Abstract
Beam shaping is primarily performed by shaping the main reflector. An alternative way to shaping the main reflector is to shape the subreflector in a dual reflector system where mechanically movable panels can be deployed. Panels placed on the subreflector can potentially place their own signature on the antenna pattern, a topic which is investigated in this paper. To visualize and categorize generalized panel alignments as a result of panel movements, MoM and PO/PO methods are devised and applied to 2-D geometries based on TM and TE analysis. It should be noted that the panel movements on the subreflector create gaps between the panels which would also increase antenna cross polarization levels which is not addressed here due to 2-D nature of the analysis. Consequently, this study will focus on the antenna pattern characteristics and the required number of panels in conjunction with minimizing grating/sidelobe signature left by the panels displacements with gaps in axial and lateral directions. In addition, antenna gain loss is quantified based on gap sizes between the panels. Current distribution on the reflector antenna is also studied for both TM and TE polarization and several of their key features are examined based on PO/PO and MoM analysis.
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