The use of dielectric super-layers for shaping the radiation pattern of focal plane feeds of a multibeam reflector system is discussed. Using the super-layers, it is possible to reduce the spillover from the reflectors without increasing the dimension of each aperture. The effect has been demonstrated using a realistic array configuration. The experimental demonstration is obtained with configurations which are typical for satellite based multi beam telecommunication links. Thanks to the adoption of a × 4 reuse scheme, based on frequency and polarization orthogonal channels, the measured edge of coverage directivity has improved, with respect to a standard technology case, by 2 dB over an operational bandwidth of about 2%.
Neto, A., Ettorre, M., Gerini, G., & de Maagt, P. J. I. (2012). Leaky wave enhanced feeds for multibeam reflectors to be used for telecom satellite based links. IEEE Transactions on Antennas and Propagation, 60(1), 110-120. https://doi.org/10.1109/TAP.2011.2167909