Comparison of Five Formulations for Evaluating Q Factors of Antennas

Xiao, Gaobiao; Hu, Yuyang; Xiang, Shang

doi:10.1109/nemo49486.2020.9343605

Cited by 7 publications

(12 citation statements)

References 7 publications

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“…(ii) In Section 3, by applying the energy separation formulation to harmonic waves, it is verified that the time domain formulation of the theory is in consistent with its frequency domain formulation, which has been discussed in [14], [15] and has been comprehensively compared with other frequency domain formulations with several examples.…”

Section: Introductionmentioning

confidence: 65%

“…The electromagnetic radiation problems have been intensively investigated for more than a hundred years. There are still no widely accepted explicit expressions for the macroscopic electromagnetic reactive energy and the radiative energy of a radiator [1]- [15]. In classical charged particle theory, the fields associated with charged particles can be divided into Coulomb fields, velocity fields and radiative fields [16], [17].…”

Section: Introductionmentioning

confidence: 99%

“…They are not for comparison with the other time domain formulations but for the purpose to show what we can do with the proposed expressions. Numerical examples for comparison among various formulations in frequency domain can be found in [14], [15], [24].…”

Section: Introductionmentioning

confidence: 99%

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A Theory for Electromagnetic Radiation and Electromagnetic Coupling

Xiao¹

2022

Preprint

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I have made some revisions according to the advices of other researchers and submitted a new version of the theory (v4). I also have added a supplementary material for the the new version, including some detailed explanations and derivations. In the proposed theory, the total electromagnetic energy of a radiator is separated into three parts: a Coulomb-velocity energy, a radiative energy, and a macroscopic Schott energy. The Coulomb-velocity energy is considered to be attached to the sources as the same in the charged particle theory. It becomes zero as soon as its sources have disappeared. The radiative energy leaves the radiator and propagates to the surrounding space. The macroscopic Schott energy continues to exist for a short time after the sources have disappeared. It is a kind of oscillating energy and is considered to be responsible for energy exchange between the reactive energy and the radiative energy, performing like the Schott energy in the charged particle theory. As the Poynting vector describes the total power flux density related to the total electromagnetic energy, it should include the contributions of the real radiative power and a pseudo power flow caused by the fluctuation of the reactive energy. The energies involved in the electromagnetic mutual coupling are interpreted in a similar way. In the theory, all energies are defined with explicit expressions in which the vector potential plays an important role. The time domain formulation and the frequency domain formulation of the theory are in consistent with each other. The theory is also verified with Hertzian dipole. Numerical examples demonstrate that the theory may provide insightful interpretation for electromagnetic radiation and mutual coupling problems.

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Section: Introductionmentioning

confidence: 65%

Section: Introductionmentioning

confidence: 99%

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A Theory for Electromagnetic Radiation and Electromagnetic Coupling

Xiao¹

2022

Preprint

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“…For comparison, the Q factor for 0.15 t s   is calculated to be 18.5, while the Q factor obtained with the frequency domain formulation described in [15] is 17.5 at 150MHz.…”

Section: B Thin Plate Yagi Antennamentioning

confidence: 99%

“…They are not for comparison with the other two time domain formulations but for the purpose to show what we can do with the proposed expressions. Numerical examples for comparison among various formulations in frequency domain can be found in [14] [15].…”

Section: Introductionmentioning

confidence: 99%

A Theory for Electromagnetic Radiation and Coupling

Xiao¹

2022

Preprint

Self Cite

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This is latest version of my theory. I have (1)revised the abstract and the Introduction section; (2) added a section for mutual coupling to show that EM radiation and EM mutual coupling are almost the same issue, including figures for mutual couplings, and detailed expressions for the mutual coupling energies; (3)added the real radiative power for the Hertzian dipole; (4) added example of a Yagi antenna; (5) added some detailed parameters for numerical implementation.

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Q Factor of a Radiator

Xiao

2024

Modern Antenna

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Comparison of Five Formulations for Evaluating Q Factors of Antennas

Cited by 7 publications

References 7 publications

A Theory for Electromagnetic Radiation and Electromagnetic Coupling

A Theory for Electromagnetic Radiation and Electromagnetic Coupling

A Theory for Electromagnetic Radiation and Coupling

Q Factor of a Radiator

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