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Sound Waves: Resonance

Sound Waves: Resonance

Resonance is produced depending on the boundary conditions imposed on a wave. Resonance can be produced in a string under tension with symmetrical boundary conditions (i.e., has a node at each end). A node is defined as a fixed point where the string does not move. The symmetrical boundary conditions result in some frequencies resonating and producing standing waves, while other frequencies interfere destructively. Sound waves can resonate in a hollow tube, and the frequencies of the sound...

Characteristics of Series Resonant Circuit

Characteristics of Series Resonant Circuit

Series resonance occurs in a circuit containing inductive (L), capacitive (C), and resistive (R) elements connected sequentially. At the resonance frequency, the inductive and capacitive reactances are equal in magnitude but opposite in sign, effectively canceling each other. This causes the circuit's impedance is minimal, primarily determined by the resistance R. The resonant frequency of an RLC circuit is defined as:

Generating Electromagnetic Radiations

Generating Electromagnetic Radiations

The German physicist Heinrich Hertz (1857–1894) was the first to generate and detect certain types of electromagnetic waves in the laboratory. Starting in 1887, he performed a series of experiments that confirmed the existence of electromagnetic waves and verified that they travel at the speed of light. Hertz used an alternating-current RLC (resistor-inductor-capacitor) circuit that resonated at a known frequency and connected it to a loop of wire. High voltages induced across the gap in...

Series Resonance

Series Resonance

The RLC circuit impedance is defined as the ratio of the supply voltage to the circuit current. Resonance in such a circuit occurs when the imaginary part of this impedance equals zero. This specific condition means that the inductive reactance is exactly equal to the capacitive reactance. The frequency at which this happens is known as the resonant frequency. Mathematically, the resonant frequency is inversely proportional to the square root of the product of the inductance (L) and capacitance...

Resonance in an AC Circuit

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The property of an inductor makes it resist any change in the current passing through it, while the property of a capacitor is to build up the charge across its terminals. Hence, if an inductor and capacitor are connected in series, they have opposite effects on the relative phase between current and voltage. The current through the circuit undergoes forced oscillation at the frequency of the source. The resistance term in an R-L-C circuit acts as a damping term because power is dissipated...

Parallel Resonance

Parallel Resonance

The parallel RLC circuit is an arrangement where the resistor (R), inductor (L), and capacitor (C) are all connected to the same nodes and, as a result, share the same voltage across them. The parallel RLC circuit is analyzed in terms of admittance (Y), which reflects the ease with which current can flow. The admittance is given by:

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Updated: Jun 7, 2025

Microwave Photonics Systems Based on Whispering-gallery-mode Resonators

Microwave Photonics Systems Based on Whispering-gallery-mode Resonators

Published on: August 5, 2013

Arrangement Free Wireless Power Transfer via Strongly Coupled Electrical Resonances.

Bonyoung Lee¹, Jungho Kim¹, Hyunkyeong Jo¹

¹Department of Electrical Engineering, Ulsan National Institute of Science and Technology (UNIST), 50 UNIST-gil, Ulsan, 44919, Republic of Korea.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)

|November 21, 2024

Summary

Electrically resonant wireless power transfer (ERWPT) offers consistent efficiency, overcoming magnetic limitations. This breakthrough enables practical wireless power applications with improved receiver freedom.

Keywords:

electrical resonance midrange receiver arrangement free wireless power transfer

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Area of Science:

Electrical Engineering
Physics

Background:

Magnetically resonant wireless power transfer (MRWPT) faces challenges in power transfer efficiency (PTE) due to the nature of magnetic fields.
Achieving receiver freedom in MRWPT remains a significant limitation for practical applications.

Purpose of the Study:

To introduce and evaluate electrically resonant wireless power transfer (ERWPT) as an alternative to MRWPT.
To demonstrate ERWPT's capability for consistent PTE regardless of receiver arrangement.

Main Methods:

Utilizing an open bifilar coil operating at a resonant frequency for ERWPT.
Conducting experiments to measure power transfer capabilities and PTE over distance.

Main Results:

Demonstrated nonradiative power transfer up to 50 watts over 2 meters.
Achieved 46% PTE with consistent performance, independent of receiver placement.
Highlighted the role of electric charge monopole properties in ERWPT's success.

Conclusions:

ERWPT overcomes the inherent limitations of MRWPT, particularly concerning PTE sensitivity to receiver position.
ERWPT presents a viable and efficient solution for practical wireless power transfer applications.
Further research is suggested to explore the full potential and applications of ERWPT.