Unlike the beam pointing of phased array (PA), which is only angularly related, the beampattern of frequency diversearray (FDA)achieves electrical scanning with higher degree of freedom by introducing a frequency offset between array elements. In view of the problem that in radar direction detection, the interferometer can determine the arrival angle of the radiation signal by obtaining the phase difference of the radiation signal reaching the receiver through the phase comparatorwhich will threaten the safety of radar. Based on the “bending” characteristic of the FDA’s beam pattern, this paper studies the possibility of angle deception in the direction detection of enemy radar. Based on the rangeangle decoupling technologyrealized by FDA using nonlinear frequency offset, we can provethat logFDA and sinFDA can deceive interferometer direction finding under farfield conditions.And the deceptive effect of logFDA is better than that of sinFDA.We can also draw conclusionsthat the deceptive effect will enhance with the increase of frequency offset Δf and the array spacing d.