Faculty Advisor or Committee Member

Dr. Sergey Makarov, Advisor

Faculty Advisor or Committee Member

Dr. John Orr, Committee Member

Faculty Advisor or Committee Member

Dr. Saeed Asgari, Committee Member

Faculty Advisor or Committee Member

Dr. David Cyganski, Committee Member

Identifier

etd-042007-151741

Abstract

In this dissertation, a Method of Moments (MoM) Volume Integral Equation (VIE)-based modeling approach suitable for a patch or slot antenna on a thin finite dielectric substrate is developed and validated. Two new key features of this method are the use of proper dielectric basis functions and proper VIE conditioning, close to the metal surface, where the surface boundary condition of the zero tangential-component must be extended into adjacent tetrahedra. The extended boundary condition is the exact result for the piecewise-constant dielectric basis functions. The latter operation allows one to achieve a good accuracy with one layer of tetrahedra for a thin dielectric substrate and thereby greatly reduces computational cost. The use of low-order basis functions also implies the use of low-order integration schemes and faster filling of the impedance matrix. For some common patch/slot antennas, the VIE-based modeling approach is found to give an error of about 1% or less in the resonant frequency for one-layer tetrahedral meshes with a relatively small number of unknowns. This error is obtained by comparison with fine finite- element method (FEM) simulations, or with measurements, or with the analytical mode matching approach. Hence it is competitive with both the method of moments surface integral equation approach and with the FEM approach for the printed antennas on thin dielectric substrates. Along with the MoM development, the dissertation also presents the models and design procedures for a number of practical antenna configurations. They in particular include: i. a compact linearly polarized broadband planar inverted-F antenna (PIFA); ii. a circularly polarized turnstile bowtie antenna. Both the antennas are designed to operate in the low UHF band and used for indoor positioning/indoor geolocation.

Publisher

Worcester Polytechnic Institute

Degree Name

PhD

Department

Electrical & Computer Engineering

Project Type

Dissertation

Date Accepted

2007-04-20

Accessibility

Unrestricted

Subjects

patch antennas, volume integral equation (VIE), method of moments (MoM), low order basis functions, Convergence, Antennas (Electronics), Design and construction, Moments method (Statistics), Integral equations

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