探讨矢势多极展开一阶项对应的辐射场  

Discuss the Radiation Field Corresponding to the First-order Term of the Vector Potential Multipole Expansion

作　　者：朱孟正[1] 赵春然[1] 公丕锋[1] 张金锋[1] ZHU Mengzheng;ZHAO Churan;GONG Pifeng;ZHANG Jinfeng(School of Physics and Electronic Information,Huaibei Normal University,Huaibei 235000,China)

机构地区：[1]淮北师范大学物理与电子信息学院,安徽淮北235000

出　　处：《牡丹江师范学院学报（自然科学版）》2022年第2期46-49,70,共5页Journal of Mudanjiang Normal University：Natural Sciences Edition

基　　金：国家自然科学基金项目(51502106);安徽省自然科学基金面上项目(1808085MA08);安徽省高等学校质量工程项目(2020rcsfjd35,2020SJJXSFK2160);淮北师范大学质量工程项目(2020xylkc004)。

摘　　要：当辐射源体系的电偶极矩为零时,矢势多极展开的零阶项对应的电偶极辐射为零,需要考虑矢势展开的一阶项.在小场源近似条件情况下,此项即成为矢势的主要项,该项对应着磁偶极辐射和电四极辐射,这两种辐射的强度是同量级的;当计算体系总的辐射能流、功率或角分布等涉及二次运算时,其中就会有交叉项的贡献,不能简单的将磁偶极、电四极辐射单独存在的贡献直接相加.When the electric dipole moment of the radiation source system is zero,the electric dipole radiation corresponding to the zero-order term of the vector potential multipole expansion is zero,and the first-order term of the vector potential expansion needs to be considered.In the case of a small field source approximation,this term becomes the main term of the vector potential.This term corresponds to magnetic dipole radiation and electric quadrupole radiation,and the intensity of these two types of radiation is of the same order.When the calculation of the total radiant energy flow,power,or angular distribution of radiation involves secondary calculations,there will be cross-term contributions.The contributions of the magnetic dipole and electric quadrupole radiation alone cannot be simply added directly.

关 键 词：多级展开 磁偶极辐射 电四极辐射 

分 类 号：O442[理学—电磁学]