Characteristic Analysis of Double Spiral Resonator for Wireless Power Transmission

• Published in: IEEE transactions on antennas and propagation Vol. 62; no. 1; pp. 411 - 419
• Main Authors: Wei Wei, Kawahara, Yoshihiro, Kobayashi, Naoki, Asami, Tohru
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01.01.2014; Institute of Electrical and Electronics Engineers
• Subjects: Applied classical electromagnetism; Applied sciences; Circuit properties; Couplings; Double spiral; Electric, optical and optoelectronic circuits; electromagnetic field analysis; Electromagnetic wave propagation, radiowave propagation; Electromagnetism; electron and ion optics; Electronics; Equations; equivalent circuit; Equivalent circuits; Exact sciences and technology; Fundamental areas of phenomenology (including applications); Mathematical model; Microwave circuits, microwave integrated circuits, microwave transmission lines, submillimeter wave circuits; parameters' effect; Physics; Power transmission; resonance coupling; Resonant frequency; Spirals; wireless power transmission; Printing; Ultrathin films; Affect affectivity; Costs; Electromagnetism; Q factor; parameters' effect; Experimental study; electromagnetic field analysis; Modeling; Microwave power transmission; Double spiral; wireless power transmission; Efficiency; Network analysis; Equivalent circuit; Electromagnetic field; Resonance; Microwave resonator; Ink jet printer; resonance coupling
• ISSN: 0018-926X; 1558-2221
• DOI: 10.1109/TAP.2013.2287521

In this paper, we focused on comprehensive analysis and experiment of a unique resonator pattern, named "double spiral resonator" in wireless power transmission (WPT) via resonance coupling, which is suitable for printing on ultra-thin and low-cost substrates such as paper or film with ink-jet printing technology. By conducting contrast experiments with other two patterns of resonators, the comparing result shows that double spiral resonator ensured higher peak transmission efficiency in longer distance. Five structural parameters of double spiral resonator have been investigated for the effect on the peak transmission efficiency concerned. Also, equivalent circuit (EC) analysis of peak transmission efficiency has also been derived to find the theoretical explanation of the phenomenal parameters' effect on transmission efficiency. We also contributed by exploiting electromagnetic (EM) field calculation method to obtain the coupling coefficient of two double spiral resonators at different distances via the parasitic parameters of the resonators. Lastly, we also conducted a discussion on how parameters can affect the quality factor Q of double spiral resonator.