Abstract-A fast spherical near-field to far-field transformation using single cuts is introduced in this paper. It is based on calculating the Cylindrical Modal Coefficients of each individual near-field ring and processing them independently, considering them as cylinders of zero height and applying probe correction. The reconstruction of each far-field cut is obtained through an inverse Fast Fourier Transform. This procedure provides the opportunity to perform real time transformations due to its low acquisition and processing time. It is a useful tool for applications which do not require a full or accurate characterization, such as measuring the main patterns of an antenna or its most important parameters (peak gain, beam width, side lobe level, etc.).
Abstract-A source reconstruction technique for slot array antennas is presented. By exploiting the information about the positions and the polarizations of slots to the Gerchberg-Papoulis iterative algorithm, the field on the slots is accurately reconstructed. The proposed technique is applied to the source reconstruction of a K-band radial line slot antenna (RLSA), and the simulated and measured results are presented.
A new design algorithm for Radial Line Slot Antennas with circular polarization and an arbitrary shaped pattern is proposed in this paper. It is based on an optimization scheme that takes into account the antenna geometry and makes use of a fast method of moments (MoM) analysis tool. The slot lengths and layout that minimize the error between the target radiation pattern and the achieved one are calculated. This procedure is a useful tool to design pencil beam antennas with controlled side lobe level or isoflux satellite antennas for MEO or LEO applications. Two examples are presented to verify the validity of the approach.
A method to reconstruct the field distribution on slot array antennas is presented. The field on each slot is reconstructed with high spatial resolution by extrapolating the invisible region of the plane wave spectrum (PWS) using the Gerchberg-Papoulis (G-P) algorithm. The information of the slot positions, angles, and lengths is exploited in the G-P algorithm to enhance the accuracy and resolution of the reconstructed field. The proposed algorithm is validated through the source reconstruction of a Kband radial line slot antenna (RLSA) from the near field on planar and spherical scanning surfaces.Index Terms-Gerchberg-Papoulis algorithm, near-field antenna measurements, slot array antennas, source reconstruction.
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