A computer model investigation of a quad log-periodic array
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Authors
Christidis, Cosmas
Subjects
Quad Antenna
Quad Log-Periodic Arrays
Quad Uniformly Periodic Arrays
Quad Log-Periodic Arrays
Quad Uniformly Periodic Arrays
Advisors
Adler, Richard W.
Date of Issue
1988
Date
December 1988
Publisher
Monterey, California. Naval Postgraduate School
Language
en_US
Abstract
This thesis investigates the possibility of developing a quad log-periodic array for use in military applications over a wide range of frequencies. The investigation of a uniformly periodic quad array was conducted utilizing the Numerical Electromagnetics Code (NEC). A numerical-experimental study of near field characteristics and far field radiation patterns for selected versions of the structure helped to identify necessary performance characteristics of a successful log-periodic version of the antenna. The near field investigation provided k versus /? information for a Brillouin diagram (/? was determined from the relative amplitude and phase of the near magnetic field created by the structure under various conditions). Far field radiation patterns provided a check on the results of the Brillouin diagram and identified the presence of end or truncation effects. The results of this study show the potential exists for designing a successful quad log-periodic antenna. Using NEC, a selected model was run in free space to obtain radiation patterns and element currents on the array. The NEC results indicate that a quad log-periodic array with a switched transmission line has desirable log-periodic characteristics and shows promise for military and commercial applications.
Type
Thesis
Description
Series/Report No
Department
Electrical and Computer Engineering (ECE)
Organization
Identifiers
NPS Report Number
Sponsors
Funder
Format
107 p.
Citation
Distribution Statement
Approved for public release; distribution is unlimited.
Rights
Copyright is reserved by the copyright owner.