Abstract

This paper presents a new sensing method based on passive generalized Parity-Time (GPT)-symmetry with enhanced sensitivity compared with the traditional method in the microwave frequency range. GPT-symmetry circuit that is the basis of the sensing method is derived, facilitating the establishment of a sensor. The perturbation of equivalent lumped elements including R, L and C to reflection coefficients of the circuit is investigated, showing better sensitivity of the resonant frequency shift, and in particular, reflection magnitude change to the perturbation than the conventional method. In addition, the operating frequency in this method can be tuned by the coupling coefficient. An experiment of noncontact measuring concentrations of glucose water is implemented to verify the method, showing the sensitivity in terms of the resonant frequency and reflection magnitude change is 12 MHz/[g/dl] and 20 dB/[g/dl] respectively which have a good consistency with the simulation. Noteworthily, weak coupling needed in this sensor indicates that we can easily carry out long-distance noncontact measurement with the high sensitivity.

Talk to us

Join us for a 30 min session where you can share your feedback and ask us any queries you have

Schedule a call

Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.