Calculation of proximity losses in multistranded conductor bunches

Murgatroyd, Paul

doi:10.1049/ip-a-2.1989.0021

Cited by 46 publications

(33 citation statements)

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“…Its value (normalized to the maximum copolar radiated power) can be found by assuming that the radiation pattern of both moments present the same shape (i.e. elemental radiators), so that it can be directly evaluated by dividing (17) by (8) …”

Section: Analysis Of the 2-sr Radiation Propertiesmentioning

confidence: 99%

“…From the previous analysis, the radiation resistance associated to the magnetic dipole moment (8) and to the electric dipole moment (17) at the operation frequency f 0 can be predicted, resulting in 1.34 Ω and 0.37 Ω, respectively. Thus, the total radiation resistance is expected to be R rad = 1.71 Ω, and the theoretical maximum cross-polar component (18) gives XPOL max = −5.6 dB.…”

Section: Analysis Validationmentioning

confidence: 99%

“…The width of the ring was increased with respect to the design presented in Section 3, in order to enhance the radiation efficiency of the 2-SR antenna. It also allows obtaining a higher value of the input resistance, in part, due to the proximity effect [17], which tends to separate the current densities between the internal and external rings, increasing the magnetic and electric radiation resistances. The simulated input impedance was found to be Z in = 5.7+j500 Ω at f 0 , which corresponds to a power reflection coefficient of |s| = -5 dB at the tag resonance frequency.…”

Section: Design Of a 2-sr-based Uhf-rfid Tagmentioning

confidence: 99%

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2-SR-based electrically small antenna for RFID applications

et al. 2016

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In this work, the 2-turns Spiral Resonator (2-SR) is proposed as an electrically small antenna for passive radio frequency identification (RFID) tags at the European UltraHigh Frequency (UHF) band. The radiation properties are studied in order to explore the viability of the 2-SR applied to tag antenna design. Based on analytical calculations, the radiation pattern is found to provide a cancellation of the radiation nulls. This results in a mitigation of the blind spots in the read range, which are present in typical UHF-RFID tags as an undesired feature. As a proof of concept, a passive tag of size 35 mm x 40 mm (λ 0 /10 x λ 0 /9) based on the 2-SR antenna is designed and fabricated. Good radiation efficiency (75%) and a quasi-isotropic radiation pattern are obtained. The experimental tag read range for different directions is in good agreement with the simulation results. The measured read range exhibits maximum and minimum values of 6.7 m and 3.5 m, respectively.

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Section: Analysis Of the 2-sr Radiation Propertiesmentioning

confidence: 99%

Section: Analysis Validationmentioning

confidence: 99%

Section: Design Of a 2-sr-based Uhf-rfid Tagmentioning

confidence: 99%

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2-SR-based electrically small antenna for RFID applications

et al. 2016

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“…As frequency increases, frequency-related effects including skin effect, proximity effect Berleze & Robert (2003); Chen et al (1993); Dwight (1945); Egiziano & Vitelli (2004); Lotfi et al (1992); Murgatroyd (1989); Ravazzani et al (2002) and self-resonance Massarini & Kazimierczuk (1997) modify both L and R, dramatically degenerating the Q factor. A formula predicting the Q factor is…”

Section: Inductor Modelingmentioning

confidence: 99%

Design and Optimization of Inductive Power Link for Biomedical Applications

Huang¹,

Zhou²,

Wu³

et al. 2011

Applied Biomedical Engineering

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“…Eddy current losses in round wires, including skin and proximity effects in transformers are discussed by Dowell [1] and many new papers [2], [3], related to some extent to Dowell's interpretation and results.…”

Section: Introductionmentioning

confidence: 99%