Based On Moems Optical Switch Fiber Real-time Delay Line Design And Implementation Method Of Research

The conventional phased array radar has many advantages, but due to the limitation of the aperture fill time, it can only work in a relatively narrow bandwidth, which limits its applications in the field of wide-band and ultra-wide-band. In recent years optically controlled phased array becomes a hot spot in the research of radar technology. It uses the method of optical time-delay to offset the aperture fill time, so that it can be used in wide-band even ultra-wide-band radar beam forming and processing. Compared to the conventional phased array radar, optically controlled phased array radar has a lot of advantages, such as high precision beam scanning, large operating bandwidth, immunity to electromagnetic interference and so on. Optical time-delay technology is the core and key of the optically controlled phased array radar. This paper mainly studies the true-time-delay line technology based on MOEMS optical switch and its realization method.Firstly this paper briefly introduces the basic principles of phased array antenna and analysis the problem which happens when the conventional phased array antenna realize the broadband and wide-angle beam scanning. Next this paper studies the basic principles of the optically controlled phased array antenna and an optically controlled phased array antenna system model using the method of sub-array-time-delay plus unit phase shift is proposed. Then the model parameters and the optimization problem of sub-array dividing for the realization of wideband and wide-angel beam scanning are studied through theoretical analysis and simulation tools. Next an optical fiber true-time-delay line structure based on the8×8MOEMS optical switch is proposed according to the optically controlled phased array antenna system model, and the realization method of the delay line is studied. The method has been verified through simulation research. The result confirms that the system can realize the antenna beam discrete scanning of128angles in±60°. In order to realize the continuous scanning of the antenna beam, a new optically controlled phased array antenna system model is proposed and a new delay line structure based on2×2MOEMS optical switch is designed for the new antenna system model. The feasibility of this scheme is proved through the simulation, and the system achieves a continuous scanning of the antenna beam in±60°. Finally, the two antenna system models upside are compared and analyzed.