一种具有双频段的新型分集微带天线设计

Design of a novel diversity microstrip antenna with two frequency bands

提出了具有高隔离度的新型双频分集微带天线。天线的辐射单元由2个对称的非均匀圆环单极子组成,为了提高隔离度,天线的去耦结构采用分离式接地平面,并在接地平面上引入T形分支结构。分析了天线关键结构参数对天线性能的影响,实际制作了天线,给出了所设计天线的仿真与测试结果,二者吻合较好。所设计的天线具有2.4～2.484GHz WLAN和3.4～3.69GHz WiMAX 2个工作频段,在2个频段中,天线具有较好隔离度(S12<-20dB)。同时,它的辐射区域空间互补,可有效克服多径衰落,提高系统性能。

A novel compact diversity microstrip antenna with dual-band and high isolation is presented in this paper. In the antenna, two non-uniform disc-liked monopoles whose outers are cut down partially are collocated symmetrically on the top side of the substrate,and the bottom side of the substrate is ground plane. To improve isolation, the separated ground and a T-shaped branch structure on the ground plane are adopted. In the paper,the effects of the key structure parameters on the performance of the antenna are analyzed. The antenna was fabricated and measured. The simulation results are in good agreement with the measurement. The antenna is with two bandwidths to cover 2.4- 2. 484 GHz WLAN and 3.4-3.69 GHz WiMAX operating bands. Meanwhile, high isolation （S12 〈-20 dB） is obtained for the two operating bands. Moreover, the radiation regions of the proposed antenna cover the complementary space, which can overcome the multipath fading and enhance the system performance.