CST – Computer Simulation Technology

Wireless Power Transfer and Microwave Energy Harvesting

Recording date: November 7, 2013

60 min

Although wireless energy transfer is an old idea (Tesla patented one design in 1901), technological advances and the rise of portable devices have made it relevant again for different applications, such as wireless charging and energy harvesting.

This webinar will consist of two parts. The first part is a review of low frequency power transfer in two categories: short range-inductive charging and powering of electronic devices and electric vehicles, and mid-range power transfer through coupled resonant circuits. We will give several examples and highlight the role of simulation in the design of transfer systems. The tools in CST® STUDIO SUITE® used for the design and optimization of these devices will be demonstrated, including the use of hybrid circuit-EM co-simulation to optimize matching circuits to improve link robustness.

The second part of the webinar is concerned with wireless energy transfer over longer distances, where the far-field transfer of RF energy may be used. We make a distinction between harvesting RF energy from signals present in the ambient and transferring RF energy by intentionally transmitting RF signals. After a discussion of the power densities, we will continue with (intentional) RF energy transfer for powering sensors to be used in Smart Buildings. The blocks of a far field RF energy transfer system will be discussed: Transmit antenna (and maximum allowed transmit power), propagation channel and rectifying antenna or rectenna. The components of the rectenna: rectifier, dc-dc boost converter and antenna, will then be discussed. Several examples will be shown.

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