ADVANCED COMPACT, LOW PROFILE ANTENNA DESIGNS FOR MODERN COMMUNICATION SYSTEMS
Open Access
- Author:
- Yue, Taiwei
- Graduate Program:
- Electrical Engineering
- Degree:
- Doctor of Philosophy
- Document Type:
- Dissertation
- Date of Defense:
- June 07, 2018
- Committee Members:
- Douglas Henry Werner, Dissertation Advisor/Co-Advisor
Douglas Henry Werner, Committee Chair/Co-Chair
Ram Mohan Narayanan, Committee Member
Pingjuan Li Werner, Committee Member
Ramakrishnan Rajagopalan, Outside Member - Keywords:
- Antenna
Metasurface - Abstract:
- In this dissertation, the design, analysis, and demonstration of multiple advanced compact and low-profile antennas with enhanced functionalities are presented with operational frequency bands ranging from microwave frequencies to the terahertz regime. Basic background knowledge is reviewed first in Chapter 1. In Chapter 2, three single-band antennas with compact sizes operating in the 4.0 GHz band are proposed. Specifically, the first two designs are linearly-polarized (LP) antennas with fractional bandwidths of more than 10% and unidirectional radiation patterns. The third design in Chapter 2 is a circularly-polarized (CP) antenna with an operational bandwidth exceeding 9% and a unidirectional radiation pattern. In Chapter 3, the design methodology of a dual-band antenna is introduced. The proposed LP antenna functions at both the 1.9 and 2.5 GHz frequency bands with unidirectional radiating characteristics. An ultra-compact footprint is achieved by the proposed antenna by virtue of rectangular complementary split ring resonator (CSRR) loadings, which also contributes to the dual-band functionality. In Chapter 4, a dual-band dual-sense CP antenna that operates at 1.9 and 2.5 GHz is proposed. The bi-anisotropic characteristic of the circular CSRR resonators is utilized in antenna engineering for the first time to realize the dual-band dual-sense CP radiation at broadside. Moreover, the size of the antenna is smaller than most of its counterparts reported in the literature. In Chapter 5, a highly miniaturized wideband wearable antenna with filtering characteristics is proposed for the 2.4 GHz industry, scientific, and medical (ISM) band based on the substrate-integrated-waveguide (SIW) technology. More importantly, the SIW structure is based on Eutectic Gallium-Indium (EGaIn) liquid metal and a flexible Styrene Ethylene Butylene Styrene (SEBS) polymer. This represents the first application of these flexible materials in antenna engineering. In Chapter 6, compact optical nanoantennas, referred to as surface plasma (SP) wave generators in this dissertation, are introduced to realize the generation of reconfigurable directional SP waves. In summary, these antennas with miniaturized volumes and advanced functionalities are promising candidates for integration into various modern communication systems.