Science Daily  November 20, 2019 Researchers in South Korea made the antenna by spray-coating several layers of NbSe2 nanosheets onto a plastic substrate. In tests an 885 nm-thick antenna, a 10 × 10 mm patch of the ultrathin material performed well, with a radiation efficiency of 70.6% propagating radio frequency waves in all directions. By changing the length of the antenna, the frequency could be tuned from 2.01 to 2.80 GHz, which includes the frequency required by Bluetooth and Wi-Fi technologies. The antenna could be bent and stretched without large changes in its performance. In addition to wearable electronics, the […]