Re: Need a help to simulate a reflector for monopole antenna
Well, from the picture you posted it seems like you are using a patch antenna instead of monopoles, so I'm not sure if my comment is appropriate.
However, I do not understand why your teacher says there are manufacturing difficulties with using parasitic wires. Yagi-Uda type antennas are/were one of the most popular types of antennas in existence. Where I live, there is one on top of almost every single house and building around, so I think there are no big manufacturing problems. As for getting a good result, these type of antennas are covered in numerous antenna books, so you can easily find some design suggestions for improving your results.
John