Why is radar hard to detect stealth aircraft while satellite telephones easily capture signals below the thermal noise floor?
In: Engineering
Because stealth aircraft like the F-117 are designed so they reflect the radar signal away, at a completely different angle.
The F-117 still receives incoming radar it’s just that the radar reflection is never seen by the enemy radar set.
The F-117 does this by being constructed from flat surfaces that reflect the radar in one direction only. Curved surfaces would reflect radar in all directions.
Technically no aircraft is 100% invisible. They minimise their radar signature. Some have the same radar signature as a seagull. As soon as the aircraft opens bomb doors or lowers undercarriage or even carries external stores like the F-35 then the radar signature becomes less stealthy more observable
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