Systematic approach to control feed scattering and multiple reflections in symmetrical primary-fed reflector antennas

Fast and Accurate Analysis of Reflector Antennas With Phased Array Feeds Including Multiple Reflections Between Feed and Reflector

“…However, it has been shown that the PO radiated field for on-axis beams can be approximated rather accurately through a single plane wave (PW) field [10], [37]. This observation opts for employing a Plane Wave Spectrum (PWS) to speed up the field computations [38]- [40].…”

“…Conversely, if only the dominant on-axis PW term is used to approximate the reflector field, the error increases when the plane P becomes larger. This is due to the tapering of the reflector scattered field which becomes more pronounced when the plane size P increases, so that the PW amplitude A(k x , k y ) is underestimated when using the field averaging in (17a) for k x = k y = 0, as opposed to the direct on-axis point sampling method that has been presented in [10]. Note that the magnitude of the co-polarized spatial frequency spectrum |A co (k x , k y )| in Figs.…”

“…The characterization of feeds in unblocked reflectors and on-axis beams can be handled by the traditional spillover, illumination, polarization and phase subefficiency factors defined for rotationally symmetric reflectors in [7], and be extended to include excitation-dependent decoupling efficiencies of PAFs [8], [9]. The present paper investigates the effects of aperture blockage and multiple reflections on the system performance in a more generic fashion than in [10] and [11] for rotationally symmetric antennas.…”

“…For example, in [10] the multiscattered field is approximated by a geometric series of on-axis plane wave (PW) field scattered by the antenna feed due to an incident PW at each iteration, where the amplitudes of these PWs are expressed analytically for a given reflector geometry. This method is very fast and insightful, while MoM-level accuracy can be achieved for single-horn feeds, but not for array feeds as demonstrated in this paper.…”

Design and Optimization of a Compact Wideband Hat-Fed Reflector Antenna for Satellite Communications

“…These multiple reflections were described in [23] and analyzed further in [24] with an approach based on the moment method. In [25], a feed scattering pattern was introduced, where the scattered field from the feed when illuminated by a plane wave may have a strong effect on the performance.…”