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介绍了一种应用于宽带二维扫描平面阵列的印刷天线的单元结构,在工作频带内(3-6GHz)±30度扫描范围内天线单元的有源电压驻波比小于2.5。该天线单元由介质板加反射板双层结构构成,两板相距1/4工作波长,由同轴线相连接,能有效减小天线单元的面积并改善天线的阻抗带宽、前后比等。在单元基础上设计了49元阵列天线的仿真结果表明了设计的有效性。该天线在卫星通信、微波中继通信、WPAN等领域具有潜在的应用价值。
An element structure of a printed antenna used in a wideband two-dimensional scanning planar array is introduced. The active voltage standing wave ratio of the antenna element is less than 2.5 within a scanning range of ± 30 degrees in the operating frequency band (3-6GHz). The antenna unit is composed of a dielectric plate and a reflection plate double-layer structure. The two plates are separated by 1/4 working wavelength and connected by a coaxial line, which can effectively reduce the antenna unit area and improve the impedance bandwidth, front-to-back ratio and the like of the antenna. The design of a 49 element array antenna on the basis of the simulation results show the effectiveness of the design. The antenna in satellite communications, microwave relay communications, WPAN and other fields have potential applications.