Bandwidth Enhancement of Dielectric Resonator Antennas using Stacked and Fractal Geometries (Record no. 121893)
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| 000 -LEADER | |
|---|---|
| fixed length control field | ngm a22 7a 4500 |
| 008 - FIXED-LENGTH DATA ELEMENTS--GENERAL INFORMATION | |
| fixed length control field | 210604b ||||| |||| 00| 0 eng d |
| 082 ## - DEWEY DECIMAL CLASSIFICATION NUMBER | |
| Classification number | TT000086 |
| Item number | TRI |
| 100 ## - MAIN ENTRY--PERSONAL NAME | |
| Personal name | Trivedi, Kedar |
| 245 ## - TITLE STATEMENT | |
| Title | Bandwidth Enhancement of Dielectric Resonator Antennas using Stacked and Fractal Geometries |
| Statement of responsibility, etc | by Kedar Trivedi |
| 260 ## - PUBLICATION, DISTRIBUTION, ETC. (IMPRINT) | |
| Place of publication, distribution, etc | Ahmedabad |
| Name of publisher, distributor, etc | Nirma Institute of Technology |
| Date of publication, distribution, etc | 2019 |
| 300 ## - PHYSICAL DESCRIPTION | |
| Extent | 97p Ph. D. Thesis with Synopsis and CD |
| 500 ## - GENERAL NOTE | |
| General note | Guided by: Dr. Dhaval Pujara With Synopsis and CD <br/>15EXTPHDE152<br/><br/>ABSTRACT:<br/>In recent times, the Dielectric Resonator Antennas (DRAs) have shown great potential<br/>as an alternative to microstrip patch antennas in various practical applications. Their<br/>inherent properties like wide bandwidth (BW), high gain, low losses, high mechanical<br/>strength, high power handling capacity, three degrees of freedom, compatibility with<br/>diverse feeding techniques, and many more make DRAs the preferred choice over<br/>microstrip antennas.<br/>Various techniques have been employed by the researchers for bandwidth improvement<br/>of Dielectric Resonator Antennas. This thesis focusses on the concept of using fractal<br/>geometry, stacking and a hybrid of fractal geometry and stacking for achieving wide<br/>bandwidth. Various novel DRA designs with wideband and ultrawideband (UWB)<br/>performance have been proposed. The proposed antennas have been analyzed using a<br/>FEM-based EM simulator Ansys HFSS. The prototypes have been fabricated and their<br/>results compared with simulated results to validate the designs. Further, it was found<br/>that very little work had been carried out in the field of mutual coupling isolation in<br/>ultrawideband DRA array. Using novel Defected Ground Structures (DGS), reduction<br/>in mutual coupling in different DRA array designs has been achieved.<br/>In the first approach to enhance the bandwidth of DRAs, two novel fractal-based DRA<br/>designs have been proposed. The use of fractal geometry also offers the benefit of<br/>antenna miniaturisation. The first design is a Triangular Prism-shaped DRA with<br/>Sierpinski Gasket fractal geometry. An impedance bandwidth of 72.3% has been<br/>achieved in this prototype. Secondly, the design of the innovative Surya Yantra-shaped<br/>fractal UWB DRA has been proposed. Measured impedance bandwidth of 113.3%<br/>covering the frequency range from 2.6 to 9.4 GHz has been achieved.<br/>In the second approach, two novel DRA designs based on the concept of stacking have<br/>been proposed. Apart from bandwidth improvement this approach also provides the<br/>benefit of high gain. Stacked T- and Z-shaped DRA designs have been proposed.<br/>Measured impedance bandwidth of 110.5% in stacked T-shaped DRA, and 114.5% in case of stacked Z-shaped DRA has been achieved. The simulated results of both the<br/>antennas have been validated.<br/>In the third approach, two novel DRA designs using a hybrid configuration based on<br/>the combined concept of fractal geometry and stacking have been proposed. This<br/>approach helps in achieving all three benefits of wide bandwidth, high gain, and antenna<br/>miniaturisation. Stacked fractal Maltese Cross and Triangular Prism-shaped DRA<br/>designs have been proposed. UWB of 111% covering 3.6–12.6 GHz and 120.9%<br/>covering 3.3–13.4 GHz have been achieved in stacked fractal Maltese Cross- and<br/>Triangular Prism-shaped DRA designs, respectively.<br/>Finally, the aspect of mutual coupling reduction has been addressed by the use of<br/>different defected ground structures. Mutual coupling reduction is the most essential<br/>factor for the use of antennas in multiple-input multiple-output (MIMO) applications.<br/>Four DRA array designs with novel DGS structures have been proposed. In the first<br/>two designs namely, fractal Tree- and stacked fractal Maltese Cross-shaped DRA array,<br/>periodic defected ground structure (PDGS) of C-shape has been incorporated to achieve<br/>mutual coupling reduction (< -15 dB). Elliptical-shaped DGS is used to reduce mutual<br/>coupling in the Triangular Prism-shaped fractal DRA array (third design). The fourth<br/>design is a Surya Yantra-shaped fractal DRA array with rectangular loop-shaped DGS<br/>for better isolation between DR elements.<br/>In all, ten novel designs have been proposed along with their detailed study. |
| 856 ## - ELECTRONIC LOCATION AND ACCESS | |
| Uniform Resource Identifier | https://repository.nirmauni.ac.in/jspui/handle/123456789/10126 |
| Public note | Institute Repository (Campus Access) |
| 856 ## - ELECTRONIC LOCATION AND ACCESS | |
| Uniform Resource Identifier | https://shodhganga.inflibnet.ac.in/handle/10603/338031 |
| Public note | Shodhganga |
| 942 ## - ADDED ENTRY ELEMENTS (KOHA) | |
| Source of classification or shelving scheme | Dewey Decimal Classification |
| Koha item type | Thesis |
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