Ismail Aghdam was interested in bandpass deltasigma modulator, intended for the A/D conversion of RF signals directly coming from a shortwave receiver antenna."
https:// www.ele.uva.es/~jesus/analog/hfradio.pdf
Further to this:
A rectenna is a rectifying antenna—a special type of antenna that is used for converting electromagnetic energy into direct current (DC) electricity. They are used in wireless power transmission systems that transmit power by radio waves.
www.militaryaerospace.com › Home › Defense ExecutiveApr 27, 2016 - KIRTLAND AIR FORCE BASE, N.M., 27 April 2016. U.S. Air Force researchers are asking industry to develop power sources and antennas for future high-power microwave weapons and for other aerospace and defense uses.