Papers

Papers

01
Feb
1987

The spherical near-field geometrical theory of diffraction (SNFGTD) method is an extended aperture method by which the near field from an antenna is computed on a spherical surface enclosing the...

04
Nov
1986
Authors:

Reflector antenna surface distortions may be slowly varying, rapidly varying, systematic or random. Typical examples of each of these types of surface distortions are presented and their...

11
Jun
1986

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...

10
Jun
1986

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...

01
Jun
1985

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...

01
Jun
1984

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...

01
Oct
1983

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...

01
Aug
1983

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...

01
May
1977

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...

02
Oct
1975

The near-field and the far-field patterns from the high-gain S band antenna on the METEOSAT are calculated by the geometrical theory of diffraction. The far field is transformed into the near...

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