本文对偏馈赋形紧缩场天线设计进行系统研究．提出一种新的偏馈双反射器天线几何光学综合的方法．该法便于理解、推导和用计算机作数值计算。文中提出了一种计算紧缩场交叉极化的新技术。经深入分析，得出了若干具有普遍性的结论。讨论了赋形紧缩场工程设计中的一个重要问题──交叉极化与绕射效应间的矛盾，并由此阐明了布局优化的重要性。 This article systematically studies the antenna design of the bias-fed shaping tight field. A new method of geometrical optics synthesis for biased reflector antenna is proposed. The law is easy to understand, derive and use a computer for numerical calculations. In this paper, a new technique for calculating the cross-polarization of the crushing field is proposed. After thorough analysis, a number of conclusions have been drawn. An important problem in the engineering design of conformal compacting field is discussed - the contradiction between cross polarization and diffraction effect, and the importance of layout optimization is clarified.