I feel like radar based SAMs should be more intuitive to fight against instead of having a perfect solution on every target that's within their range (without taking stealth into account), making them hit very small targets that would logically be nearly impossible to hit reliably. So, I've made some illustration regarding the changes that i think would be better for the game.
The first image shows a situation where the radar shines at a target that is in it's detection range in search mode, which will report a track to the datalink, but it will have less resolution than a locked track which means that launching a SARH at this will pretty much guarantee a miss. This type of signal will be used by search radars like the HLT-R, fixed radars, like the Patriot for example or early warning radars. The RWR of the plane would display a yellowish orange line, indicating that the receiving radar was able to detect the target.
The second image shows a radar locking on to a target, the radar would receive very accurate information on the target like it's speed, position and possibly have the unique ability to identify the aircraft in specific if the devs decide to add further fog of war elements, this will make it able to reliably hit the target with a SARH missile, but if the radar has both abilities of tracking and searching, it's search ability would be reduced since it's trading most of it's power to lock a target, however systems like the Boltstrike would be able to have full situational awareness while tracking a target, since it has both types of radar mounted on to it and maybe it should have increased multi-target capabilities as well as the ability to track small munitions so that it remains a useful tool to defend SAMs that would be more vulnerable to this type of threat. In this case the RWR of the tracked target would display a red line, indicating that a radar is using way more power to shine the aircraft.