Abstract

Excitation of high-order modes is an essential feature for specific applications that require high gain without increasing the antenna aperture area. From this perspective, as planar antennas have limited gain, 3D antennas are the best candidate for such applications. Examples of such antennas are the quadruple-ridged flared horn, conical spiral, conical sinuous, and eleven antennas. Although all of these antenna types increase the gain by adjusting the antenna height, they require very complex manufacturing techniques at a high cost in addition to significant metallic/surface-wave losses, especially at higher frequencies. Because the dielectric resonator antenna (DRA) has no metal parts, it has become one of the most popular antennas.

In light of this, two independent projects are presented in this dissertation. The relationship between them is the use of DRAs as the core of the antenna system, as well as they are also designed for 5G applications. These projects aim to investigate the effect of using two different excitation techniques on the performance and ability of a single DRA to provide high gain, wide bandwidth, and an easy fabrication procedure at a low cost.

The first proposed technique provides highly-controlled gain, but at a lower cost (on the order of tens of dollars), as well as a rapid and much easier fabrication process as compared to the previously discussed antennas, with the potential to scale down, making it possible for the proposed antenna to work at higher frequencies without significantly greater complexity. This is due to the possibility of direct manufacturing through the use of a 3D dielectric printing technique that provides high accuracy at microwave frequencies. The second proposed design aims to eliminate the loss from the metallic parts of standard feeding techniques used to feed the DRA to enhance the antenna characteristic at higher frequencies.

Degree Date

Spring 5-14-2022

Document Type

Dissertation

Degree Name

Ph.D.

Department

ELECTRICAL ENGINEERING

Advisor

Prof. Choon Lee

Second Advisor

Prof. Jerome Butler

Third Advisor

Prof. Ping Gui

Fourth Advisor

Prof. David Willis

Fifth Advisor

Prof. Mohamed Ezzat

Subject Area

Electrical, Electronics Engineering

Number of Pages

108

Format

.pdf

Creative Commons License

Creative Commons Attribution-Noncommercial 4.0 License
This work is licensed under a Creative Commons Attribution-Noncommercial 4.0 License

Available for download on Monday, May 03, 2027

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