Antennas installed at 18 U.S. high schools detected bursts of radio activity that can precede solar disturbances capable of ...

Mechanical antennas represent a disruptive approach to low-frequency communication by exploiting the mechanical oscillation of electric charges or magnetic dipoles to generate electromagnetic ...

A frequency-tunable tri-band metamaterial-inspired antenna is proposed. The antenna consists of patches, interdigital capacitors, and meander lines inductors, and loaded with a split ring resonator.

In conventional multiband base station antennas, the beam direction is the same for all shared frequency bands; however the electrical length of the antenna becomes shorter and the beam width becomes ...