Analysis of offset circular reflector antenna with a large aperture by complex source-dual series approach

Reflector antennas are very popular part of modern communication systems. Especially, large reflectors are important for point to point communication. Reflectors generally have a parabolic shape but spherical or circular shapes can also be used in scanning systems. Our interest is offset circular reflector with a directive feed. The offset reflectors have no aperture blockage and have asymmetrically shape main beam in one plane and in another perpendicular plane the beamwidth is very small. Therefore, as an example, these kind of offset circular reflectors have usage in navigational systems to scan the Earth from a aeroplane. In this study, the 2D offset circular reflector antenna is solved with an exact analytical-numerical technique with a guaranteed convergence and accuracy for all observation positions. For the same geometry, a physical optics (PO) solution is also generated and some comparisons are made with the exact solution. The exact and PO results are both obtained for E-polarization.