Research papers

The still increasing requirements to satellite reflector antennas, in particular with respect to such parameters as cross polarisation and side lobe level, imply a demand for fast and accurate analysis methods by which the performance of the reflectors can be…

Although geometrical optics (GO) is an asymptotic theory describ­ing electromagnetic fields of infinitely high frequencies only, it has for several years constituted the foundation for synthesis of reflector antennas. While dual reflectors are usually shaped to produce a certain aperture…

Modern communications satellites are equipped with high gain re­flector antennas with contoured beams for various purposes. A con­toured beam of complex cross section is generated by exciting several feed elements simultaneously, where each feed radiates a narrow and almost circular…

The paper presents various methods for the calculation of the field reflected from a subreflector in a dual reflector antenna system. It is demonstrated that the physical-optics (PO) solution agrees well with the geometrical theory of diffraction (GTD) for the…

Two transformations for accelerating the convergence of infinite M-dimensional series are presented. They are generalizations of Shanks’ e- transformation and Levin’s one-dimensional transformations, respectively. The transformations are compared with an M-dimensional transformation by Levin in numerical examples. Publication: MATHEMATICS OF…