A computer model investigation of a quad log-periodic array

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Author
Christidis, Cosmas
Date
1988Advisor
Adler, Richard W.
Second Reader
Breakall, James K.
Metadata
Show full item recordAbstract
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.
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