Adaptive Impedance Matching of Wireless Power Transmission Using Multi-Loop Feed With Single Operating Frequency

• Published in: IEEE transactions on antennas and propagation Vol. 62; no. 5; pp. 2851 - 2856
• Main Authors: PARK, Byung-Chul, LEE, Jeong-Hae
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01.05.2014; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Adaptive matching; Antennas; Applied sciences; Capacitors; Circuit properties; Electric, optical and optoelectronic circuits; Electronics; Exact sciences and technology; Feeding; Feeds; Frequency measurement; Impedance matching; Inductance; magnetic resonance coupling; Matching; Mathematical model; Microwave circuits, microwave integrated circuits, microwave transmission lines, submillimeter wave circuits; multi-loop feed; Power transfer; Resonant frequency; Switches; Tracking; Wireless power transmission; wireless power transmission (WPT); Adaptive matching; Tracking; wireless power transmission (WPT); Magnetic resonance; Feeding device; Adaptive method; Microwave power transmission; multi-loop feed; Impedance matching; Magnetic coupling; High efficiency; Tracking(movable target); Selector switch; magnetic resonance coupling
• ISSN: 0018-926X; 1558-2221
• DOI: 10.1109/TAP.2014.2307340

In this communication, an adaptive matching method to improve wireless power transmission (WPT) efficiencies using a multi-loop feed with a single operating frequency is described. The proposed method uses various combinations of multi-loop; adaptive matching is realized using switches attached to each loop. The average efficiencies of the simultaneous matching method, frequency tracking method, and the multi-loop feeding method are measured as 86.9%, 72.6%, and 81.8%, respectively, in the power transfer distance range of 10 cm to 50 cm. With only one operating frequency of 13.56 MHz, the proposed method can support high efficiency that is close to the efficiency of the simultaneous matching method and also shows better WPT efficiency than does the frequency tracking method.