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本文讨论两种天线罩设计技术的最新进展。首先讨论可以降低A型夹层天线罩最大象差的三种方法,罩形可以是高细度比的圆锥形或椭球形。未修正的椭球A型夹层罩象差的计算值与用三种修正法修正的同型罩的相应数值进行了比较。所研究的三种修正方法是:特殊导线修正法,控制天线罩夹芯各向异性的方向性和利用人造介质增大罩芯的介电常数。三种修正法都表明,它们可以将峰值象差降低50%。其次讨论了降低强化塑料天线罩的性能随温度变化的方法。叙述了用各种强化布的两种聚酯树脂构成的强化天线罩材料。给出了在Ⅰ(Ⅹ)波段从20℃到175℃范围内介电常数和损耗角的测量值。为说明在此温度范围内介电常数和损耗角变化的情况,给出了Ⅰ(Ⅹ)波段半波天线罩结构的计算带宽。
This article discusses the latest advances in two radome design techniques. First of all, three methods to reduce the maximum aberration of the A-type sandwich radome are discussed. The mask shape may be a conical or ellipsoidal shape with a high fineness ratio. The calculated value of the uncorrected ellipsoid type A sandwich mask aberration was compared with the corresponding values of the same type mask modified with the three correction methods. The three correction methods studied are: special wire correction method, controlling the directivity of sandwich antenna anisotropy and using artificial medium to increase the dielectric constant of core. All three correction methods show that they can reduce the peak aberration by 50%. Second, the method of reducing the performance of a reinforced plastic radome with temperature is discussed. A reinforced radome material composed of two types of polyester resins of various reinforcing cloths is described. The measured values of dielectric constant and loss angle in the range of 20 ° C to 175 ° C in the I (X) band are given. To illustrate the variation of the dielectric constant and the dissipation angle in this temperature range, the calculated bandwidth of the half-wave radome for the I (Ⅹ) band is given.