عنوان

Performance Improvement and Applications of Biomimetic Electrically Small Antenna Arrays

Number

TLpq2486111709

.Language of Text, Soundtrack etc

انگلیسی

Title Proper

Performance Improvement and Applications of Biomimetic Electrically Small Antenna Arrays

General Material Designation

[Thesis]

First Statement of Responsibility

Ranjbarnikkhah, Mohammad

Subsequent Statement of Responsibility

Behdad, Nader

Name of Publisher, Distributor, etc.

The University of Wisconsin - Madison

Date of Publication, Distribution, etc.

2019

Specific Material Designation and Extent of Item

130

Dissertation or thesis details and type of degree

Ph.D.

Body granting the degree

The University of Wisconsin - Madison

Text preceding or following the note

2019

Text of Note

Recently a class of biologically-inspired electrically-small antenna arrays have been reported. Referred to as biomimetic antenna arrays (BMAAs), these antennas mimic the hyperacute senses of directional hearing of small animals. First we present a two-element tunable biomimetic antenna array (BMAA) that uses a single varactor to achieve tunability over a relatively wide band. The ECN is designed to allow for tuning the response of the BMAA. Over this frequency range, the proposed BMAA can enhance the phase difference between the output signals compared to a conventional array while extracting the maximum available power from the incoming wave. Then, we present a three-element biomimetic antenna array (BMAA) with an electrically-small triangular lattice. The proposed array consists of three identical quarter-wavelength-long monopoles each positioned at a corner of an equilateral triangle. It will allow for resolving ambiguities problem when such BMAAs are used in small-aperture direction finding systems. The three strongly-coupled antennas are connected to an external coupling network with three inputs and three outputs. This network augments the mutual coupling between the strongly-coupled antennas and is designed to maximize the output phase difference between each two antenna elements without sacrificing the output power level of the array compared to a conventional array occupying the same aperture. Then, we present the performance of multi-input-multi-output (MIMO) communications systems that exploit biomimetic antenna arrays (BMAAs) with electrically-small aperture dimensions. By exploiting the mutual coupling between closely-spaced radiating elements and extracting the maximum available power from all excitation modes of the array, BMAAs can significantly outperform conventional antenna arrays with similar aperture sizes. The capacity of MIMO systems using such BMAAs are compared with those that use conventional antenna arrays with the same element types and spacing. Finally we present a design strategy for platform-based antennas operating on electrically-small platforms such as unmanned ground vehicles (UGVs). Specifically, we report the design of a platform-based antenna operating at the lower end of the VHF band for an electrically small UGV. The antenna is mounted on the bottom of the platform resulting in an extremely low profile design and generating vertically-polarized, monopole-like radiation patterns. The design of this low-profile antenna is extended to a two-element antenna array mounted on the same platform and the performance of this array as part of a two-element direction-finding system was investigated through computer simulations.

Electrical engineering

Electromagnetics

Behdad, Nader

Ranjbarnikkhah, Mohammad

Electronic name

p

[Thesis]

276903

a

Y