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Author: search.filters.author.Kumar, A. V. PraveenSubject: search.filters.subject.Dielectric resonator

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    Sensitivity Comparison of Common Microwave Feeds to be Useful in Angular Displacement Sensors
    (IEEE, 2022) Kumar, A. V. Praveen
    In this work, the authors analyze the performance of dielectric resonator (DR) based angular displacement sensor with different feeding methods. It is demonstrated that, sensor characteristics like resonant frequency, impedance matching, sensitivity, and dynamic range are highly dependent on the selected feeding technique. The common microwave feeds such as the coaxial probe, slot line, microstrip line, and conformal microstrip line are considered for reflection mode operation. Standard commercial EM simulation tool ANSYS HFSS is used for performing the simulations. Analysis of the simulation results lead to proposing the microstrip line feed for realizing fixed-frequency DR based angular sensor which is experimentally validated.
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    Application of HEM11δ Mode in DR based Linear Displacement Sensor
    (IEEE, 2023) Kumar, A. V. Praveen
    Presented a numerical investigation on the application of HEM 11δ mode in a dielectric resonator (DR) sensor. A simple two-port network is implemented by placing two microstrip lines opposite to each other for full transmission. A dielectric resonator (DR) is placed between them to detect the coupling w.r.to its displacement. Proposed transmission mode operated DR excite HEM 11δ mode at~ 3.7 GHz. Here, the DR positional movement produces identical results in both directions (+dx/ -dx) due to the structural bisymmetry. This single frequency operated Transmission circuit provides 1.78 dB/mm sensitivity in the 0 - 9 mm range.
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    A Microwave Resonator Realized Combined Displacement Sensor
    (IEEE, 2023) Kumar, A. V. Praveen
    In this work, a microwave resonator realized combined displacement sensor is presented. To realize this, a metal-strip loaded DR is coupled to a pair of 50 ohm microstrip lines. The change in |S21| helps to find out the displacement. The proposed model excites both the strip mode and DR mode based on the alignment of movable resonator to fixed microstrip lines. To verify the HFSS response, the fabricated prototype is tested with VNA. The sensor features are compared with the existing combined displacement sensors.
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    Impact of the Design Parameters on the Microwave Displacement Sensor Performance
    (IEEE, 2023) Kumar, A. V. Praveen
    The investigations have been conducted on the involved design parameters to analyze the behavior of the microwave displacement sensor output characteristics. To implement this, a dielectric resonator loaded to a reflection mode operated microstrip line circuit is proposed. For the proposed reflection mode sensor, the sensor features like resonant frequency, impedance matching position, sensitivity, and dynamic range are sensitive to the displacement of DR to microstrip line. The impact of the substrate shape and size, and resonators geometrical properties are numerically analyzed and experimentally validated by using VNA. The sensor analysis shows good matching between both HFSS simulations and VNA measurements.
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    A low-cost reflection mode operated microwave resonator sensor for angular displacement detection
    (Taylor & Francis, 2024-08) Kumar, A. V. Praveen
    A low-cost microwave resonator sensor for angular displacement detection is proposed. The sensor uses a strip-loaded dielectric resonator (SLDR) as the key element. The sensor operates in the reflection mode, i.e. by producing a variation in the reflection coefficient (S11) according to the angular position of the SLDR relative to a microstrip transmission line. The primary advantage of the proposed strategy is its fixed-frequency operation enabling the S11 measurement with a low-cost reflectometer, thereby avoiding the costly vector network analyzer (VNA). Design modelling and initial analysis of the sensor are performed with ANSYS HFSS software. To demonstrate proof of concept, a sensor prototype is fabricated and experimentally characterized with a custom-made reflectometer. Results are compared against VNA-based measurements to be in decent agreement. The proposed sensor exhibits 0.43 dB/0 sensitivity over the dynamic range of 00–900.