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针对WLAN的MIMO系统应用要求,并缩小天线所占据的空间,设计具有高端口隔离度的双极化贴片天线。采用共面带状线馈电的环形贴片和微带馈电单极贴片相结合形式,利用环形辐射元与单极子辐射元产生正交线极化的特点,实现双馈双极化天线。实验结果显示,所设计天线的工作频带范围为2.27~2.73GHz,端口隔离度在31dB以上。同时,单极结构辐射元主极化要比其交叉极化大25dB以上,环形结构辐射元在较大空间范围内其主极化比交叉极化大23dB以上。这表明所设计双馈双极化天线具有较高的端口隔离度,且有良好的极化纯度。通过结构参数调整,还可望同时覆盖5.8GHz频段,以满足IEEE802.11n标准要求。
For WLAN applications, MIMO system requirements and reduce the space occupied by the antenna, designed with high port isolation dual-polarization patch antenna. By using the combination of a circular patch with a coplanar stripline feed and a monopole patch with a microstrip feed, the characteristics of the orthogonal linear polarization generated by the annular radiation element and the monopole radiation element are used to realize double-fed dual-polarization antenna. The experimental results show that the working frequency range of the designed antenna is 2.27 ~ 2.73GHz and the port isolation is above 31dB. At the same time, the main polarization of monopole structure is larger than that of its cross-polarization by more than 25dB. The main structure polarization of the ring structure is larger than that of cross-polarization by more than 23dB in the large space. This shows that the design of doubly-fed dual-polarization antenna with high port isolation, and has good polarization purity. Through structural parameter adjustment, it is also expected to cover the 5.8GHz frequency band at the same time to meet the requirements of the IEEE802.11n standard.