A New Fractal-Based Design of Stacked Integrated Transformers

Stojanović, Goran; Radovanović, Milan; Radonić, Vasa

doi:10.1155/2008/134805

Cited by 11 publications

(10 citation statements)

References 14 publications

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“…To preserve compactness and satisfy the requirements for good performances, different shapes of the microstrip line have been recently used [28][29][30][31]. Since the space-filling property of a fractal offers high potentials for miniaturization of microwave circuits [28][29][30][31], the application of the fractal curves theoretically allows the design of infinite-length lines on finite substrate area. In that manner compact transmission line with improved phase response can be obtained using fractal curves.…”

Section: Techniques For Increasing the Phase Shiftmentioning

confidence: 99%

Phase-Shift Transmission Line Method for Permittivity Measurement and Its Potential in Sensor Applications

Radonić¹,

Cselyuszka²,

Crnojević‐Bengin³

et al. 2020

Electromagnetic Materials and Devices

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This chapter offers a detailed insight into a dielectric characterization of the materials based on the phase-shift measurements of the transmission signal. The chapter will provide in-depth theoretical background of the phase-shift transmission line measurement in the microstrip architecture and determination of dielectric permittivity of design under test for several measurement configurations. Potential of the phase-shift method will be demonstrated through applications in the characterization of an unknown dielectric constant in multilayered structure, realization of the soil moisture sensor, and sensor for determination of the dielectric constant of a fluid in microfluidic channel. Moreover, specific techniques for increasing the phase shift based on the electromagnetic bandgap structure, the aperture in the ground plane and the left-handed effect will be presented. In the end, the realization of simple in-field detection device for determination of permittivity based on the phase-shift measurement will be demonstrated.

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Section: Techniques For Increasing the Phase Shiftmentioning

confidence: 99%

Phase-Shift Transmission Line Method for Permittivity Measurement and Its Potential in Sensor Applications

Radonić¹,

Cselyuszka²,

Crnojević‐Bengin³

et al. 2020

Electromagnetic Materials and Devices

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“…For this model, the top and bottom layer of coil are connected in series. The equivalent inductance of the coil can be calculated by considering two equal series inductances (L Bottom =L Top = ) with a coupling coefficient between them [11]. The series resistance of double layer PSC is expressed as follows (4) Thus, the quality factor of the stacked PSC when the parasitic capacitance of the circuit is neglected is expressed as [11], [12].…”

Section: B Double Layer Variable Width Square Coilmentioning

confidence: 99%

“…However in practice, many other works [11], [12] showed that using double layer coils, an improvement of the inductance value is ensured to a certain level, but in contrast, the quality factor may not improve to that extent because of the proximity and eddy losses effects that are not considered in " (5)". To verify this aspect, double layer coil performances' will be evaluated experimentally in the next section.…”

Section: B Double Layer Variable Width Square Coilmentioning

confidence: 99%

Performance characterization of variable width square coils for inductive link wireless power transfer

Mehri

Ammari

Slama

et al. 2016

2016 18th Mediterranean Electrotechnical Conference (MELECON)

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Supplying power to electronic medical implants (EMI) by inductive coupling has always been appreciated for its biocompatibility and its ability to transmit sufficient power to the implants. Although this method was introduced a long time ago, several challenges remain. The major challenge is the sensitivity of the link to coupling and quality factor variations which are strongly dependent on the separation distance and lateral displacements between receiving and issuing coils. In this context and in order to increase the coils' quality factor and to improve the system robustness to coupling factor variations, a new variable width square coil models are proposed and compared with conventional inductive link structures. Walking through experimental validations, this paper shows that employing variable width single layer coil, the quality factor and inductance of the coils are enhanced by 3.4 % and 8.2 % respectively in comparison with standard uniform with coil. Lateral misalignment robustness investigations confirms that, compared with single layer coils, an inductive link composed of double layer square coils is 120 % and 45% less sensitive to lateral misalignments according respectively to x and y axis.Keyword: inductive link efficiency, variable width coil, double layer coil, laterals misalignments.

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“…Equation (9) is the analytical expression for mutual inductance derived from Neumann's integral (8) with parameters defined in Fig. 5 M n = μ r μ 0 4π cos θ n l n m n 1 P n dl n · dm n (8) which can be expanded to M n = μ r μ 0 4π cos θ n l n ln P n + m n + l n P n + l n − m n + m n ln P n + m n + l n P n + l n − m n . Fig.…”

Section: A Neumann Integral: the Classical Approachmentioning

confidence: 99%

“…For this reason, we implemented a simple geometrical strategy through fractalization to increase this parameter. Stojanović et al [8] investigated numerous fractal inductors for transformer, such as the Hilbert and Koch fractal, which proved effective. Fractals also show promise for novel antenna layouts, and they are even used in the metamaterials design space [9], [10].…”

Section: Introductionmentioning

confidence: 99%

Fractal Loop Inductors

Shoute

Barlage

2015

IEEE Trans. Magn.

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We report a significant fractal-scaled increase in inductance for conductive pathways oriented in a fractal loop-based layout for a suite of planar inductors, which effectively occupy the same layout space and require only a single fabrication layer. These are closely predicted using a fractal scaling model for generalized loop-based inductors elucidated in this paper. Single-layer planar fractal structures were investigated with the loop inductor serving as the base construct. Thin sub-200 nm Cr/Au metal films compatible with flexible and stretchable substrates were used. It was found that while higher fractal orders did improve the inductive performance (over nine times from zeroth to third order), it is met with increased resistance. However, when compared with its equivalent series orientation, the effective sheet resistance of the simple fractal strategy demonstrated a clear advantage of up to four times. When the inductor is normalized for thickness, a quality factor Q greater than 40 is observed for all structures. Finally, the inductance quality gain figure of merit showing the optimal geometrical approach is introduced to quantify the quality of the structure's inductance over its resistance.

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A New Fractal-Based Design of Stacked Integrated Transformers

Cited by 11 publications

References 14 publications

Phase-Shift Transmission Line Method for Permittivity Measurement and Its Potential in Sensor Applications

Phase-Shift Transmission Line Method for Permittivity Measurement and Its Potential in Sensor Applications

Performance characterization of variable width square coils for inductive link wireless power transfer

Fractal Loop Inductors

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