Papers

Papers

01
Oct
1993

The effects of reflector surface distortions for a paraboloidal pencil beam reflector antenna are well understood. The peak gain reduction is proportional to the surface error squared, whereas the...

28
Jun
1993

Spacecraft antennas with elliptical beams, low cross polarization and low side lobes can be designed systematically using Geometrical Optics (Viskum et al, 1992). By controlling the amplitude...

28
Jun
1993

The INTELSAT VIII spacecraft will carry two steerable spot beam antennas for operation in the Ku-band (10.95 - 12.75 GHz Tx; 14.0 - 14.5 GHz Rx), thereby continuing the success INTELSAT has had...

01
Dec
1989

The spectrum of creeping waves that can exist on the sur­face of a dielectric coated cylinder is determined by the poles in the Green's function for the cylinder. Accounts of the position of these...

28
Jun
1989

In order to provide flexible communications service in the K-band (10.95 GHz-12.50 GHz for transmit and 14.00-14.50 GHz for receive) INTELSAT has implemented two fully steerable spot beams on the...

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...

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