Abstract
ABSTRACT In this paper, the authors propose a two-layer microstrip matched feed for a compact offset reflector with projected diameter equal to 10λ, operating at 3.5 GHz (sub-6 GHz 5G band). The proposed feed consists of a rectangular patch operating in dominant mode at the top layer and a circular patch operating in TM mode below it. Both the microstrip patches are excited using two different ports and the excitation ratio between the two ports is varied to obtain the conjugate field matching required for cross-polar suppression in the reflector pattern. The optimum excitation ratio between the two generated modes are obtained through a parametric study for three different F/D (focal length to diameter) values of 0.4, 0.6 and 0.8. The proposed matched feed is a low cost feed designed on FR4 substrate and its pattern is obtained using HFSS and CST. The reflector pattern of the offset reflector is calculated using geometrical optics technique and verified in HFSS-PO. The cross-polarization in the reflector pattern obtained using both the geometrical optics and HFSS-PO are better than dB for an offset reflector with . The characteristics of the proposed matched feed are verified by comparing the simulation and the measured results of a fabricated prototype.
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