针对多频天线结构复杂,天线尺寸较大,设计了一款紧凑型结构的三频单极性微带贴片天线。该天线的辐射单元由双C型结构和加载倒L型结构构成,利用低频段的高次模,从而产生天线的高频段。该方法可以有效实现多频特性,并能够有效地减小天线尺寸。天线尺寸仅为20×31×1.6 mm3。实测频段为2.40~2.50 GHz,3.17~3.90 GHz,4.67~5.83 GHz。该天线具有体积小,结构简单,辐射特性良好的优点,实现了对3.5/5.5 GHz WIMAX频段和2.4/5.2/5.8 GHz WLAN频段的全覆盖,能够很好的适用于无线通信系统的应用。%This paper proposed a compact structure of tri-band microstrip antenna in order to solve the problems complex structure and the larger size of multi-frequency antenna.The antenna was composed by the two C-ring structures with a pair of inverted L-shaped stubs.Besides,this design utilized high-order mode to generate high frequency.This method could effectively achieve multi-frequency characteristics and reduced the antenna size. The experimental results showed that the antenna had the impedance bandwidths of 100MHz (2.40-2.50 GHz), 730MHz (3.17-3.90 GHz)and 1160 MHz (4.67-5.83 GHz),which could cover both WLAN in the 2.4/5.2/5.8 GHz bands and WIMAX in the 3.5/5.5 GHz bands.
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