Power transfer efficiency formulation for reciprocal and non-reciprocal linear passive two-port systems

Ohira, Takashi

doi:10.1587/elex.15.20171196

Cited by 2 publications

(2 citation statements)

References 9 publications

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“…In addition to this assumption, practical power transfer systems usually exhibit reciprocity between the two ports as well. This is because most of the linear passive elements have this property except for specialpurpose components such as isolators and circulators [12].…”

Section: Reciprocitymentioning

confidence: 99%

Power Transfer Theory on Linear Passive Two-Port Systems

Ohira

2018

IEICE Trans. Electron.

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This paper theoretically revisits linear passive two-port systems from the viewpoint of power transfer. Instead of using the conventional S 21 magnitude, we propose generalizing the kQ product as a figure of merit for two-port performance evaluation. We explore three examples of power transfer schemes, i.e. inductive, capacitive, and resistive channels. Starting from their voltage-current equations, the kQ formula is analytically derived for each scheme. The resultant formulas look different in appearance but are all physically consistent with ωM/R, which stems from the original definition of kQ product in a primitive transformer. After comprehensively learning from the three examples, we finally extend the theory to a black-box model that represents any kind of power transfer channel. In terms of general two-port Z-parameters, useful mathematical expressions are deduced for the optimum load, input impedance, and maximum power transfer efficiency. We also supplement the theory with helpful graphics that explain how the generalized kQ behaves as a function of the circuit parameters.

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Section: Reciprocitymentioning

confidence: 99%

Power Transfer Theory on Linear Passive Two-Port Systems

Ohira

2018

IEICE Trans. Electron.

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“…The power transmitting efficiency is a key index used to evaluate an MPT system [14,15,16,17]. The BCE is an important index used to evaluate a transmitting antenna system.…”

Section: Introductionmentioning

confidence: 99%

An analytical model of transmitting arrays with excitation perturbations for microwave power transmission

Zhang

Lou

Wang

et al. 2022

IEICE Electron. Express

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An analytical model is proposed to calculate the performance on beam collecting efficiency (BCE) of transmitting arrays with excitation errors for microwave power transmission (MPT). Due to the inconsistent output of power amplifiers and the uncertainty of the joint loss of radio frequency (RF) device, the small perturbations will be brought into excitation amplitudes and phases, which will decrease the BCE. This analytical model involves the use of a Taylor series expansion to account for small perturbations in the excitation errors. The mathematical model between the statistical information of excitation perturbations and BCE is directly established. To fully prove the accuracy of the given model, numerous random samples will be used to compare the results of the proposed model and Monte Carlo simulation (MCS). Compared with the MCS, the proposed model does not require much-repeated calculation. The proposed method can be applied at the antenna design stage to effectively evaluate the effect of excitation perturbations on the BCE.

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Power transfer efficiency formulation for reciprocal and non-reciprocal linear passive two-port systems

Cited by 2 publications

References 9 publications

Power Transfer Theory on Linear Passive Two-Port Systems

Power Transfer Theory on Linear Passive Two-Port Systems

An analytical model of transmitting arrays with excitation perturbations for microwave power transmission

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