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Keywords
(4)
Electrically Small Antenna
Quality Factor
Resonant Frequency
Lower Bound
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Bandwidth and quality factor of a small antenna with coupled impedance resonances
Bandwidth and quality factor of a small antenna with coupled impedance resonances,10.1109/CCECE.2011.6030464,O. B. Vorobyev
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Bandwidth and quality factor of a small antenna with coupled impedance resonances
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Citations: 1
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O. B. Vorobyev
interrelation of the quality factor, the
lower bound
on the
quality factor
�� �� (� )� , and bandwidth was examined for an
electrically small antenna
with coupled impedance resonances around its antiresonance. Bands corresponding to the resonances and the total bandwidth of the antenna are limited by values of � �� (� ) calculated at frequencies of their centers. The approximate
quality factor
determined from the frequency derivative of impedance of the antenna at the antiresonant frequency �� (� � )� is less than � �� (� � ). The approximate quality factors at the maximums of the bands are utilized to define the composite
quality factor
of the antenna with coupled resonances− � � (� � ), which complies with the
lower bound
on the quality factor.
Conference:
Canadian Conference on Electrical and Computer Engineering  CCECE
, pp. 000321000324, 2011
DOI:
10.1109/CCECE.2011.6030464
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Citation Context
(1)
...In the range is not the additive quantity that hinders the correct estimation of of antennas with coupled resonances in the part of the antiresonant range [
6
]...
...Because the resistance of antennas in resonantrangesismuchlessthantheirresistanceinantiresonant ranges [1]–[
6
], an equivalent circuit of an untuned electrically small antenna in Fig. 1 is comprised of a parallel subcircuit in series with a serial subcircuit...
...Negative permittivity allows for the advantageous employment of the axisymmetric field of an antenna [2], [4], [
6
] to simplify the interpretation of the obtained results...
...Insertion of an additional shell layer with a capacitive reactance of free space, shown in Fig. 2 as layer I, allows the tuning of the antenna to an additional resonance for permittivity magnitudes higher than the antiresonant permittivity magnitude of the shell [
6
]...
...It is noteworthy that the location of frequencies of maximal conductance and resonances in the range of the antenna is a necessary but not sufficient condition to ensure that those frequencies are in a similar range for the antiresonant subcircuit of the antenna . Satisfaction of the latter condition is provided by the fulfillment of the inequality [
6
].Relations(2)and(7)areequivalent only under the stated condition...
...The total bandwidth of the antenna consisting of two bands is centered at in Fig. 5. Using (10), one finds the composite quality factor of the antenna with coupled resonances [
6
]...
Oleg B. Vorobyev
.
Quality Factor of an Antenna With Closely Spaced Resonances
References
(8)
Impedance, bandwidth, and Q of antennas
(
Citations: 162
)
Arthur D. Yaghjian
,
Steven R. Best
Journal:
IEEE Transactions on Antennas and Propagation  IEEE TRANS ANTENNAS PROPAGAT
, vol. 53, no. 4, pp. 12981324, 2005
Limitations in Relating Quality Factor to Bandwidth in a Double Resonance Small Antenna
(
Citations: 19
)
Howard R. Stuart
,
Steven R. Best
,
Arthur D. Yaghjian
Journal:
IEEE Antennas and Wireless Propagation Letters  IEEE ANTENN WIREL PROPAG LETT
, vol. 6, no. 11, pp. 460463, 2007
BANDWIDTH, Q FACTOR, AND RESONANCE MODELS OF ANTENNAS
(
Citations: 25
)
Mats Gustafsson
,
Sven Nordebo
Journal:
Progress in Electromagnetics Researchpier  PROG ELECTROMAGN RES
, vol. PIER 62, pp. 120, 2006
A reexamination of the fundamental limits on the radiation Q of electrically small antennas
(
Citations: 269
)
James S. McLean
Journal:
IEEE Transactions on Antennas and Propagation  IEEE TRANS ANTENNAS PROPAGAT
, vol. 44, no. 5, 1996
On the quality factor of strip and line source antennas and its relationship to superdirectivity ratio
(
Citations: 5
)
DONALD R. RHODES
Journal:
IEEE Transactions on Antennas and Propagation  IEEE TRANS ANTENNAS PROPAGAT
, vol. 20, no. 3, pp. 318325, 1972
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Citations
(1)
Quality Factor of an Antenna With Closely Spaced Resonances
Oleg B. Vorobyev
Journal:
IEEE Antennas and Wireless Propagation Letters  IEEE ANTENN WIREL PROPAG LETT
, vol. 10, pp. 12161219, 2011