A low cost, printed microwave based level sensor with integrated oscillator readout circuitry
Type
Conference PaperKAUST Department
Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) DivisionElectrical Engineering Program
Integrated Microwave Packaging Antennas and Circuits Technology (IMPACT) Lab
Date
2017-10-24Online Publication Date
2017-10-24Print Publication Date
2017-06Permanent link to this record
http://hdl.handle.net/10754/626054
Metadata
Show full item recordAbstract
This paper presents an extremely low cost, tube conformable, printed T-resonator based microwave level sensor, whose resonance frequency shifts by changing the level of fluids inside the tube. Printed T-resonator forms the frequency selective element of the tunable oscillator. Unlike typical band-pass resonators, T-resonator has a band-notch characteristics because of which it has been integrated with an unstable amplifying unit having negative resistance in the desired frequency range. Magnitude and phase of input reflection coefficient of the transistor has been optimized over the desired frequency range. Phase flattening technique has been introduced to maximize the frequency shift of the oscillator. With the help of this technique, we were able to enhance the percentage tuning of the oscillator manifolds which resulted into a level sensor with higher sensitivity. The interface level of fluids (oil and water in our case) causes a relative change in oscillation frequency by more than 50% compared to maximum frequency shift of 8% reported earlier with dielectric tunable oscillators.Citation
Karimi MA, Arsalan M, Shamim A (2017) A low cost, printed microwave based level sensor with integrated oscillator readout circuitry. 2017 IEEE MTT-S International Microwave Symposium (IMS). Available: http://dx.doi.org/10.1109/MWSYM.2017.8058980.Additional Links
http://ieeexplore.ieee.org/document/8058980/ae974a485f413a2113503eed53cd6c53
10.1109/MWSYM.2017.8058980