Research papers

A new antenna diagnostics technique for spherical near-field antenna measurements, that is able to provide a high resolution of the reconstructed aperture field in excess of existing techniques, is presented. This is realized by using a transformation from the spherical…

This paper presents a new hierarchical basis of arbitrary order for integral equations solved with the method of moments (MoM). The basis is derived from orthogonal Legendre polynomials which are modified to impose continuity of vector quantities between neighboring elements…

Since the early days of spherical near-field far-field transformations a recommendation for the necessary number of polar modes has been given by N = kro + 10, being the wavenumber and r the radius of the minimum sphere. The almost…

A direct approach to the design of a multi-focal antenna system for the reception from several satellites along the orbital arc is presented. The method is based on optimising the reflector shape until a desired far-field performance, as calculated by…

The new light-weight reflector antenna technology being used by several spacecraft companies requires accurate electromagnetic modelling of the reflector surface properties. In particular, the new tri-axially woven carbon fibre skins are of interest. Publication: 2003 IEEE AP-S Symposium Place: Columbus,…