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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

Bandwidth and quality factor of a small antenna with coupled impedance resonances   (Citations: 1)
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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.
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    • ...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

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