为了满足C波段宽带通信的需求,设计一种缝隙耦合层叠结构的宽带高增益圆极化微带天线。采用双层切角的辐射贴片实现圆极化,并扩展天线的带宽;使馈线偏离介质板的中心,改善天线的轴比特性;采用金属反射板实现天线的定向辐射,并提高增益。天线实测结果表明,-10dB阻抗带宽达到32.2%(4.17~5.76GHz),3dB轴比带宽达到20.2%(4.25~5.25GHz),天线增益在轴比带宽范围内大于8.5dB。该天线实现了宽频带、高增益等特性,适合应用于C波段宽带通信。

In order to satisfy the requirement of broadband communication in C-band, a broadband high gain circularly polarized microstrip antenna with gap coupling laminated structure was designed. The radiation patch with double layered chamfering was used to achieve circular polarization and expand the bandwidth of antenna. The feeder was deviated from the center of the dielectric plate, and the axial ratio characteristic of the antenna was improved. The metal reflector was used to realize the directional radiation of the antenna, and the gain was increased. The measurement results showed that 10 dB impedance bandwidth of the proposed antenna reached 32.2%(from 4. 17 to 5.76 GHz) and the 3 dB axial ratio (AR) bandwidth reached 20.2% (from 4. 25 to 5. 25 GHz), and the gain of the antenna was greater than 8.5 dB in the axial ratio bandwidth range. With the characteristics of wide bandwidth and high gain, the antenna was suitable for C band broadband communication.