Dissertation/Thesis Abstract

Antenna design: A crystallographical appoach
by Snow, Luke M., M.S., San Jose State University, 2011, 104; 1505746
Abstract (Summary)

The goal of this thesis was to design a switched beam antenna by applying the principles of crystallography. The main benefit of this approach is that simple design equations can be derived from crystallography and readily applied to the design of a steerable beam antenna. Before using equations from crystallography in an antenna design, the equations are first verified. One of the best known laws of crystallography, namely Bragg's Law, is verified both by software simulation, and experimentally from the radiation patterns of a prototype antenna.

One set of simulations used to verify Bragg's Law involved varying the angles of incidence while changing the plane spacing accordingly to maintain the diffraction condition. The average deviation between the software simulation and the calculated diffracted peak location was 0.8%, confirming Bragg's Law at radio frequency. A prototype antenna was designed using Bragg's Law, and the peak location was verified experimentally. The antenna was designed for use at around 6 GHz.

Having verified that principles from crystallography can be applied at radio frequencies, a switched beam antenna array was designed. The antenna had three possible directions: forward, and +/- 90 degrees relative to the incident beam. The side lobe level was 15.7 dB, and the half power beam width was 2 to 3 degrees.

Indexing (document details)
Advisor: Hamedi-Hagh, Sotoudeh
Commitee: Kwok, Raymond, Mostafavi, Masoud
School: San Jose State University
Department: Engineering
School Location: United States -- California
Source: MAI 50/04M, Masters Abstracts International
Subjects: Electrical engineering, Electromagnetics
Keywords: Bragg's law, Crystallography, Metamaterials, Photonic crystal, Switched beam antenna
Publication Number: 1505746
ISBN: 978-1-267-14569-7
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