Abstract
Moment method approach is used to estimate the error encountered by the sensor in the near field and probe measures co-pole and cross-pole voltages at the same time. Conversely, due to several reflections between the waveguide and dipole sensor, near field values are changed. Calculations are done to analyze the absolute sampled co-pole voltage pattern and relative sampled electric field (without probe) pattern in the scan plane, and inaccuracy induced by the sensor is determined. The waveguide reflection coefficient, radiation admittance and susceptance with measuring sensor are reformed with respect to the equivalent values in the absence of the sensor in the near field.
Highlights
The problem of modeling the error induced by the near-field sensor and the impedance seen by the open-ended waveguide is extremely important in order to estimate the electromagnetic susceptibility of the waveguide
The waveguide radiator reflection coefficient and probe voltage across 50 ohms terminating impedance are determined using the known coefficients of the entire domain and pulse basis functions respectively
Moment method analysis of waveguide radiator with dipole and crossed dipole as the near field sensor are given by the authors [9] and [10]
Summary
The problem of modeling the error induced by the near-field sensor and the impedance seen by the open-ended waveguide is extremely important in order to estimate the electromagnetic susceptibility of the waveguide. Finite length, perfectly conducting crossed dipole alone measures in the near field values, this introduces error due to the multiple reflection between the radiator and dipole, scattering properties of the dipole and mutual coupling effects of the poles of the dipole. The mutual coupling effect between poles of the dipole must be determined, since the cross-polarized components are generated in the near-fields. The boundary conditions at the waveguide opening and on the axis of sensors are enforced by taking the properties of reciprocal connection and multiple reflections between transmitter and probe. Moment method analysis of waveguide radiator with dipole and crossed dipole as the near field sensor are given by the authors [9] and [10]
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