BOOSTXL-AOA: Non sine waveform received IQ signal

Part Number: BOOSTXL-AOA


As the tutorial said, “If there is no antenna toggling, then the I/Q samples will form a perfect sine wave. To prove it, change the antenna toggling pattern from 2 antennas to 1 antenna(A1.2), and see how the I/Q plots look like.”

When the IQ signal I got from a big conference room, I believe much less multipath, I get the IQ signal (from fixed antenna. Fixed channel and fixed RSSI) is like

Morever, in different package, the IQ waveform is not the same

Which does not look like the sine-waveform, is there anything I missed.