This work describes wide-incident-angle radio-wave absorbers for millimeter-wave (mmW) and sub-terahertz (sub-THz) applications. A loop-shape frequency-selective surface (FSS) is employed to improve ...

Based on the parabolic approximation of Helmholtz equation, a three-dimensional (3-D) vector parabolic equation (PE) technique for predicting propagation loss in large region irregular terrain is ...

From the front lines of the Cold War to the trenches of Ukraine, archival photos tell the story of Radio Free Europe, which ...

Scientists say the phenomenon could “hint at” new particles or interactions between known particles that haven’t been ...

Radio telescopes saw a strange burst of unknown energy in June 2024. Now we know it was from Relay 2, an early ...

Astronomers in Australia picked up a strange radio signal in June 2024 — one near our planet and so powerful that, for a ...