中文摘要：

提出了一种新型的差分双频缝隙天线，通过接地板上刻蚀弯折缝隙的方法实现双频谐振。天线整体尺寸为60mm×60mm（0．3621×0．362λ1，λ1，为天线低频段的导波波长）。为了改善天线低频段的增益和辐射特性，设计了一种新型的双频段左手材料，并作为天线的覆层。结果表明，覆层左手材料的差分双频缝隙天线的工作频段为0．9GHz和2．4GHz，低频段和高频段的增益分别为1．2dBi和6．3dBi。

英文摘要：

A differential dual-band slot antenna is mentioned in this paper. Dual bands are realized using meander slots in the ground plane. Compared with the conventional half-wavelength antenna, the proposed antenna has a compact size of 60 mm × 60 rnm （0. 36 λ1 × 0. 36 ,λ1, λ1 is the guided wavelength at the low frequency）. In order to improve the gain and radiation characteristic of the low frequency, a novel periodic structure of double frequency lefthanded materials （LHMs） is designed to cover the antenna. The results show that the gain of two bands is 1.2 dBi and 6.3 dBi.