
why the 8 ADAR's are divided into L and R is there any specific reason for the same.
Is it something like L controls the Beam Vertically and the R controls the Beam horizontally.
ADAR1000
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The ADAR1000 is a 4-channel, X and Ku frequency band, beamforming core chip for phased arrays. This device operates in half-duplex between receive and...
ADAR1000 on Analog.com

why the 8 ADAR's are divided into L and R is there any specific reason for the same.
Is it something like L controls the Beam Vertically and the R controls the Beam horizontally.
This was just a way to organize the SPI buses for the Quad TRM Cells. The ADAR1000 can have up to four chips share the same CSB line due it having only 2 chip address pins. You see four of the Quads are connected to CSB_L and the other four are connected to CSB_R. The "L" and "R" designate Left side and Right side of the Stingray board.