Often, significant filtering requirements exist for planar and drop-in receiver filters at IF frequencies in the 1 to 4 GHz frequency range of typically 3 to 7x fIF (centre frequency) to comply with spurious emission requirements and suppression of spurious outputs.
Bandwidth, frequency and power reconfigurable payload architectures are currently under development by major satellite manufacturers. Today's fixed bandwidth filters are a major bottleneck in such systems and have led to the implementation of reconfigurable filters. These new reconfiguration scenarios require flexible converters and, hence, flexible filters to be accommodated after the down/up conversion
Several dual-optics antenna architectures with polarisation sensitive screens in linear polarisation (LP) have been developed and the concept has been proven to perform well in LP.
Parabolic reflector antennas are widely used in satellite communications, tracking radars, as well as other similar applications.
Increasingly complex coding and modulation schemes are being applied as means to enhance spectral efficiency. Coupled with the requirement for low-cost and environmentally friendly communications, the aspect of signal amplification becomes entangled with the actual spectral content of the system.