考虑互耦的半波振子线阵辐射和散射方向图综合

对于半波振子阵列天线,可用感应电动势法算得其阻抗矩阵,依据等效电路原理计入单元间的互耦计算辐射场.将其推广至考虑互耦的散射场计算,基于此辐射场和散射场的计算公式,提出一种考虑互耦同时综合半波振子阵列天线辐射和散射方向图的新方法.运用粒子群优化算法,通过优化振子的间距,同时综合指定辐射和散射方向图.运用该方法,通过对中心工作频率处的辐射和散射特性以及在威胁角度给定频带内的散射特性优化,有效降低半波振子阵在中心工作频率处的辐射和散射方向图的副瓣电平,并减小其在威胁角度给定频带内的雷达散射截面.计算结果与FEKO仿真结果吻合良好,验证方法的正确性.     

Hydrothermal Synthesis, Crystal Structure and Magnetic Properties of a Novel Zero-dimensional Manganese（Ⅱ） Complex with 2,2′-Diphenic Acid and 1,10-Phenanthroline Ligands

A novel metal-organic coordination polymer [Mn3(2,2′-dipha)3(phen)6]n·3nH2O (2,2′-dipha = 2,2′-diphenic acid, phen = 1,10-phenanthroline) 1 has been hydrothermally synthe- sized and structurally characterized by single-crystal X-ray diffraction, elemental analyses, IR spectroscopy, and magnetic susceptibility measurements. The crystal crystallizes in triclinic, space group P1 with a = 16.921(5), b = 18.307(5), c = 18.450(5) , α = 113.369(5), β = 108.529(5), γ = 102.984(5)o, V = 4553(2) 3, C114H72Mn3N12O14.25, Mr = 2002.66, Dc = 1.461 g/cm3, μ(MoKα) = 0.488 mm1, the final F(000) = 2058, Z = 2, R = 0.0491 and wR = 0.0980 for 9087 observed reflections (I > 2σ(I)). In the crystal structure, the manganese atom is six-coordinated with two carboxylate oxygen atoms from different carboxylate groups of the same dipha and four nitrogen atoms from two different phen ligands, showing a slightly distorted octahedral geometry. Fur- thermore, it exhibits a zero-dimensional structure with dipha-Mn-phen- as building units. Variable- temperature magnetic measure shows an overall anti-ferromagnetic behavior for compound 1.     

大型平面阵列天线辐射方向图的小阵外推计算和综合方法

基于子阵思想,小型阵列的单元辐射场等效大型阵列中相似环境下单元的辐射场,利用叠加定理计算大型阵的总辐射场.基于此方法和平面阵的辐射机理,提出运用小型直线阵外推计算大型平面阵辐射场的方法.有效地减小了计算量.利用此方法结合遗传算法通过优化单元的馈电幅度,综合了10×10元低副瓣微带贴片平面阵列天线,结果与HFSS仿真结果吻合良好.     

单位圆上对数权Bloch型空间复合型算子紧性条件的一种改进

设α1,u在单位圆D内解析,φ是D上的解析自映射.本文给出了D中从β_L到β_α的加权复合算子uC_φ为紧算子的简捷充要条件.     

新型二维层状配合物[Cd_4(2,2-′dipha)_2(nicotinate)_4]_n的合成及晶体结构

利用水热法合成了一种新型的二维金属有机配合物[Cd4(dpa)2(HL)4]n[dpa=2,2'-联苯二甲酸,HL=烟酸],并通过X-射线单晶衍射、元素分析、红外光谱等手段对其结构进行了表征.结果表明:[Cd4(dpa)2(HL)4]n属于三斜晶系,空间群Pi,晶胞参数α=0.822 2(2)nm,6=1.497 6(3)nni,c=1.981 7(5)nm,α=80.245(4)°,β=83.885(4)°γ=89.972(4)°,V=2.390 9(10)nm3,Z=2.R1=0.071 6.ωR2=0.157 3,Mr=1 415.39.Dc=1.966 g/cm3.配合物中Cd(Ⅱ)均为六配位,CA与5个O原子和1个烟酸中的H原子配位形成扭曲八面体构型.金属离子Cd(Ⅱ)由联苯酸连成一条无限一维链,相邻的两条链由烟酸连接构成二维层状结构.