Field of a Rectangular Loop

Levin, B. M.

doi:10.1109/tap.2004.825617

Cited by 8 publications

(5 citation statements)

References 5 publications

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“…The near-field of a circular loop is studied in a limited number of papers. Research focusing on the near-field of a square loop is even more limited, with the exception of a paper written by Levin [33]. Based on the closed turns approximation the square spiral can be represented by a collection of concentric square loops where each loop is partitioned into four linear dipole elements, with lengths and for the TX and RX coils respectively.…”

Section: A Notation Coil Geometries and Coil Modelingmentioning

confidence: 99%

“…4 the efficiency of two laterally displaced coupled solenoids is computed by equation (17) For circular spiral coils, laterally misaligned, the same principle applies. The component of the magnetic field strength denoted is computed by (32) in Appendix B and the power transfer function for this geometry is now given by (18) In this case, in (18) represents the modulus of the elliptic integral and is given by (33).…”

Section: B Power Transfer Expressionsmentioning

confidence: 99%

“…Hence, it is more appropriate to define as follows: (33) where is the radius of each concentric loop.…”

Section: Appendix a Magnetic Field Of Circular Geometrymentioning

confidence: 99%

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Wireless Power Transfer in Loosely Coupled Links: Coil Misalignment Model

2011

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A novel analytical model of inductively coupled wireless power transfer is presented. For the first time, the effects of coil misalignment and geometry are addressed in a single mathematical expression. In the applications envisaged, such as radio frequency identification (RFID) and biomedical implants, the receiving coil is normally significantly smaller than the transmitting coil. Formulas are derived for the magnetic field at the receiving coil when it is laterally and angularly misaligned from the transmitting coil. Incorporating this magnetic field solution with an equivalent circuit for the inductive link allows us to introduce a power transfer formula that combines coil characteristics and misalignment factors. The coil geometries considered are spiral and short solenoid structures which are currently popular in the RFID and biomedical domains. The novel analytical power transfer efficiency expressions introduced in this study allow the optimization of coil geometry for maximum power transfer and misalignment tolerance. The experimental results show close correlation with the theoretical predictions. This analytic technique can be widely applied to inductive wireless power transfer links without the limitations imposed by numerical methods.Index Terms-Inductive link, misalignment analysis, RF coils, RFID, wireless power transfer.

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Section: A Notation Coil Geometries and Coil Modelingmentioning

confidence: 99%

Section: B Power Transfer Expressionsmentioning

confidence: 99%

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Wireless Power Transfer in Loosely Coupled Links: Coil Misalignment Model

2011

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“…The problem of near and far electromagnetic fields radiated from an isolated rectangular [4] or circular loop antenna is investigated using various analytical techniques for loops with uniform [5], and arbitrary [6] current distributions. Recently a technique that is based on spherical Bessel functions and Legendre polynomials expansion for the free space Green's function is introduced to obtain the fields of the circular loop antenna [7].…”

Section: Introductionmentioning

confidence: 99%

New fields expressions of a traveling wave circular loop antenna

Hamed

Bashir

2013

2013 International Conference on Computing, Electrical and Electronic Engineering (Icceee)

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A technique that is based on spherical wave functions expansion for the free space Green's function is used to derive exact near and far electromagnetic fields expressions for traveling wave circular loop antennas (TW-CLAs) with arbitrary phase change. These expressions describe separately electromagnetic fields inside and outside a sphere that generated when the loop revolves about its diameter. This makes the investigation of fields in the near region and inside the loop antenna simpler. Furthermore, a simplified expressions for the magnetic fields along the axis of the antenna and the known far-fields expressions for TW-CLA are obtained as special cases of the general field expressions presented in this paper.

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“…Square-and rectangular-loop antennas are usually used as linearly polarised antennas [1][2][3][4][5]. In recent years, it has been found that a square-or rectangular-loop antenna can also radiate a circularly polarised (CP) wave if a gap is introduced on the loop [6,7].…”

Section: Introductionmentioning

confidence: 99%

Development of wideband circularly polarised square- and rectangular-loop antennas

Basat

Traille

et al. 2006

IEE Proc., Microw. Antennas Propag.

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New types of wideband circularly polarised (CP) square-and rectangular-loop antennas are developed and discussed. It is shown that the bandwidth for circular polarisation of a loop antenna can be significantly increased by adding a parasitic loop inside the original loop. The addition of the parasitic element can create one more minimum axial ratio (AR) point, which can appropriately combine with the original one, leading to a significant enhancement for the AR bandwidth. It is found that the AR ( r 2 dB) bandwidth of a square-loop antenna can be increased from 6.5% to 20% by adding a parasitic square loop. By replacing the square loop with a rectangular loop, the AR bandwidth can be further enhanced. For a rectangular loop with an aspect ratio of 1/2, a bandwidth of nearly 50% for AR r 2dB is obtained with a gain of 8.5-7.5 dBi. A broadband balun is introduced for impedance matching.

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Field of a Rectangular Loop

Cited by 8 publications

References 5 publications

Wireless Power Transfer in Loosely Coupled Links: Coil Misalignment Model

Wireless Power Transfer in Loosely Coupled Links: Coil Misalignment Model

New fields expressions of a traveling wave circular loop antenna

Development of wideband circularly polarised square- and rectangular-loop antennas

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