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    A low cost, printed microwave based level sensor with integrated oscillator readout circuitry

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    Type
    Conference Paper
    Authors
    Karimi, Muhammad Akram cc
    Arsalan, Muhammad
    Shamim, Atif cc
    KAUST Department
    Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division
    Electrical Engineering Program
    Integrated Microwave Packaging Antennas and Circuits Technology (IMPACT) Lab
    Date
    2017-10-24
    Online Publication Date
    2017-10-24
    Print Publication Date
    2017-06
    Permanent link to this record
    http://hdl.handle.net/10754/626054
    
    Metadata
    Show full item record
    Abstract
    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.
    Publisher
    Institute of Electrical and Electronics Engineers (IEEE)
    Journal
    2017 IEEE MTT-S International Microwave Symposium (IMS)
    DOI
    10.1109/MWSYM.2017.8058980
    Additional Links
    http://ieeexplore.ieee.org/document/8058980/
    ae974a485f413a2113503eed53cd6c53
    10.1109/MWSYM.2017.8058980
    Scopus Count
    Collections
    Conference Papers; Integrated Microwave Packaging Antennas and Circuits Technology (IMPACT) Lab; Electrical Engineering Program; Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division

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