In this paper, a compact log-periodic dipole array (LPDA) antenna is developed at 0.5-10 GHz. This LPDA structure constitutes fewer dipole elements than a conventional LPDA antenna that exhibits ...

Quick geology lesson: There are 17 types of rare earths, and they’re used as the building blocks in cars, semiconductors, missiles, drones, and more. China mines 70% and processes 90% of the ...