In this letter, a dual band circularly polarized (CP) meta‐structured antenna is designed by −1 mode for L1 band and mu‐zero resonance mode for L2 band, respectively. The antenna consists of two kinds of unit cells which have four unit elements for −1 mode and mu‐zero resonance mode, respectively, in order to utilize the limited space efficiently, and to maximize the gain. Since two modes of −1 mode and mu‐zero resonance mode operate like as loop antenna, these are fed by magnetic coupling of an aperture, simultaneously. In order to reduce mutual coupling between two modes, the orientation of −1 mode antennas are tilted by 45° from that of MZR mode antennas. In this arrangement, magnetic fields with two directions are needed to excite all unit elements, simultaneously. Thus, a cross shaped asymmetric aperture is employed. The RHCP gain of the antenna is measured to be 0.59 dBic at L1 band and −0.02 dBic at L2 band, respectively. The size of the antenna is only 0.14 λ₀ by 0.14 λ₀ (kr_ground = 1.28) at L2 band. The measured results show a good agreement with those of simulations.

中文翻译：

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紧凑的GPS双频圆极化元结构天线

在这封信中，分别针对L1频段的-1模式和针对L2频段的mu-0谐振模式设计了双频段圆极化（CP）元结构天线。天线由两种单位单元组成，分别具有针对-1模式和mu-0共振模式的四个单位元素，以便有效利用有限的空间并最大化增益。由于-1模式和mu-0共振模式这两种模式的工作方式就像环形天线一样，因此会同时通过孔的磁耦合馈电。为了减少两种模式之间的相互耦合，-1模式天线的方向与MZR模式天线的方向倾斜45°。在这种布置中，需要具有两个方向的磁场以同时激发所有单元元件。因此，采用十字形的不对称孔。天线的RHCP增益在L1频段测量为0.59 dBic，在L2频段测量为-0.02 dBic。天线尺寸只有0.14λ ₀ 0.14 λ ₀（KR_地在L2波段= 1.28）。测量结果与仿真结果吻合良好。