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A fixed-frequency Angular Displacement sensor Based on Dielectric-Loaded Metal Strip Resonator

IEEE sensorS JOURNAL 2021年第3期21卷 2669-2675页

作者： Regalla, Premsai Kumar, A. V. Praveen Birla Inst Technol & Sci BITS Pilani Dept Elect & Elect Engn Pilani 333031 Rajasthan India

A fixed-frequency angular displacement sensor using a dielectric-loaded metal strip resonator is proposed. The dielectric body on which the strip resonator is attached is a cylinder having a high dielectric constant (epsilon(r) >> 1). The resulting resonator operates at the half-wave resonant frequency of the quasi-TEMmode of the loaded strip, which is much lower than the nominal resonant frequency of the strip. To enable angle sensing, the resonator is placed symmetrically between two 50 Omega, open-ended microstrip lines, so that the magnitude of the transmission coefficient (|S-21|) between the lines varies with the strip angle, i.e., 0(degrees) <= theta <= 90(degrees). Also, this configuration ensures constant resonant frequency operation for all angles. Simulations show that although the |S-21| versus angle curve varies exponentially in the range of 0(degrees) <= theta <= 90(degrees), the corresponding coupling coefficient varies quasi-linearly in 10(0) <= theta <= 80 degrees. A laboratory prototype for similar to 2.4 GHz resonant peak is fabricated and the simulation results are verified through prototype measurement. The advantages of the proposed sensor are that it is compact, has a simple design, and operates at a fixed frequency, enabling a low-cost, robust angular sensor.

关键词： Angular displacement sensor dielectric-loaded strip resonator microstrip line transmission coefficient coupling coefficient fixed-frequency sensor

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Sensitivity Comparison of Common Microwave Feeds to be Useful in Angular Displacement sensors

Sensitivity Comparison of Common Microwave Feeds to be Usefu...

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IEEE Microwaves, Antennas, and Propagation Conference (MAPCON)

作者： Regalla, Premsai Kumar, A. V. Praveen

ISBN: (纸本)9781665452038

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.

关键词： Angular displacement sensor microwave feeding techniques Reflection coefficient fixed-frequency sensor dielectric resonator

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Application of a Cylindrical Dielectric Resonator as an Angular Displacement sensor 17

Application of a Cylindrical Dielectric Resonator as an Angu...

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17th International Symposium on Antennas and Propagation (APSYM)

作者： Regalia, Premsai Kumar, A. V. Praveen BITs Pilani Pilani Campus Pilani Rajasthan India

ISBN: (纸本)9781665419383

Authors investigate the application of a cylindrical dielectric resonator (CDR) for detecting the angular displacement with the help of numerical simulations. The CDR is made bisymmetric by attaching a metal strip diametrically on its top-face to enable angular sensing in the range of 0 - 90 degrees. The CDR is coupled to a single microstrip line for reflection mode measurement, while it is coupled to two microstrip lines for transmission mode measurement. Identically in both the configurations, the CDR resonates at the HEM11 delta mode frequency of approximate to 3.5 GHz, with the magnitude of the respective S-parameters varying with the strip angle. The CDR configurations provide nearly identical sensitivities and quasi-linear ranges of approximate to 0.26 dB/degrees, and 70 degrees respectively for the reflection mode, while approximate to 0.3 dB/degrees and 60 degrees respectively for the transmission mode operation.

关键词： Angular displacement sensor Cylindrical dielectric resonator fixed-frequency sensor Reflection mode Transmission mode

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