Hello,
In different articles about reflector antennae, I see the writers provide feed source taper value( for instance in the level of -10dB to -15dB).I need to know how to obtain this value for my feed source in CST.
I appreciate your response.
You need to design a feed source that has the correct polar diagram so that the taper due to the angle away from the feed centre-line (polar diagram), and the taper due to the distance to the dish (space taper) add up to the taper value you want. You do that by changing the size and phase curvature of the feed aperture. The phase curvature depends on the size and taper length of a horn, for instance. Antenna design books with chapters of horn design will describe this. If you don't want the feed and reflector in the same simulation, you can model the feed, save the near fields, and use them as the source for the reflector simulation. See Nearfield Sources.
See The Antenna Engineering Handbook, for example.
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