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雷达中用得最普遍的线性调频声表面波器件一般都是采用共线型换能器结构,这类器件在时域上有菲涅尔波纹和指间反射,如果不加以补偿,势必使压缩脉冲的旁瓣恶化.本文介绍倾斜型换能器和倾斜型反射阵列结构,它们能使指间反射和菲涅尔波纹减到最小.利用倾斜换能器结构制作的宽带铌酸锂器件和窄带石英器件,都可以得到平坦的功率响应,倾斜阵列的加权也很容易实现.制作在铌酸锣上的一对匹配了的脉压线得到了—37分贝的时间旁瓣.本文介绍了铌酸锂和石英倾斜换能器的等效电路模型.导出了换能器孔径的设计方程式,还提出了倾斜反射阵列相关器的设计以及第一个这种器件的实验结果.
Radars used in the most common LFM SAW devices are generally the use of collinear transducer structure, such devices in the time domain Fresnel ripple and inter-fingered reflection, if not to be compensated, is bound to make compressed Pulse sidelobe deterioration.This paper describes the tilt-type transducer and tilt-type reflective array structure, which can make the inter-finger reflection and Fresnel wave minimization.Using the structure of the tilt transducer made of lithium niobate broadband devices and narrowband Quartz devices, can get a flat power response, tilt array weighting is also very easy to achieve.Prepared in the niobium gong on a match on the pulse pressure line has -37 dB sidelobe time.This article describes the niobate The equivalent circuit model of lithium and quartz tilt transducers is derived.The design equations for the transducer aperture are derived, the design of the tilted-reflection array correlator and the experimental results of the first such device are also presented.