Research papers

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…

A waveguide polarizer with resonant notches in a septum is investigated. The Wiener-Hopf technique is employed to derive theoretical design data and the results are compared to experiments for a single-notch and a double-notch design. It is concluded that the…

The caustics for the singly diffracted rays from a circular disk are investigated when the rays emanate from a source which is placed off the axis of the disk. Either two or four singly diffracted rays appear dependent on the…