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随着空间电磁信号越来越密集,电磁环境尤其是战场电磁环境变得更加复杂化,对各种通信设备和武器装备构成了威胁。以无线方式传播的微波信号遭到了严重的干扰和压制,通信系统的距离大为缩短、性能急剧下降甚至无法实现通信。针对日益复杂的电磁环境,人们利用光纤的巨大带宽和天生的抗电磁干扰优势,采用光子学的方法产生、传输和处理微波信号,从而开辟了一个崭新的研究领域即微波光子学,微波光子滤波器是其重要的应用领域之一。在复杂电磁环境下,通过微波光子滤波器技术对微波信号进行处理可获得优越的性能,因而在军事通信中获得了广泛的应用。文中对微波光子滤波器的基本概念、结构原理、关键技术与实现方法进行了详细和深入的介绍,并探讨了其在复杂电磁环境下的应用。
As space electromagnetic signals become more and more intensive, the electromagnetic environment, especially the battlefield electromagnetic environment, becomes more complicated, posing a threat to various communications equipment and weapons and equipment. The microwave signals propagating in a wireless way have been seriously disturbed and suppressed, the distance of the communication system is greatly shortened, the performance is drastically reduced or even unable to be communicated. In response to the increasingly complex electromagnetic environment, people take advantage of the huge bandwidth of optical fiber and innate anti-electromagnetic interference to produce, transmit and process microwave signals by means of photonics, thus opening up a brand new research field of microwave photonics, microwave photonic filtering It is one of the important application areas. In the complex electromagnetic environment, through the microwave photonic filter technology for microwave signal processing can obtain superior performance, and thus has been widely used in military communications. In this paper, the basic concepts, structure principle, key technologies and implementation methods of microwave photonic filters are introduced in detail and in depth, and their applications in complex electromagnetic environment are discussed.