Particular mathematic analysis is made about the characteristics and modeling methods of phased array antenna , especially of the density - weighted antenna . theory analysis and simulation are made about the circular ? caliber weight , circular - tylor distribution and bayliss circular ? caliber weight 相控阵天线部分是整个雷达系统的关键环节,天线方向图仿真的准确与否直接影响到整个雷达系统仿真的准确性和精度。
Their maximum and variance of beam pointing accuracy are much smaller than the results of round - off method . deficiently , only ordinary antennas are studied here , circular array and cylindrical array , for example . farther study about complex and anomalous conformal antennas is expected 不过，本文中只对简单形式的共形阵天线，如圆形阵、圆柱面阵天线进行了分析，复杂的不规则的共形阵天线的情况还有待于进行进一步的研究。
With the development of digital technique , the function that can only be implemented by analog circuits or analog technique , now can be implemented by digital circuits or digital technique . the procedure of phased shifting in phased array radar will become a digital procedure eventually 随着数字技术的发展,原先只能用模拟电路实现或在模拟电路部分实现的功能也可以用数字电路或在数字信号处理部分实现,相控阵天线的移相过程最后可能会成为一个数字过程。
According to the reciprocal characteristic of dual - mcde reciprocal ferrite phase shifters , the antenna only requires to provide the sa : lle beams of operation between the trtinsmit and receive beams . in addition , 1he phased shifter can operate in various polarizations such as linear polarization or circular polarization , which is adiipted to the development of modern ra ( 1ar technologies 对电扫描相控阵天线来说，双模互易式铁氧体移相器的互易特性可使收、发在同一特定波束位置上工作；此外，双模互易铁氧体移相器可以在线极化、圆极化等多种极化方式下工作，适应了现代雷达技术的发展。
This thesis in combination with the actual engineering demand , analyzes and designs a horizontally polarized triangular - grid planar phased array antenna , which composed of open - ended rectangular waveguide , the main steps of analyzing and designing are as follows : 1 . at first , taking no account of mutual coupling among the array elements , classical electromagnetic theory is used to establish analyzing model for finite array , and initial value parameters of the array structure which basic satisfy the design index are got , these parameters provide reference for subsequent analyzing and design 本论文结合实际工程需要,分析和设计了一个采用水平极化方式的三角形栅格矩形波导相控阵天线,其主要步骤如下: 1 .首先,在不考虑阵列单元间互耦影响的情况下,采用经典电磁理论建立有限阵列分析模型,通过分析得到了基本满足设计指标的阵列结构参数,为后续的分析、设计提供参考。
The directivity coefficient of the phased array antenna has been generalized and discussed . according to the formulations of microstrip antenna design theory , planar and cylindrical microstrip patch cell has been analyzed . we can conclude that the cylindrical microstrip patch cell has the performance of high gain , low thickness , high resonant frequency , uniform directivity diagram , and easy fabrication on missile body , so it is a good choice 本文根据微带天线设计理论,分析了平面和柱面两种微带贴片单元,其中柱面微带贴片单元增益高、厚度小、谐振频率高、方向图均匀,且较易加工制作在弹体上,适合在相控阵天线中做共形辐射单元。
With compensation of signal ’ s time delay from different radiating element by phase shifters , phased - array antenna can control array beam easily . because there are no mechanical devices for rotating beam , the phased - array antenna system can scan everywhere in beam covered areas in millisecand by stepping the phase shifters . it improves the tracking velocity of antenna towards the object , and becomes the development trends of weapon system antennas 相控阵天线利用移相器补偿信号到达辐射单元时间的差异,从而控制波束方向;天线没有机械旋转问题,只需改变移相器的设定值,波束便可以在毫秒级内扫描其覆盖空域内的任何地方,提高了天线对目标的跟踪速度,是目前武器系统天线的发展方向。
First , based on phased array antenna ' s mono - pulse goniometry and separate coordinate technology about phase control , the antenna beam pointing error formula , caused by phase quantization error , is derived from linear array and circular array to planar array and cylindrical array 首先以单脉冲相控阵天线测角原理为基本理论出发点，利用相位控制的坐标分离技术，基于线阵、圆形阵等简单形式的相控阵天线，推导了平面阵、圆柱面阵等相控阵天线由相位量化误差引起的波束指向误差公式。
As the vital development of the millimeter wave guidance technology , phased array antennas use electrical control scanning beam , which results to faster scanning velocity , more flexible beam control and higher anti - interference ability . thus it can realize target seeking , tracing , guidance at the same time , and can work in the complex and worsening condition 作为毫米波制导技术的一个重要发展方向,相控阵制导技术中的相控阵天线是采用电控方式扫描波束,扫描速度快、波束控制灵活、抗干扰能力强等,可以同时完成目标搜索、跟踪、引导等多项功能,能工作在日益复杂和恶化的工作环境中。
The ferroelectric materials for their excellent dielectric , piezoelectric , ferroelectric , pyroelectric , electro - opticial , phonon - optic and nonlinear polarization properties have been widely applied in many fields especially in microwave tunable devices , such as phase shifter in phased array antenna , resonantor and filter etc . as far as microwave tunable dielectric materials , barium strontium titanate ( bst ) and its doped series have been investigated intensively , which have about 50 % tunability 铁电材料具有优良的介电、压电、铁电、热释电、电光、声光及非线性极化等特性，在多种领域有着广泛的用途。利用其非线性极化特性能制备微波可调元器件，如相控阵天线上的移相器，谐振器，滤波器等。
