Frequency Domain Interpolation for Filtering the Undesired Coupling Effect in the NF Antenna Characterization Setup

Multiple reflection effect between the antenna under test and probe in a near field measurement scenario is investigated and the direct portion of the transmission coefficient is extracted by applying the linear interpolation to the sampled data in the frequency domain. The obtained results are compared to a reference in terms of transmission coefficient and radiation pattern. It is shown that by utilizing this technique, the accuracy of the computed radiation pattern can be improved in different observation angles.