一种小型化频率可重构微带天线的设计

Design of a compact microstrip antenna with frequency reconfigurable characteristic

提出一种新型的小型化频率可重构微带天线.天线由1个倒L形的微带馈线、5个长宽不等的矩形贴片及1个阶梯型的接地面构成,天线整体尺寸为30 mm× 35 mm×1.6 mm.通过控制开关的状态选择相应的辐射单元,可改变表面电流分布,获得不同的工作频段,实现各个状态间的切换.该天线的10个有效工作状态可以等效覆盖1.89～1.92 GHz、2.16～2.32 GHz、2.39～2.91GHz、3.30～3.69 GHz、5.05～5.85 GHz5个不同的频段,各个状态下天线具有良好的全向特性.该天线在WLAN、Wimax、ZigBee、Bluetooth等无线通信系统中具有一定的应用价值.

A novel compact frequency reconfigurable microstrip antenna is proposed.The proposed antenna with the dimension of 30 × mm× 35 mm × 1.6 mm consists of an inverted-L microstrip feed line,five rectangular patches with different structure size and a stepped ground plane.By controlling the states of the switches and selecting the radiating elements to be connected to the feed line,the different current distributions are formed and the corresponding operating frequencies are obtained.The proposed antenna offers ten effective operation modes.The ten operation modes of the antenna can cover five operating frequency-bands of 1.89～1.92 GHz,2.16～2.32 GHz,2.39～2.91 GHz,3.30～3.69 GHz and 5.05～5.85 GHz.All modes have nearly omnidirectional radiating characteristics.The simulated and measured results are in a good agreement.The antenna may be applied in the wireless communication systems of WLAN,WiMAX,Zigbee and Bluetooth.