Coupling Coefficients of Resonators in Microwave Filter Theory

Tyurnev, V. V.

doi:10.2528/pierb10012103

Cited by 33 publications

(4 citation statements)

References 22 publications

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“…However, the total contribution of the quantum capacitance to the total capacitance of the thin films are negligible [ 43 , 44 ]; thus, it can be ignored, and consequently, the tunneling (tube-tube) resistance dominates. Therefore, only the tunneling effects appear on the EIS spectrum [ 45 ]. Under applied strain force, a shift in the Nyquist plot occurs, and by extracting the parameters at each applied force, those parameters can be derived ( Figure 8 ).…”

Section: Resultsmentioning

confidence: 99%

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Inkjet-Printed Multiwalled Carbon Nanotube Dispersion as Wireless Passive Strain Sensor

Benchirouf,

Kanoun

2024

Sensors

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In this study, a multiwalled carbon nanotube (MWCNT) dispersion is used as an ink for a single-nozzle inkjet printing system to produce a planar coil that can be used to determine strain wirelessly. The MWCNT dispersion is non-covalently functionalized by dispersing the CNTs in an anionic surfactant, namely sodium dodecyl sulfate (SDS). The fabrication parameters, such as sonication energy and centrifugation time, are optimized to obtain an aqueous suspension suitable for an inkjet printer. Planar coils with different design parameters are printed on a flexible polyethylene terephthalate (PET) polymer substrate. The design parameters include a different number of windings, inner diameter, outer diameter, and deposited layers. The electrical impedance spectroscopy (EIS) analysis is employed to characterize the printed planar coils, and an equivalent electrical circuit model is derived based on the results. Additionally, the radio frequency identification technique is utilized to wirelessly investigate the read-out mechanism of the printed planar MWCNT coils. The complex impedance of the inductively coupled sensor undergoes a shift under strain, allowing for the monitoring of changes in resonance frequency and bandwidth (i.e., amplitude). The proposed wireless strain sensor exhibits a remarkable gauge factor of 22.5, which is nearly 15 times higher than that of the wireless strain sensors based on conventional metallic strain gauges. The high gauge factor of the proposed sensor suggests its high potential in a wide range of applications, such as structural health monitoring, wearable devices, and soft robotics.

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Section: Resultsmentioning

confidence: 99%

“…For the CPE element, no clear trend change was noticed, and also, almost no change in the true capacitance was remarked (change is less than 0.002%) [ 40 , 45 ]. This is referred to by the very low tunneling capacitance value that appears to not be detectable by the EIS measurement.…”

Section: Resultsmentioning

confidence: 99%

Inkjet-Printed Multiwalled Carbon Nanotube Dispersion as Wireless Passive Strain Sensor

Benchirouf,

Kanoun

2024

Sensors

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“…The coefficient coupling of dual-mode can be calculated from the odd-mode frequency (𝑓 𝑜 ) and the evenmode frequency (𝑓 𝑒 ) as given by ( 8) [25], [26].…”

Section: Filter Designmentioning

confidence: 99%

Compact 3D monolithic microwave integrated circuit bandpass filter based on meander resonator for 5G millimeter-wave

Sinulingga,

Nasution

2024

IJECE

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Bandpass filters for millimeter-wave band applications are typically designed using resonators. However, the design of a multilayer coplanar waveguide (CPW) monolithic microwave integrated circuit (MMIC) bandpass filter for 5G millimeter-wave band, n257 with operating frequencies from 26.5 to 29.5 GHz is still not available. Therefore, in this work, a compact bandpass filter for 5G millimeter-wave application was designed with multilayer CPW MMIC bandpass filter based on a meander resonator. The meander resonator of the bandpass filter was designed using low-loss multilayer CPW lines. In designing the bandpass filter, the resonator length and perturbation was utilized to optimize the resonance and bandwidth, and meander resonator was used to miniaturize the bandpass filter. As result, a compact bandpass filter with size of 0.75×0.75 mm<sup>2</sup> for 5G millimeter-wave band n257 was achieved. It has bandwidth of 3 GHz, an insertion loss of -2.87 dB and a return loss of -11.1 dB at frequency 28 GHz.

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“…The coupling coefficient is a calculated empirical measure of the amount of magnetic flux sharing between coils and is therefore a parameter that engineers seek to maximise to promote the greatest efficiencies of their systems. There are other applications such as in meta-material and microwave antenna design where a clear understanding of the relationship between the angle or separation of adjacent coils, and the coupling factor is desired [6]. However, the computation of realistic coupling coefficients for arbitrary coil geometries, relative proximities and orientations to one another is non-trivial.…”

Section: Introductionmentioning

confidence: 99%

Analytical Approximations for Fitting Magnetic Coupling Coefficients Between Adjacent Coils

Hughes,

Arroyo,

Mulholland

2024

IEEE Trans. Magn.

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This paper presents a simple yet novel two-dimensional modelling approach for approximating the coupling coefficient between neighbouring inductors as a function of co-planar separation and relative angular displacement. The approach employs simple geometric arguments to predict the effective magnetic flux between inductors. Two extreme coil geometry regimes are considered; planar coils (i.e. on printed circuit board), and solenoid coils, each with asymmetric ferrite cores about the central magnetic plane of the inductor. The proposed geometric approximation is used to predict the coupling coefficient between sensors as a function of separation distance and angular displacement and the results are validated against two-dimensional finite element modelling results. The analytical approximations show excellent agreement with the FE analysis, predicting comparable trends with changing separation and angular displacement, enabling best fitting to FE data with a residual standard deviation of < 2%. The work demonstrates the validity of the analytical approximation for predicting coupling behaviour between neighbouring coils. This has practical uses for the automated estimation of the physical separation between coils, or the curvature of surfaces they are rested or adhered to.

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Coupling Coefficients of Resonators in Microwave Filter Theory

Cited by 33 publications

References 22 publications

Inkjet-Printed Multiwalled Carbon Nanotube Dispersion as Wireless Passive Strain Sensor

Inkjet-Printed Multiwalled Carbon Nanotube Dispersion as Wireless Passive Strain Sensor

Compact 3D monolithic microwave integrated circuit bandpass filter based on meander resonator for 5G millimeter-wave

Analytical Approximations for Fitting Magnetic Coupling Coefficients Between Adjacent Coils

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