为了实现一维频率扫描,设计了一个X波段的串馈频扫平面阵列天线.单个功分器采用四分支定向耦合器,并且引入低通滤波结构,在实现大功分比设计的同时还解决了两输出口间的相位偏移问题.采用低损耗空气带状线作为馈线,有效降低了串馈频扫天线的损耗.馈电网络与天线阵列独立设计,降低了对计算机硬件的要求.实测结果表明,所设计阵列可实现-27°~30°的一维扫描,副瓣电平低于-22 dB.%In order to achieve one dimensional scanning,a frequency scan antenna array was designed in this paper, which works in X-band. Firstly, designed a single power driver which realized by four branch directional coupler. In order to reduce the phase deviation and achieve large power ratio, a low-pass filter structure was introduced to power driver. Secondly, using low loss air stripline as feed line, effectively reduce the loss of the crossfeed frequency scan array. Feed network and antenna array were designed independently, reduced the demand for computer hardware. Lastly, test results show that the designed array can realize one-dimensional scanning, sidelobe level below-22 db.
展开▼
