This paper demonstrates an 18–40GHz four-arm planar log-periodic antenna with integrated wideband hybrid fabricated using printed circuit board (PCB) process. The two orthogonal linear polarizations ...

The periodic table of elements (often known simply as the periodic table) has been helping scientists with their work for a little over 150 years. The handy visual reference guide organizes known ...

Antarctic research reveals how rare earth elements move underground through freeze-thaw cycles in desert environments.