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.