The B-21 will have regular stealth against higher-frequency engagement radar and also against lower-frequency surveillance radar. China and Russia have shifted to using a network of low-frequency radar to detect and locate stealth aircraft.
The B-21 will also have thermal management to try to make the aircraft somewhat aligned with the temperature of the surrounding air so as not to create a heat differential for enemy sensors to detect.
It will use new materials that are described as radar-absorbent. The radar’s electronic signal will be absorbed. Properly-completed stealth construction can make a stealth airplane appear like a bird or an insect to enemy radar.
Brian Wang is a Futurist Thought Leader and a popular Science blogger with 1 million readers per month. His blog Nextbigfuture.com is ranked #1 Science News Blog. It covers many disruptive technology and trends including Space, Robotics, Artificial Intelligence, Medicine, Anti-aging Biotechnology, and Nanotechnology.
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