This paper presents a design of dual-frequency antenna applied in GPS (1.575 GHz) and WLAN (2.45 GHz). The antenna adopts a structure of nested inside and outside square patch. The inside smaller square patch operates at the high frequency and outside square patch operates at the low frequency. By slotting a rectangular slot in inside square patch, it reduces the high resonance frequency, then it realizes 1.55 times of the frequency ration. The outside patch realizes right-handed circular polarization (RHCP) through cutting comers .While inside patch cuts different sizes of triangle perturbation units to compensates the asymmetry of the current paths caused by the slot , then it can realize impedance matching at the high resonance frequency. The antenna has the advantage of high gain, miniaturization, and ease of manufacture.%提出了一种适用于GPS(1.575 GHz)和WLAN(2.45 GHz)工作的双频天线设计.该天线采用相互嵌套的内外方形贴片结构,其中内、外贴片分别对应高端谐振频率点、低端谐振频率点.在内贴片上开尺寸较大的矩形槽,降低高端谐振频率,从而实现了1.55倍的频率比.外贴片采用切角的方法实现右旋圆极化(RHCP),在内贴片对角位置切去两个大小不同的三角形微扰元,用以补偿开槽给内贴片上电流路径带来的不对称性,实现了高端谐振频率点处的阻抗匹配.该天线具有增益高、小型化、易于制造等优点.
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