DW3220 PDOA inaccurate,Large drift

Hello,I used dwm3000 as the pdoa tag and made a pdoa node with dw3220 by meself,Refer to dw1000 pdoa kit for PCB antenna design.As shown in the figure.
I use dw3000_ API_ C0_ rev4p0 “ex_01h_ simple_ tx_ Pdoa” and “ex_ 02h_ simple_ rx_ Pdoa” code test, the data output is not ideal, the angle drift is large, and the angle output jumps at ± 30 degrees when the tag(DWM3000) does not move. Do you have any good suggestions?Thanks.

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