Comparison of the Performance of Corrugated, Smooth-Walled and Diagonal Horns at 500GHz

There are many types of feed horns which can be used to couple a free-space beam into a waveguide. Here we simulated the performances of three kinds of feed horns, corrugated horn, smooth-walled horn and diagonal horn. The calculation results at 500 GHz show that the corrugated horn has the best performance, but is relatively difficult to fabricate. On the other hand, as the best choice, the smooth-walled horn has the quite good performance and is the easiest one to manufacture. Detailed simulation results are presented.