified formula are more accurate than those obtained by the original formula, and are in good agreement with the data measured by other methods.INDEX TERMS Magneto-electric materials, complex permittivity and permeability, iteration, multi-state, mutual interference, perturbation.

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Section: Introductionmentioning

confidence: 99%

An Improved Cavity-Perturbation Approach for Simultaneously Measuring the Permittivity and Permeability of Magneto-Dielectric Materials in Sub-6G

Zhang

et al. 2021

IEEE Access

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“…The planar resonant sensor based on the surface integrated waveguide (SIW) technology appears to be a viable option, which has been explored by few research groups [1], [2], [6]. The main problem associated with such a type of sensors is the low intensity and sinusoidal varying electric field, which is getting perturbed by the finite volume of the sample [14]- [17].…”

Section: Introductionmentioning

confidence: 99%

Design of Multilayered Epsilon-Near-Zero Microwave Planar Sensor for Testing of Dispersive Materials

Jha

Akhtar

2015

IEEE Trans. Microwave Theory Techn.

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A novel planar multilayered epsilon-near-zero (ENZ) tunnel sensor based on fully laminated surface integrated waveguide (SIW) technology is proposed for the microwave measurement of dispersive materials. The proposed sensor is designed and optimized using parametric analysis to obtain the multilayered ENZ tunnel dimensions. It is observed that the width of the upper tunnel of the designed two-tunnel sensor should be at least half of the SIW width of the actual SIW structure for the multiband operation. The complex permittivity measurement using the proposed sensor is possible at two frequencies with a single set of measurement data. The proposed method is based on perturbation of the squeezed electric field having constant magnitude and high intensity inside the multilayered ENZ tunnel, which eventually increases the sensitivity of the proposed sensor. The sensitivity and accuracy of the proposed sensor are tested using both the simulated and the experimented data. It is found that the proposed sensor is highly sensitive, and typically demonstrates 6% error under ideal conditions, thus making it a good candidate for the microwave measurement of dispersive materials.Index Terms-Cavity perturbation methods, dispersive materials, epsilon-near-zero (ENZ), microwave sensors, permittivity measurement, substrate integrated waveguide (SIW). 0018-9480

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Construction, mechanism and prospective of conductive polymer composites with multiple interfaces for electromagnetic interference shielding: A review

Wang

Tang

Cai

et al. 2021

Carbon

488

182

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Improved Resonator Method for Microwave Testing of Magnetic Composite Sheets

Cited by 17 publications

References 33 publications

An Improved Cavity-Perturbation Approach for Simultaneously Measuring the Permittivity and Permeability of Magneto-Dielectric Materials in Sub-6G

An Improved Cavity-Perturbation Approach for Simultaneously Measuring the Permittivity and Permeability of Magneto-Dielectric Materials in Sub-6G

Design of Multilayered Epsilon-Near-Zero Microwave Planar Sensor for Testing of Dispersive Materials

Construction, mechanism and prospective of conductive polymer composites with multiple interfaces for electromagnetic interference shielding: A review

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