Corrugated feeds from ASYSOL are based on open-ended circular waveguide, with several frontal corrugations. As a result of optimised design and high-precision manufacturing, the feeds possess rotationally symmetric radiation patterns with low back radiation and very low cross-polarisation. In standard single-polarisation configuration, the feeds are provided with integrated waveguide-to-coax adapters with SMA or K connectors. In dual-polarisation configuration, the feeds are provided with Ortho-Mode Transducers with very low cross-coupling. In both single-pol and dual-pol configurations, the feeds cover a standard waveguide band. Custom frequency bands are available upon request.

The feeds satisfy the requirement on the spherical modal content (μ=±1) important for spherical Near-Field measurements and thus the feeds are also used as spherical Near-Field probes. Their advantages over the usual open-ended waveguides are: better matching to the feed line, better suppression of the wall reflections, less dependent on the support structure interference, thus allowing more accurate Near-Field antenna measurements.