Researchers revealed that the new low-power antenna is a type of millimeter-wave gradient index (GRIN) lens antenna. Although GRIN lenses have existed for over a century, the idea of developing a ...

One has a low resolution 200 mm wide-angle lens, and the other has a higher ... Planetary Radio Astronomy (PRA) and Plasma Wave Antennas (PWS)* The PRA used the two antennas to measure radio ...