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A millimeter-band dielectric embedded dual-beam antenna is designed and simulated, which is based on microstrip antenna theory, the Yagi antenna principle and the design method of dielectric embedded microstrip antenna. The antenna buries improved planar printed microstrip Yagi antenna in the dielectric to form a dielectric embedded antenna. The director element of traditional Yagi antenna is changed from one to two, which is used to constrain the beam direction and increase the gain. By using an additional parasitic patch to improve the antenna, a larger relative impedance bandwidth is obtained, and the relative bandwidth is increased from 6.87% to 7.62%, and the gain is 9.96dB, which can be applied to short-distance communication and has good application value.

A sensitive coefficient was put forward to study the effect of random errors on the directivity of six amplitude-weighted line arrays. Studies show that: random errors cause the loss of directivity, and amplitude weights influence that kind of loss slightly. In addition, that kind of loss has a linearity relationship with the distance between neighboring units; and the larger the line array is, the greater the loss will be.