设计出了一种双背馈空气夹层微带圆极化天线单元，该天线单元具有13％的阻抗带宽，最大辐射方向上轴比2．5dB。用该天线单元以顺序旋转的方式组成四元阵，再用八个该天线单元和两组一分八功分器组成八单元阵列，研究了该阵列天线圆极化波束分别指向天线阵法向和偏转30°时的辐射特性和极化特性。该天线单元组阵圆极化轴比特性好，易于实现波束扫描，适合用于有源相控阵系统。%A planar dual-back-fed circularly-polarized microstrip antenna is proposed based on the air mi- crostrip structure. The element has 13% impedance bandwidth and the axial ratio of maximum radiation direction is 2.5 dB. Based on the element design, a rotationally symmetric four-element array is also de- signed. Furthermore, in order to verify the circularly-polarized beam scanning characteristics of antenna array, an eight-element array is composed by eight elements and two power splitters to realize the beam pointing to the normal direction and 30° deviation respectively. The antenna owns good circular polarization axial ratio and is easy for beam scanning, which is very suitable for the active phased array applications.
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