一种基于多模谐振的宽带贴片天线设计

Design of a Wideband Patch Antenna Under Multimode Resonance

设计了一种基于多模谐振的宽带贴片天线.首先,通过在一个矩形贴片上蚀刻两条缝隙的方式,使天线同时工作在TM_(10)和反相TM_(30)两个正交的模式来展宽天线的带宽;其次,通过在辐射贴片左右两侧的顶角处蚀刻4个方形缝隙,改善天线低频处的阻抗匹配,有效激励起缝隙模式,进一步展宽天线的工作带宽;为了激励这3个工作模式,天线采用缝隙耦合馈电方式,同时在微带馈线的终端加载方形贴片,来改善天线的阻抗匹配.测量和仿真结果吻合良好,天线的工作频带为2.09 GHz~2.77 GHz,相对带宽为27.9%.天线实现了良好的宽边辐射,峰值增益达到了6.3 dBi.

A wideband patch antenna under multi-mode resonance is designedinthis paper.By etching two slots on a rectangular patch,the antenna workssimultaneously in two orthogonal modes of TM_(10) and anti-phased TM_(30),which broaden the bandwidth of the antenna.In addition,four square slits are etched at corners of the radiation patch,improving the impedance matching of the antenna at low frequencies,effectively excite the slot mode,which further broadens the operating bandwidth of the antenna.The antenna introduced a aperture-coupled feeding method to excite three working modes at the same time.In order to improve the impedance matching of the antenna,a square patch is loaded on the terminal of the microstrip feeding line.Measured and simulated results are foundin good agreement with each other and both of them showthat impedance bandwidth is 27.9%.Besides,thegood broadside radiation is achieved.The peak gain of the antenna is 6.3 dBi.