A twin face rotating AESA derived from Type 346A would be a very economical, mature and low risk but still capable radar for the next generation frigate.Great find. These ships have tested all sorts of radars before. Not all of them went to service though, but they can be works in progress.
This one did not end up in service but was proposed for the trimaran frigate. Though it is single sided it looks related to the new radar.
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If you take the new radar on the Type 075, assume one side is the S-band and one side is the X-band, imagine if you have a variation to that radar where both sides are S-band, and that is what I expect this new radar would be. The array alone can be using technology from the Type 346A, so its like a down scaled, economy version, with only two sides and much less elements, which is a lot lighter on the billing invoice.
Being a smaller array than a full sized 346A and twin face means it could probably be mounted at the top of a mast like sea eagle, offering good radar horizon, and as a rotating twin face radar, if it is sufficiently fast then it would basically be somewhat similar to SAMPSON.
They've tested a number of seemingly solid state rotating, squarish radars on the test ships and on land before as well.