"If you look closely, you will see that the inlet is in trapezoid shape, meaning the opposide sides are not parallel to each other, unlike the paralleogram type air intakes which you see in most 4.5 Gen fighters, including the reduced RCS ones and Su-57. Also, it is highly blended with the Wing Shoulder. If somebody has some actual design knowldge of Stealth design, they'll know that parallel sides , bulges, sharp angles are one of the highest source of RCS and that's why in Stealth design, they should be avoided. That's the reason, F-22 has trapezoidal wings so that two sides of the wings are not parallel, slightly angled tailplanes (in Trapezoidal shape as well) so that tailplanes are not parallel to each other and zagged design at the end of the singtips to reduce sharp corners and angles. TAI literally using the copy-book design which can lead to lower RCS in different frequencies (S Band, X Band, C Band and L Band) like F-22, and unlike Su-57 design which are mainly for X- Band Radar, mainly used in Fighter aircrafts."
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While the aircraft's aerodynamically stealth characteristics have taken a lot from the F-22, which has proven itself in this field, on the avionics side, it seems to be highly influenced by both the Russian school and the JSF's sensor fusion.