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    Wyświetlanie 1-5 z 5
    Tytuł:
    Inset-FED microstrip patch antenna for glucose detection using label-free microwave sensing mechanism
    Autorzy:
    Rai, Priya
    Agarwal, Poonam
    Powiązania:
    https://bibliotekanauki.pl/articles/27311736.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    microwave sensor
    patch antenna
    glucose monitoring
    DMS
    Opis:
    In this work, a real-time label-free microwave sensing mechanism for glucose concentration monitoring using a planar biosensor configured with an inset fed microstrip patch antenna has been demonstrated. A microstrip patch antenna with the resonating frequency of 1.45 GHz has been designed and is fabricated on the Flame Retardant (FR-4) substrate. Due to the intense electromagnetic field at the edges of the patch antenna, edge length has been used as the detecting area where the sample under test (SUT) interacts with the electromagnetic field. The Poly-Dimethyl-Siloxane (PDMS) with the trench in the centre has been employed as the sample holder. Here, the SUT is the glucose dissolved in DI (de-ionized) water with the concentration range of 0.2 to 0.6 g/mL. The dielectric constant dependency on the glucose concentration has been used as the distinguishing factor which results in a shift in the S-parameter. The experimentally measured RF parameters were observed closely which showed the shift in S11 magnitude from -40 to -15 dB and resonant frequency from 1.27 to 1.3 GHz w.r.t the SUT solution of 0.2 to 0.6 g/mL with linear regression coefficient of 0.881, and 0.983 respectively.
    Źródło:
    Metrology and Measurement Systems; 2023, 30, 2; 211--222
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A 3D directive microwave antenna for biomedical imaging application
    Autorzy:
    Ullah, M. A.
    Alam, T.
    Islam, M. T.
    Powiązania:
    https://bibliotekanauki.pl/articles/200173.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    antenna
    3D antenna
    microwave sensor
    microwave imaging
    unidirectional
    antena
    antena 3D
    czujnik mikrofalowy
    obrazowanie mikrofalowe
    Opis:
    A directive three dimensional antenna, using folded radiating structure has been presented for the application of microwave imaging in clinical diagnosis. Two reflector walls have been introduced to achieve higher gain and directive radiation pattern along with the folding technique. The shorting wall technique is utilized to reduce the overall antenna size and to get resonance at a lower frequency. The proposed antenna obtained operating band at 1.67 GHz to 1.74 GHz. The dimension of the 3D radiating structure is 40£25£10.5 mm3. The antenna has an average realized gain of 5.2 dBi. Owing to the unidirectional radiation pattern, high gain and operating bandwidth within lower microwave frequency, the proposed antenna has potential to be used in microwave imaging for biomedical diagnosis. Also, the antenna has been utilized to compute an imaging phenomenon to detect abnormality in human head and result is presented. The design and simulation process are performed in the CST Microwave Studio software. The antenna is fabricated from 0.2 mm thick copper sheets. The results of the fabricated antenna are measured using PNA Network Analyzer (N5227A) and Satimo Star Lab.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2018, 66, 3; 355-360
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Monitorowanie naprężeń w elementach konstrukcyjnych za pomocą czujnika mikropaskowego
    Strain monitoring in structural elements by microstrip sensor
    Autorzy:
    Łopato, P.
    Herbko, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/107816.pdf
    Data publikacji:
    2018
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    czujnik naprężeń
    czujnik mikropaskowy
    technika mikrofalowa
    SHM
    badania nieniszczące
    strain sensor
    microstrip sensor
    microwave technique
    nondestructive testing
    Opis:
    W niniejszej pracy przedstawiono analizę numeryczną przetworników mikorpaskowych z kołowymi promiennikami do badania odkształceń materiałów i pośrednio naprężeń w nich występujących. W przypadku tego rodzaju czujników odkształcenie wyznaczane jest poprzez pomiar współczynnika odbicia S11, który reprezentuje stosunek mocy sygnału odbitego do mocy sygnału wejściowego. Pomiar dokonywany jest w dziedzinie częstotliwości. Do oceny wartości odkształcenia wykorzystywane jest przesunięcie częstotliwości rezonansowej wywołane zmianą geometrii rezonatora. Zaproponowane w pracy przetworniki mogą być alternatywą dla czujników tensometrycznych. W tym artykule zbadano czułość przetworników wykonanych na laminatach o różnej przenikalności elektrycznej.
    In this work, a numerical analysis of circular microstrip sensors to assess deformation of materials and indirectly strain is presented. In this type of sensors, the reflection coefficient S11 is measured to determine strain value. Reflection coefficient represents the ratio of the power of reflected signal to the power of input signal. The coefficient is measured in frequency domain. The shift of resonant frequency caused by deformation of resonator is used to evaluate the strain value. This kind of transducer can be alternative to a strain gauge. In this article, the sensitivity of transducers made on laminates with different permittivity was evaluated.
    Źródło:
    Badania Nieniszczące i Diagnostyka; 2018, 4; 9-11
    2451-4462
    2543-7755
    Pojawia się w:
    Badania Nieniszczące i Diagnostyka
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Developing RF Power Sensor Calibration Station in Direct Comparison Transfer System using Vector Network Analyzer
    Autorzy:
    Szatkowski, Jarosław
    Powiązania:
    https://bibliotekanauki.pl/articles/1839334.pdf
    Data publikacji:
    2021
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    direct comparison transfer
    microwave power measurement
    power sensor calibration
    measurement uncertainty
    VNA
    Opis:
    Calibration of RF power sensors is crucial issue in RF power measurements. Many calibration laboratories use the direct comparison transfer system with a signal generator and a power splitter. Increasing performance of modern vector network analyzers makes it possible to perform a power sensor calibration with acceptable uncertainties. The main advantage when using a VNA is a simple measurement setup with a wide frequency range (up to 50 GHz, limited only by the VNA and the standard power sensor), where all of required components, i.e. signal generator, a directional coupler and a reference power indicator are built in the VNA technology. This paper reports performing a VNA-based RF power sensors calibration for 10 MHz – 18 GHz band, carried out in the Laboratory of Electric, Electronic and Optoelectronic Metrology at the National Institute of Telecommunications in Warsaw, Poland. In order to validate the proposed solution two of power sensors were calibrated at a reference laboratory. The validation consisted of two steps. At first, one of those characterized power sensors was calibrated at our laboratory in direct comparison transfer system. Finally, the results obtained from the VNA-based system were compared with the previously obtained ones.
    Źródło:
    Journal of Telecommunications and Information Technology; 2021, 3; 18-22
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Development of fiber Bragg gratings technology and their complex structures for sensing, telecommunications and microwave photonics applications
    Autorzy:
    Osuch, T.
    Gąsior, P.
    Markowski, K.
    Jędrzejewski, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/200969.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    fiber Bragg gratings
    phase-shifted FBG
    superstructured FBG
    optical fiber taper
    fiber optic sensor
    microwave photonics
    siatki z włókna Bragg
    przesunięty fazowo FGB
    nadbudowany FBG
    światłowód
    czujniki światłowodowe
    fotoniki mikrofalowe
    Opis:
    In this paper research on the development of the fiber Bragg grating (FBG) technology which has been conducted at the Institute of Electronic Systems (IES), Warsaw University of Technology (WUT) since 2004 is presented. In particular the directions in the development of advanced set-ups employing the phase mask inscription scheme are discussed and supported with the descriptions of structures designed and fabricated with the use of the laboratory stages constructed at the IES. The novelty of the presented solutions is based on the combination of numerous techniques of the external modification of the interferometric patterns (projected onto cores of photosensitive fibers to modulate their refractive index) as well as application of the modification of the internal properties of the waveguides themselves by the means of introducing strain or tapering. The development of these sophisticated set-ups resulted in the inscription of FBGs with precisely designed spectral characteristics which found application in telecommunications and sensor technology are also illustrated here. The paper is summarized with the specification of the most important achievements attained at the lab and drafting of the possible directions of further research.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2014, 62, 4; 627-633
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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