| Conformal microstrip antennas are an important study field in microwave and communications. Conformal microstrip antenna has been widely used in many fields for it has many advantages. Compared to other conformal antennas, the cylindrically conformal microstrip antenna has a relatively simple structure. According to the design requirement of engineering project, overall blue print of GPS antenna and overall requirements are put forward, and related technology is analyzed. On the basis of the study on microstrip antennas, feeding patterns and circularly polarization of the microstrip antennas are studied carefully, the design formula of the plane rectangular microstrip antenna is presented, and a plane GPS microstrip antenna is analyzed by using HFSS simulation software. The resonant frequency and radiation of the cylindrically conformal rectangular microstrip antenna are analyzed, and then a simulation study is given. Based on the above analysis and research, specific designing plan for the cylindrically conformal microstrip antenna array is given. Feeding patterns of antenna array are researched and feeding network is designed. Three-unit and four-unit models for the cylindrically conformal microstrip antenna array are set up and their directivities are simulated respectively. Through the comparison of the simulation results, the four-unit array is proved to be feasible. Finally, the four-unit cylindrically conformal microstrip antenna array is processed and tested. Testing results indicate that, the input VSWR of the antenna array in the vicinity of 1.575GHz is less than 2, the omni-directional performance good, 3dB bandwidth is about 90 degree on axial plane, right-hand circularly polarization good. Overall performance of the antenna array satisfies the design requirements. |
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