Which of the following statements with regard to stealth technology is/are correct ? 1. Stealth objects have a very small radar cross-section and are coated with Radar Absorbing Material. 2. Stealth objects can be detected using specific frequencies. 3. Stealth objects are coated with metamaterials to increase the scattering of electromagnetic radiation. Select the answer using the code given below :

Option (C) — 1 and 2 only

• Stealth technology is designed to make aircraft, ships, and other military vehicles less visible to radar, infrared, and other detection methods. A key feature is minimizing the radar cross-section (RCS) through shape design and Radar Absorbing Materials (RAM).
• Stealth objects can potentially be detected using specific radar frequencies, particularly lower frequencies (VHF and UHF bands). Low-frequency radars have wavelengths comparable to aircraft dimensions, making stealth shaping less effective.
• Metamaterials in stealth applications are designed to reduce scattering of electromagnetic radiation, not increase it. The goal is to redirect or absorb radar waves rather than scatter them, making the object less detectable.

• 1. Stealth objects have a very small radar cross-section and are coated with Radar Absorbing Material: Correct. Stealth design combines geometric shaping to deflect radar waves and RAM coatings to absorb radar energy, both reducing RCS.
• 2. Stealth objects can be detected using specific frequencies: Correct. Low-frequency radars (VHF/UHF) can detect stealth aircraft because stealth shaping is optimized against higher-frequency radars. Bistatic and multistatic radar systems also help.
• 3. Stealth objects are coated with metamaterials to increase the scattering of electromagnetic radiation: Incorrect. Metamaterials in stealth are used to reduce or redirect scattering, not increase it. Increasing scattering would make the object more visible to radar, defeating the purpose of stealth.