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What are the main radar stealth technologies currently used?
Shape design technology, absorbing material technology and offset technology.

Overview of Radar Stealth Technology

Quoted from: Institute of Hefei Institute of Electronic Engineering, Anhui Province

The realization methods of radar stealth technology are summarized from five aspects: shape design, absorbing materials, cancellation, interference and microwave propagation indication technology. The methods and shortcomings of reducing radar cross-sectional area by using shape design technology are analyzed. The development direction of absorbing materials technology is to develop mechanism absorbing materials, and several new radar absorbing materials are introduced.