MUMBAI, India, July 11 -- Intellectual Property India has published a patent application (202521058887 A) filed by Bharatiya Vidya Bhavan's Sardar Patel Institute Of Technology, Maharashtra, on June 19, for 'electromagnetic band gap (ebg) resonator-based differential microwave sensor for dielectric characterization of liquids.'
Inventor(s) include Mane Tulshidas; Sonkusare Reena; Bhavarthe Pramod; and Kompella S. L. Parvathi.
The application for the patent was published on July 11, under issue no. 28/2025.
According to the abstract released by the Intellectual Property India: "An EBG-based differential microwave sensor for characterizing the dielectric properties of liquids is disclosed. The sensor consists of a pair of electromagnetic bandgap resonators patterned on a low-loss Rogers RT5880 substrate, integrated with microfluidic channels for sample delivery. One resonator is exposed to a liquid sample via a microfluidic channel, while a second, identical resonator is kept as a reference (isolated from the sample). The introduction of the liquid causes a measurable shift in the resonant frequency of the sensing resonator relative to the reference resonator. By analyzing the microwave frequency response (specifically the separation between resonant peaks and their quality factors), the dielectric constant and loss tangent of the liquid can be accurately determined. The differential configuration inherently cancels common-mode influences (such as temperature or environmental changes), yielding high stability and sensitivity. The sensor is compact and fabricated using planar PCB techniques, and its performance is validated through HFSS simulations and experimental results, demonstrating its suitability for real-time liquid permittivity measurement in industrial, biomedical, and environmental applications."
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