2.45-GHz Rectenna Transmits Power Wirelessly

July 16, 2010

For energy-harvesting devices, the rectifying antenna (rectenna) is crucial. A broadband rectenna that uses a printed monopole antenna and bandpass stub bandpass filter has been developed by Tae-Ui Hong, Kyoung-Min Oh, Hyun-Wook Lee, Hee Nam, and Tae-Soon Yun from Seoul's Kwangwoon University together with Dae-Sung Lee, Hak-In Hwang, and Jong-Chul Lee from the Korea Electronics Technology Institute. This antenna was designed at 2.45 GHz for the wireless transmission of microwave power.

Because the rectifying circuit with a stub filter is fabricated on the groundplane, it does not increase the size of the antenna. That groundplane is widened to acquire the broadband characteristic of the monopole antenna. Using a 270-O load resistor, the rectenna can obtain RF-to-DC conversion efficiency of 66 percent. From 2 to 3 GHz, conversion efficiency above 50 percent is maintained. See "Novel Broadband Rectenna Using Printed Monopole Antenna And Harmonic-Suppressed Stub Filter," Microwave And Optical Technology Letters, May 2010, p. 1194.

About the Author

Nancy Friedrich

RF Product Marketing Manager for Aerospace Defense, Keysight Technologies

Nancy Friedrich is RF Product Marketing Manager for Aerospace Defense at Keysight Technologies. Nancy Friedrich started a career in engineering media about two decades ago with a stint editing copy and writing news for Electronic Design. A few years later, she began writing full time as technology editor at Wireless Systems Design. In 2005, Nancy was named editor-in-chief of Microwaves & RF, a position she held (along with other positions as group content head) until 2018. Nancy then moved to a position at UBM, where she was editor-in-chief of Design News and content director for tradeshows including DesignCon, ESC, and the Smart Manufacturing shows.