应用于无线局域网的低剖面宽带双频微带天线的设计

Design of a wideband dual-frequency microstrip antenna with low profile for WLAN applications

提出一种应用于无线局域网(WLAN)的低剖面单馈双频宽带微带天线.该天线辐射贴片由三个矩形连接桥连接内外两块辐射贴片构成,并在U型外贴片上加载一根短路探针,通过加载连接桥和短路探针拓展天线的工作带宽.微带天线介质基片由上下两层FR4介质板和中间空气层组成,剖面高度为0.042λ.测试结果表明,天线回波损耗大于10 d B的工作带宽分别为2.39~2.50 GHz和5.02~5.87 GHz,在两频段中心频率2.45和5.5 GHz时增益分别为6.14和8.82 d Bi.该天线剖面低,增益高,能够完全覆盖IEEE 802.11a/b/n/ac标准所规定的工作频段,具有较好的工程应用价值.

A single-feed,dual-frequency and wideband microstrip antenna with low profile is proposed for wireless local area network（ WLAN） applications. The radiation patch of the proposed antenna is composed of two metal patches linked by three rectangular bridges. A shorted probe is inserted between the outer U-shaped patch and the ground,and the working bandwidth is broadened by the combination of the linked bridges and the shorted probe. The substrate of the proposed antenna with profile of 0.042λ consists of two FR4 substrates and an air layer in the middle,where λ is the free-space wavelength at 2.45 GHz. The measured results show that the operating bandwidths with S1110 d B are 2.39-2.50 GHz and 5.02-5.87 GHz,respectively. A desirable directional radiation pattern with the antenna gain of near 6.14 d Bi at 2.45 GHz and 8.82 d Bi at 5.5 GHz is obtained. The proposed antenna which can cover the whole IEEE 802.11 a/b/n/ac operating bandwidths features a low-profile and high gain and has a good applied potential in engineering.