Complex-Point Dipole Formulation of Probe-Corrected Cylindrical and Spherical Near-Field Scanning of Electromagnetic Fields
Complex-Point Dipole Formulation of Probe-Corrected Cylindrical and Spherical Near-Field Scanning of Electromagnetic Fields
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探针校正圆柱形和球形电磁场近场扫描的复点偶极子公式
DOI：
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发表时间：
2009
影响因子：
5.7
通讯作者：
T. Hansen
中科院分区：
文献类型：
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作者：
T. Hansen
提出了一种基于复点偶极子的探针校正电磁理论，用于计算有限范围任意源（例如测试天线）在圆柱形或球形扫描表面上的近场测量。通过用复数点偶极子表示探针，探针校正是通过简单的因素来实现的，这些因素涉及在复数点上评估的汉克尔函数。在近场测量中，只需要四个复点偶极子来表示一个典型的精密探头。该理论既不使用平移和旋转定理，也不使用微分算子。该理论的一个缺点是它采用非线性优化来确定探针模型的参数。探针的复数点偶极子表示使得近场扫描系统的真实模拟变得简单明了。通过数值算例验证了圆柱理论的正确性。实验数据验证了球面理论的正确性。
A probe-corrected electromagnetic theory based on complex-point dipoles is presented for computing the field of an arbitrary source of finite extent (for example a test antenna) from measurements of its near field on a cylindrical or spherical scanning surface. By representing the probe with complex-point dipoles, probe correction is achieved by simple factors that involve Hankel functions evaluated at complex points. Only four complex-point dipoles are needed to represent a typical precision probe used in near-field measurements. The theory uses neither translation and rotation theorems nor differential operators. One disadvantage of the theory is that it employs nonlinear optimization to determine the parameters of the probe model. The complex-point dipole representation of the probe makes realistic simulations of near-field scanning systems straightforward. The cylindrical theory is validated through a numerical example. The spherical theory is validated by experimental data.