Efficient Calculation of the Radiation by an Electrically Large Slot in a Rectangular Cavity

This work applies a new efficient method to calculate the scattering of electrical large structures on the subject of the radiation of an electrically large slot in a rectangular cavity, excited by an electrically large antenna in the internal region. Due to the method only the antenna and the slot need to be discretized into small elements, which are then represented as electrically small dipole moments, which radiate in the respective region. Once the equivalent dipole moments are known, the generated fields can easily and efficiently be calculated everywhere. The method and the results are validated with the method of moments for the internal and external region and very good agreement can be noted.