Interdigitated Planar Microwave Sensor for Characterizing Single/Multilayers Magnetodielectric Material

• Published in: IEEE microwave and wireless components letters Vol. 32; no. 6; pp. 619 - 622
• Main Authors: Ali, Luqman, Wang, Cong, Meng, Fan-Yi, Adhikari, Kishor Kumar, Gao, Zhi-Qiang
• Format: Journal Article
• Language: English
• Published: IEEE 01.06.2022
• Subjects: Interdigital structure; Magnetic multilayers; Magnetic resonance; Magnetic separation; magnetodielectric material; microwave sensor; Permeability; Permittivity; Q-factor; Sensitivity
• ISSN: 1531-1309; 1558-1764
• DOI: 10.1109/LMWC.2022.3141129

Simultaneous characterization of permittivity and permeability of magnetodielectric materials using a single resonator-based microwave sensor is challenging due to their similar impacts on the sensor's response. This work presents an interdigital structure-based planar microwave resonator sensor featuring high-intensity electric (E)-field zones and magnetic (M)-field zones to characterize permittivity and permeability. The proposed sensor's sensing E-field and M-field zones were implemented using the interdigital fingers configured as a spur line structure and interdigital electrodes, respectively, generating a 5.9-GHz resonance frequency with a high Q-factor (1700). The resonance frequency of the designed sensor exhibited high sensitivities (324 MHz/<inline-formula> <tex-math notation="LaTeX">\Delta \varepsilon _{r} </tex-math></inline-formula> for permittivity and 825 MHz/<inline-formula> <tex-math notation="LaTeX">\Delta \mu _{r} </tex-math></inline-formula> for permeability) for characterizing single/multilayers magnetodielectric materials with excellent resolutions (0.324 for permittivity and 0.825 for permeability). The demonstrated high sensitivity and resolution results validate the performance of the interdigital structure-based microwave resonator sensor for simultaneous characterization of multilayer magnetodielectric materials.