Introduction - If you have any usage issues, please Google them yourself
In double reflector antennas feed, feed support beams and
sub-reflector especially cause distribution losses and large
blockings in antenna apertures.
In previous studies, the spillover losses due to open-ended
rectangular and circular section waveguide feed, which
had been mainly used in reflector antennas were studied
for TE11 and TE12 stimulated modes [1].