Title:
Correlation-Based Pattern Stability Analysis and a Figure of Merit for UWB Antennas
Author(s):
Tharaka Dissanayake, and Karu P. Esselle
Source:
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
Vol./Issue/Date:
VOL. 54, NO. 11, NOVEMBER 2006
Year:
2006
Page(s):
3184-3191
Keywords:
Antenna bandwidth, broadband, characterization,
correlation, fidelity, multiband, optimization, pattern
stability factor (PSF), radiation pattern, stability, transfer function,
ultrawideband (UWB), wideband.
Abstract:
Combining the concepts of pulse fidelity, time-domain
correlation patterns, and frequency-domain pattern stability, we
propose the concept of frequency-domain correlation patterns and
a figure of merit, called pattern stability factor (PSF), to characterize
pattern stability of wideband antennas. The frequency-domain
correlation pattern represents the relationship between radiation
in a reference direction to radiation in all other directions
of interest, over a specified bandwidth. With practical examples,
we demonstrate that this tool is very useful when selecting a single
transfer function (and a reference direction) for the antenna when
designing or optimizing an ultrawideband (UWB) system. Careful
selection of the reference direction is crucial for antennas with relatively
less stable patterns, but even antennas with relatively stable
patterns can perform poorly overall if an inappropriate reference
direction is chosen. The PSF represents the overall pattern stability
of an antenna for a specific bandwidth and a range of directions.
It is useful as a quantitative measure: a) to compare the suitability
of different antennas for a given wideband or multiband application;
b) to assess pattern stability improvement methods; and c) to
quantify the effect of packaging, etc., on stability.We also propose
the concept of PSF bandwidth and show how it can be used to identify
stable frequency bands of a given antenna within its impedance
bandwidth, and how it compares with the impedance bandwidth of
some UWB antennas.
Document:
Reference Id:
321
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