This article presents a highly miniaturized dual-band electrically small antenna (ESA) for on-demand 3.6 and 5.8 GHz wireless applications. A partial rectangle-shaped structure is printed on the back face of the dielectric material, forming the antenna's ground (GND) plane. The radiating structure of the antenna consists of a C-shaped structure and a U-shaped ring connected to it, which is printed on the dielectric material's front face. The overall dimensions of the designed antenna are 0.160λo × 0.160λo × 0.02λo at the lowest operating frequency. The proposed antenna has a ka value of 0.56 at the lowest operating frequency, which is 3.59 GHz. Thus, the proposed antenna is considered as electrically small. The characteristic mode analysis is adopted to provide a clear understanding of the antenna's resonance behavior. The antenna has been fabricated and the simulation results were validated through measurements. Good agreement between simulated and measured results was obtained. Dual-band operation at 3.62 and 5.75 GHz was achieved, according to the measured reflection coefficient. The proposed antenna offers an adequate performance in terms of gain and efficiency, based on simulation and measurement results. Because of these characteristics, the antenna is well-suited to new wireless applications.

本文介绍了一种用于按需 3.6 和 5.8 GHz 无线应用的高度小型化双频带电小型天线 (ESA)。在介电材料的背面印有部分矩形结构，形成天线的接地 (GND) 平面。天线的辐射结构由一个C形结构和一个与之相连的U形环组成，U形环印在介电材料的正面。设计天线的整体尺寸在最低工作频率下为 0.160 λ o × 0.160 λ o × 0.02 λ o 。建议的天线有一个ka在最低工作频率（即 3.59 GHz）下为 0.56。因此，所提出的天线被认为是电小的。采用特征模式分析，可以清楚地了解天线的谐振行为。天线已经制作完成，仿真结果通过测量得到验证。在模拟和测量结果之间获得了良好的一致性。根据测量的反射系数，实现了 3.62 和 5.75 GHz 的双频带操作。根据仿真和测量结果，建议的天线在增益和效率方面提供了足够的性能。由于这些特性，天线非常适合新的无线应用。