随着无线通信系统向着小型化、紧凑化方向发展，迫切要求发展电小天线及阵列技术。然而，受限于经典天线理论Chu极限，同时实现电小天线及阵列的宽带化、高效率、以及高方向性，已成为业界亟待解决的历史性难题。本项目旨在以近年来流行的非福斯特（non-Foster，NF）技术为手段，系统深入地研究实现高性能电小天线及超方向性阵列的基础理论、有效途径与关键技术。首先，借助于NF电路独特电抗优势，探索低Q电小天线设计理论与技术；同时，研究紧凑电小阵列近场耦合机制，并建立半解析耦合模型；进而，将NF电路逐步融入紧凑阵列中进行系统级研究，以实现兼顾低Q与超方向性优势的电小阵列设计；然后，评估NF天线系统辐射性能与稳定性间的制约关系；最终，有机集成上述成果，完善NF电小天线系统最优化设计方案并完成原理性实验验证。项目研究将为突破Chu极限的有源电小天线及阵列设计提供完整而高效的设计思路、理论支撑及方案体系。

With the development of wireless communication systems toward miniaturization and compact configuration, the improvement of electrically small antenna and array technologies is in urgent requirement. However, limited by the classical antenna theory "Chu limit", the realization of electrically small antenna and array with broadband, high efficiency, and high-directivity radiation at the same time, has become a historical problem in the industry. This project aims to study the basic theories, effective approaches, and key technologies to realize the high-performance electrically small antennas and super-directivity arrays, by means of the non-Foster (NF) technology which is popular in recent years. First of all, with the aid of the unique NF circuit reactance advantage, the low Q electrically small antenna theories and technologies are explored; At the same time, the near-field coupling mechanism of high-density electrically small array is investgdated, and semi-analytical coupling model is builded accordingly; Secondly, the NF circuits are incorporated into the high-density electrically small array design gradually and the system level studies are carried out, so as to accomplish the electrically small array deisgn with both broadband and super-directivity radiation; Thirdly, the tradeoff between the NF antenna/array radiation performance and system stability is evaluated; Finally, the design optimization scheme for the NF electrically small antenna system is improved by organically compounding the above research results, and the academical experimental verification is accoplished. This project research will provide a complete and efficient design idea, a strong theory support, as well as a scheme architecture, for the active electrically small antenna and array designs with the performances beyond the Chu limit.