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Two different array of dipoles above infinite electric ground plane are optimized for bandwidth using particle swarm optimizer, concept of self and mutual impedances and impedance quality factor. It is found that it is the interaction of mutual radiated power that limits the bandwidth, rather than stored energies.
This contribution describes an evaluation of the quality factor QZ of the combined TE10 / TM10 mode, including the internal and the external region of the bounding sphere. The proposed method uses a potential definition of complex power, implicitly avoiding infinite entire space integration. It is shown that QZ of the combined mode is not (unlike classical Q) limited to one half of the value for the...
The functional relation between the fractional bandwidth and the quality factor of a radiating system is studied from simple first-order-like RLC-like systems to higher-order radiating systems. It is demonstrated that, considering a first-order system, only the quality factor based on differentiation of the input impedance has unique proportionality to the fractional bandwidth. In the general case...
The functional relation between the fractional bandwidth and the quality factor of a radiating system is investigated in this communication. Several widely used definitions of the quality factor are compared with two examples of RLC circuits that serve as a simplified model of a single-resonant antenna tuned to its resonance. It is demonstrated that for a first-order system, only the quality factor...
New expressions for calculating of the quality factor QZ are presented. The resulting relations link QZ, based on the frequency change of the input impedance at the input port, with expressions based solely on the current distribution on a radiator. The derivation is based on electromagnetic potentials, automatically eliminating all divergent integrals associated with electromagnetic energies in infinite...
This paper describes an analytical evaluation of the measurable quality factor QZ of a system in which the vector potential is known. The method is presented on a canonical example of the currents flowing on a spherical shell, which leads to the analytical prescription for the lower bound of QZ.
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