In contrast to existing antennas with polarization and directional characteristics, we propose a novel isotropic antenna that provides equivalent vertical and horizontal polarization in all directions. The final design was guided by simulations, with the performance characteristics of the fabricated antenna verified experimentally. In the proposed antenna, two λ/4 folded microstrip antennas were integrated into one antenna in a “+” shape to generate the isotropic radiation pattern, with the input impedance matched to the feeding position. The resonant frequency, horizontal width, radiation pattern, and axis ratio were adjusted by changing the length of the microstrip line. Both simulations and experiments confirmed that the radiation patterns of vertical and horizontal polarization on each plane show the characteristics of an isotropic antenna with nondirectional radiation pattern.

中文翻译：

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具有各向同性辐射图的折叠微带天线

与具有极化和方向特性的现有天线相比，我们提出了一种新颖的各向同性天线，可在所有方向上提供等效的垂直和水平极化。最终设计以仿真为指导，并通过实验验证了所制造天线的性能特征。在建议的天线中，两个λ/4折叠微带天线以“+”形集成到一个天线中以生成各向同性辐射图，输入阻抗与馈电位置匹配。通过改变微带线的长度来调整谐振频率、水平宽度、辐射方向图和轴比。仿真和实验都证实，每个平面上垂直和水平极化的辐射方向图显示出具有无方向性辐射方向图的各向同性天线的特性。