I check some documents and questions in forum about antenna simulation and test. I simulated antenna with provided dimension accoding to PCB document but at 78.5GHz maxmum gain is not at 0 degrees. There is a simulation result showed at 78.5GHz maxmum gain is at 0 degrees. Then I found another figure that radiation pattern offset a litter. And a answer to another question said "at 76 GHz the maximum gain should be at 0 degrees but this may be tilted at higher frequencies". Is radiation pattern of the antenna get maxmum gain at 0 degrees at 76GHz? Figures and the question on forum are attached.
https://dev.ti.com/tirex/explore/node?node=ALonOcdzxDaqqj3QHDB3mA__VLyFKFf__LATEST