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All of your questions are valid but can be addressed using just one word; TIME.
With time things improve my Guy
First of all this "burn through" thing is not exactly true and even if it's remotely then also a simple Faraday Cage can complete negate it.
Now coming to size and power.
• This is STIR radar from 1990s
View attachment 19945
A Cassegrain antenna of 1.2m diameter, a power consumption of 5kW to achieve an instrumented range of 36km for missiles type target in X-band.
The whole system weighs 2-3 tonnes.
• This is exMHR radar from 2024
View attachment 19946
A GaN AESA of dimensions 90x120x30cm, a power consumption of 2.5kW to achieve an instrumented range of 60km for low RCS targets in X-band.
The whole system weighs just 150kg.
Again, time
• this is AN/TPY-2 radar from 2000
View attachment 19947
Extremely capable X-band radar used for the THAAD system, can reportedly track targets beyond 3,000km. It's power requirement is 1.1MW at peak.
• this is Honeywell's turboshaft auxiliary power generator from 2024
View attachment 19948
This thing is very efficient, weighs less than 130kg but manages to generate 1MW of peak power.
By mounting it on a HALE platform who's last two letters stand for Long Endurance.
The already pretty old RQ-4 HALE UAVs managed to sustain 30+ hours of flight.
How are the aircrew going to deal with sleep, hunger, fatigue of 30+ hours of flight?
Here also I could have given you example of how modern SatCom antennas use a teeny tiny beam of radio waves with LPI characteristics to talk to a satellite above them, not a ground station instead of just emitting radio waves all around like WW2 antennas.
But instead, I'll ask you a simple question.
What is more likely to give away a plane's position because of its radio emissions; a multi kW AWACS radar or a single data-link?
lol @ faraday cage. the entire crux of the modern day fighter is to operate a platform that can utilize avionics and electronics as advanced as possible. There have been incidents(for example in NATO training exercises) where some AWACS operators thought they were being locked up by something not friendly, and sent a full power pulse to the fighter jet in question - the entire fire control radar was fried and the avionics dead.
The second point is that "burn through" is a real thing in electronic warfare - especially for defeating electronic jamming at long ranges. The power of the radar, in some cases, directly translates to the distance at which it can reliably get a range and bearing on the jamming aircraft.
The modern day AESA breakthrough is undeniable, but you still need radars in bigger sizes to actually perform anything at good distances(for AWACS, this extends to anywhere from 200-400 nautical miles, which is like some 500km+). The powerplant looks promising, so let's see how it pans out.
LPI technology is already being used in SATCOM/data-links for various planes and radars. However even if you have something like a FDMA/CDMA it still requires that your signal make it out alive in all the noise/jamming available in the modern day battlefield. What happens when you lose contact with your AWACS HALE?
The biggest point that you seem to be missing is that the AWACS is not just a plane with a bunch of dudes on it who detect other enemy planes. They're in charge of a BIG chunk of C2 operations on the air battlefield, which includes but is not limited to:
- Managing complex ATO(air tasking orders) like SEAD, DEAD, OCA, DCA, CAPs, ...
- Communication relays
- Electronic intelligence
- Cooperation with other aircrafts like JSTARs
- Battle management systems
As for crew fatigue: this is a non-factor. All AWACS crew, if on a long endurance mission, have secondary or tertiary crews. They can be swapped out.
Now your last point about multi KW AWACS radar: as you must know at this point, this LPI technology with AESA radars is also used on AWACS aircraft; and detection via RWR/passive scanners is a possibility only when the PRF and power used by the AWACS is high enough so that the enemy aircraft can actually get some meaningful radiation. I recommend searching about RWS/TWS/STT modes available on fighter aircraft radars - the AWACS thing is kind of similar.