Design Of W Band Substate Integrated Waveguide Slot Array Antennas

With the rapid development of modern communication technology, the whole system trends to become low profile, light weight, low cost and high integration density, and the operation frequency of communication system becomes higher and higher, guide wave structure is developing with the system. The traditional metal waveguide are low loss, low radiation, high power capacity, etc. But because of its weight is heavy, bulky, expensive and difficult processing, so integration is difficult. Although plane structure, such as microstrip line, plane waveguide and so on, is small volume, light weight, low cost, and high integration. But Because of this structure belongs to a half open structure, the transmission performance performance is poorer at high frequency, and the Radiation is more. Although substrate integrated waveguide is a kind of planar wave guide structure, but its propagation characteristics is similar to the traditional waveguide, so it has advantages of both of these two kinds of structure. If we hold the balance between size and performance in the design application, the advantage of the substrate integrated waveguide can be played very well.The influence of key parameters on the transmission performance of substrate integrated waveguide is studied in this paper. Based on the study, the key parameters of the integrated waveguide based on 94 GHz are determined. By means of theoretical analysis and simulation verification, it is proved that the method can be used to simulate the modeling and Simulation of the substrate integrated waveguide instead of the substrate integrated waveguide, which greatly improves the efficiency of the antenna optimization simulation. By using the method of equivalent circuit analysis, the radiation characteristics of the single slot antenna are analyzed, and the admittance parameters of the single slot antenna with different offset and length are simulated. In Chebyshev level distribution based, Matlab programming method is used to design 32 elements slot array antenna and found due to the array element number, the two sections of the array element level occurred jump, after using Taylor level distribution solved very well at both ends of the array element level jump variable. The traditional design method of slot array is not to consider the effect of the coupling between the gaps, which causes the design of the antenna port mismatch, and the return loss is very difficult to achieve. The Elliott equation and Taylor level combining method, using Matlab programming, calculating slot offset and fracture length, due to Elliott equation considering the coupling between the cracks, calculation results is obviously superior to the traditional method, a very good solution to the traditional design method because of not considering the gap between the coupling caused by the mismatch problem. Based on the substrate integrated waveguide structure of the special performance, multiple linear array arrangement of H-plane patterns influence is very small, can increase the arra y gain. In this paper, the design of the 16×32 planar array, and through different forms of feeding structure design, the antenna H face and figure. The central frequency of the antenna is 94 GHz, the reflection loss is small-10 d B within 92.5 ~ 95.5GHz, the antenna gain reaches 33 d Bi, the sidelobe level is less than-24 d B, and the maximum zero depth of the differential beam pattern is reached-40 d B.