Papers by Masoud Baghelani
IEEE transactions on microwave theory and techniques, 2024
Research Square (Research Square), Jun 12, 2023
The accurate assessment of dehydration is crucial in many diverse clinical applications. Currentl... more The accurate assessment of dehydration is crucial in many diverse clinical applications. Currently used methods for assessing dehydration rely on either skin pinch tests or analysis of urine. Therefore, therefore is a need for wearable non-invasive devices for continuous dehydration monitoring. This paper presents a novel sensor design for the monitoring of dehydration levels by the use of chipless microwave resonators. The sensor design incorporates a metallic layer beyond the tag sensor itself, resulting in an isolation of the dehydration sensing system from con icting ambient signals that provides a targeted sensing system to the tissue itself with reduced interference. The sensitivity of the sensor is high, with ã 100 KHz shift for a 1% change in dehydration).
ACS Applied Electronic Materials
IEEE Microwave and Wireless Components Letters
Semiconductor Science and Technology, 2019
2020 IEEE SENSORS
In this paper, a novel high-resolution non-contact real-time method for glycerol concentration me... more In this paper, a novel high-resolution non-contact real-time method for glycerol concentration measurement has been proposed. Glycerol concentration is an important biomarker for many diagnostic applications, such as indication of hyperglyceridemia. The proposed sensing platform is based on a loss-compensated chipless tag that is coupled to the reader resonator and active feedback loop. The reader is designed at 2.6 GHz coupled to an active microwave amplifier to compensate and the tag is designed at 1.6 GHz which is located at 2.5 mm vertical distance from the reader. The high level of sensitivity of the highresolution tag resonance makes it suitable for low concentration and small variation chemical sensing. The proposed disposable sensor demonstrates a frequency shift of 36.4 kHz when the concentration of glycerol in deionized (DI) water changes from 122 mg.lit–1 to 0 mg.lit–1 which highlights the capability of glycerol concentration sensing in the human body range.
IEEE Transactions on Biomedical Engineering, 2022
IEEE Sensors Journal, 2022
In this work, a novel method for non-invasive, label-free, multi-variable volumetric concentratio... more In this work, a novel method for non-invasive, label-free, multi-variable volumetric concentration analysis of mixtures is presented based on wide-band microwave resonators. The proposed microwave structure is a resonator with multiple splits for improving the overall sensitivity. The wide-band analysis of the sensor’s spectrum provides many resonances which shift in any of them could be translated to the dielectric permittivity at that frequency. Therefore, by considering frequency shifts in as many as 30 resonance frequencies over a high-frequency span from 100 MHz to 6.5 GHz, the sensor provides invaluable information of the mixture components. This is because of the non-linear and unique variations of the dielectric permittivity of different materials resulting in a unique frequency-dependent shift in the resonance frequencies. Seven liquids soluble in each other are mixed with different percentages with a fixed overall mixture volume in this work. According to the extreme complexity of the problem, an artificial neural network is employed with the shifts in the mentioned resonance frequencies due to introducing each sample to the sensor are considered as the input features and the volumetric concentration of each of the seven components are calculated as the outputs. The network is trained with 750 samples and tested with the different 150 other samples with the overall average MSE of as small as 0.057%.
2019 IEEE SENSORS, 2019
Moisture measurement is a key feature of future self-diagnostic smart home technology especially ... more Moisture measurement is a key feature of future self-diagnostic smart home technology especially for wooden buildings. Having zero power consumption of the sensing part and capability of distant measurement empowers the presented chipless microwave split ring resonator moisture sensor making it an ideal option for the internet of things (IoT). The introduce sensor comprises of a flexible tag mounted inside the walls, as the sensing part, and a defected ground gap coupled transmission line as the reader. The chipless sensor is a metallic trace could be embedded in as many locations inside the house as required without any additional costs. Various simulation and experimental results throughout the paper verify the effectiveness of the proposed sensor for smart home applications and the sensor demonstrates the sensitivity of 6.5 MHz/W% around the resonance frequency of 800 MHz.
2010 18th Iranian Conference on Electrical Engineering, 2010
ABSTRACT A new high reliable microelectromechanical radial contour mode disk resonator is demonst... more ABSTRACT A new high reliable microelectromechanical radial contour mode disk resonator is demonstrated with the ability to work at UHF range and high quality factor in both vacuum and air. The hollow disk structure of resonator with a ring shape anchor makes it capable to work at higher frequencies without downscaling. The ring shape anchor, which is placed at the stress free nodal zone of resonator at the desired resonance mode, causes significantly low insertion loss and therefore high quality factor. Such an anchor seems to be more reliable than stem shape anchor reported at previous papers. The motional resistance of the resonator is decreased due to displacement of the electrodes in both inside and outside of the structure. In addition to providing simulation results, this paper formulates the resonance frequency and calculates the optimum location of the anchor. Transfer function, resonance frequency and anchor displacement versus inner radius are studied.
2009 European Conference on Circuit Theory and Design, 2009
ABSTRACT A new more reliable design of micromechanical radial contour mode disk resonator have be... more ABSTRACT A new more reliable design of micromechanical radial contour mode disk resonator have been demonstrated with the ability to work at UHF range and high quality factor in both vacuum and air and spurious modes free. In addition, this structure is capable to work at higher modes (e.g. second mode) without increasing the insertion loss and therefore lowering Q. These characteristics are achieved because of the ring shape anchor which placed at the nodal ring of resonator at the second mode. Also the ring shape anchor seems to be more reliable than stem shape anchor reported at previous papers. The motional resistance of the resonator is decrease due to displacement of the electrodes in both inside and outside of the structure. In addition to providing simulation results, this paper study the spurious modes heavily and optimize the inner radius to far spurious modes from fundamental mode without increasing the insertion loss. Transfer function and resonance frequency versus inner radius are also studied.
2010 6th Iranian Conference on Machine Vision and Image Processing, 2010
Human fingerprints contain ridges and valleys which to gather forms distinctive patterns. These d... more Human fingerprints contain ridges and valleys which to gather forms distinctive patterns. These details are called minutiae, which permanent throughout whole lifetime, and then can be used as identification marks for fingerprint verification. Fingerprint image may have a poor quality that couldn't use directly for recognition processes and then must be pre- processed first. This paper proposes a novel mapping
Microsystem Technologies, 2012
ABSTRACT This paper presents an analytical evaluation of the previously demonstrated Ring Shape A... more ABSTRACT This paper presents an analytical evaluation of the previously demonstrated Ring Shape Anchored Contour Mode Disk (RSACMD) resonator and extracts its equivalent electrical circuit. In the next step, a series resonant Pierce oscillator is designed and parameterized based on the calculated MEMS characteristics. Due to the inherent 180° of phase shift in the RSACMD resonator equivalent circuit, a modified version of a Pierce sustaining circuit is introduced with two inverters (instead of one inverter in conventional Pierce oscillators) to compensate that extra phase shift and satisfy Barkhausen criteria. The designed circuit presents excellent phase noise performance because of a special design which results in small frequency pulling and enable the circuit oscillate close to natural frequency of the high Q resonator. The overall circuit consumes less than 257 μW from a 1.8 V power supply.
Microsystem Technologies, 2010
ABSTRACT A new high reliable microelectromechanical radial contour mode disk resonator is demonst... more ABSTRACT A new high reliable microelectromechanical radial contour mode disk resonator is demonstrated with the ability to work at UHF range and high quality factor in both vacuum and air. This structure is capable to work at second radial mode without increasing the insertion loss and therefore lowering Q. These characteristics are achieved because of the ring shape anchor which is placed at the nodal ring of a hollow disk resonator at the equivalent second radial mode. Also the ring shape anchor seems to be more reliable than stem shape anchors reported in previous works. The motional resistance of the resonator is decreased due to displacement of electrodes, both inside and outside of the structure. In addition to providing simulation results, this paper formulates the resonance frequency and calculates the optimum location of the anchor. Transfer function, resonance frequency and anchor displacement versus inner radius are also studied.
Microsystem Technologies, 2012
The design of RF MEMS filters is a very important research area in the RF MEMS resonator field es... more The design of RF MEMS filters is a very important research area in the RF MEMS resonator field especially for UHF frequencies. Having very high Q and compatibility with the state-of-the-art CMOS technology, RF MEMS resonators could construct channel select filters in RF transceivers front-end and surmount the need for IF stages by direct conversion. But, there is a problem for coupling of high stiff contour mode disk resonators, because there is no nodal region at the perimeter of this kind of resonators for establishing the low velocity coupling without applying asymmetry on the resonance performance of the resonators. This paper introduces a pioneering technique for low velocity coupling of these resonators without any asymmetry. Analytical design approach and FEM analysis are provided in this paper and our discussions are verified by various simulations. The resulting filter could be designed to obtain 0.004 % of bandwidth with reasonable sizes which is completely enough for channel selection in low GSM standard.
Microelectronics Journal, 2013
This paper presents a MEMS based oscillator with automatic amplitude control. Previously demonstr... more This paper presents a MEMS based oscillator with automatic amplitude control. Previously demonstrated ring shape anchored contour mode disk resonator is evaluated and some of its analytical aspects are extracted as well as its equivalent electrical circuit for further transistor level simulations. Due to 1801 phase change of the resonator, the sustaining amplifier should provide another 1801 phase for oscillation build up. As will be shown, the motional resistance of the resonator, which determines the minimum required gain of the circuit, is very high and conventional techniques could not provide such a gain in UHF frequencies. This paper proposes a trans-impedance amplifier satisfying mentioned conditions just at the required frequency. In this case, traditional Automatic Amplitude Control (AAC) method could not be applied and therefore this paper presents a novel AAC circuitry and technique. The overall circuit including bias circuitry consumes 1128 mW from 1.8 V power supply implemented in 0.18 mm standard CMOS technology.
Microsystem Technologies, 2011
Abstract One of the most encumbering issues in RF MEMS resonators is spurious modes. The problem ... more Abstract One of the most encumbering issues in RF MEMS resonators is spurious modes. The problem of spurious modes becomes more critical, when the ring type resonators are used. In the ring shape anchored contour mode disk resonator, for achieving a low serial ...
This paper presents a novel capacitive micromachined MEMS acceleration sensor with normal-to-plan... more This paper presents a novel capacitive micromachined MEMS acceleration sensor with normal-to-plane shock immunity. The paper takes advantage of suspended cantilevers over the springs of the structure which shorten the spring length for normal movements of the proof mass after a specific distance. Therefore, this makes the springs very much stronger which subsequently prevent more normal movements and catastrophic failures. Also, as the one of the most important parameters of the on-chip devices, which determines the fabrication costs of the devices, consumed area is optimized in this work by genetic algorithm. Modal and several structural analyses are provided in this paper which result very good characteristics for the proposed sensor.
Microsystem Technologies
Unfortunately, the affiliation details of the authors have been published incorrectly. The correc... more Unfortunately, the affiliation details of the authors have been published incorrectly. The correct details are given below.
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Papers by Masoud Baghelani