Magnetic Pendulum Array for Efficient Wireless Power Transmission

Tech ID: 29797 / UC Case 2018-005-0


UCLA researchers in the Department of Electrical Engineering have developed a novel magnetic pendulum array based mechanical antenna system for near field wireless power transfer with a 2-3 orders of magnitude improvement in quality factor.


Near-field based wireless power transmission requires high quality factor antenna to transfer power efficiently over a long distance. For the existing inductively coupled wireless power transmission systems, the transfer efficiency and effective rate are limited by the quality factor of the coils. Previously designed mechanical systems such as spinning magnets take advantage of the high quality factor and low dissipation in a mechanical system, but the low power conversion efficiency in driving the motor mechanically limits the system-wide efficiency. There exists a need for an antenna technology that offers much higher efficiency and sustains a much longer effective range for efficient long-distance wireless power transmission.


UCLA researchers in the Department of Electrical Engineering have developed a novel mechanical antenna system for near-field wireless power transmission. The antenna uses a magnetic pendulum array excited by RF coils to transmit and receive of the wireless power at an ultra-low frequency (ULF) of below 1kHz. The designed magnetic pendulum, sometimes termed a “perpetually moving machine,” offers a quality factor 2-3 orders of magnitude higher compared to the state of art antennas made of coils. Therefore, wireless power transmission systems made of the invented antenna technology will offer much higher efficiency and sustain a much longer effective range.


  • Wireless power transmission 
  • Wireless communication 
  • Electric Vehicles 
  • Electronic portable devices


  • High quality factor 
  • High system efficiency 
  • Long effective transmission range

State Of Development

System demonstrated for proof of concept.

Patent Status

Patent Pending


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  • Wang, Yuanxun E.

Other Information


magnet, power, transmission, energy, mechanical, quality factor, antenna, wireless, inductively coupled, coil, RF

Categorized As