China working on terahertz radar prototypes
Several prototype terahertz radars have recently been built and tested by China’s research and development institutes,
according to a report published by the state-owned Global Times newspaper on 18 March.
The report described the radars as “anti-stealth radars”,
highlighting that one of the attributes of radars operating in the 300 GHz – 3 THz band is their ability to penetrate many materials to reveal objects under the surface.
This applies to the skin of stealth aircraft, resulting in return signals reflected from the aircraft structure that negate its stealthy properties.
However, the report acknowledged that the atmospheric absorption of signals at these frequencies results in very short detection ranges that are insufficient to detect hostile stealth aircraft before they are in striking range.
Jane’s 360
https://www.janes.com/article/87495/china-working-on-terahertz-radar-prototypes