A New Derivation of the Upper Bounds for the Ratio of Gain to Q

Geyi, Wen

doi:10.1109/tap.2012.2196955

Cited by 11 publications

(2 citation statements)

References 6 publications

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“…where () rad P  is the radiated power in the frequency domain, which is independent of  . Substituting (19) into (17) (20) Note that the term in the square bracket on the right-hand side gives the total stored energy at 0 (21) Substituting (18) into (21), we obtain (22) It follows from (21) and (22) that…”

Section: New Expressions For Stored Energiesmentioning

confidence: 99%

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Stored Energies and Radiation Q

Geyi

2015

IEEE Trans. Antennas Propagat.

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This paper discusses the methods for evaluating the stored electromagnetic energies and the radiation Q for an arbitrary lossless antenna. New expressions for the stored electromagnetic energies are derived by using the Poynting theorem in the complex frequency domain, and they are compared with previous theory and are validated by numerical examples. The minimization of radiation Q is also investigated. There exists an optimal current distribution that minimizes the radiation Q for specified antenna geometry. The optimized Q and the optimal current distribution may be determined by solving a generalized eigenvalue equation obtained from the Rayleigh quotient for the radiation Q. Index Terms-Antenna theory, antenna Q, stored energy2          J r J r r r rr (6) T Region3 Antenna (scatterer) J imp J Feeding line Input terminal Impressed source Region1 Region2     J J J r J r J r J r J r J r J r J r

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Section: New Expressions For Stored Energiesmentioning

confidence: 99%

“…HE antenna (or radiation) Q has been a research topic for many years [1]- [21]. According to the IEEE Standard Definitions of Terms for Antennas, the quality factor of a resonant antenna is defined as the ratio of 2 times energy stored in the fields excited by the antenna to the energy radiated and dissipated per cycle: () .…”

Section: Introductionmentioning

confidence: 99%