yagi antenna design

I am currently working on the design of a microstrip yagi antenna for WLAN (2.4 GHz band). Although there have been existing designs of a printed yagi for WLAN, most of them are in the 5GHz band. Unfortunately I could not scale the sizes of the reflector, director, and the driven elements to have it work for my desired frequency range. Most of the papers did not provide any formula on how they came up with those dimensions.

Is there any link, a book, or a paper you could recommend that discusses how the dimensions of the reflector, driven and director elements are computed in a printed yagi antenna? Or is there anyone I could really really ask for help through e-mail?

Thanks.

Hello,

Designing a Yagi antenna is pretty much the same as a printed dipole antenna. The driven element is in principle a dipole and then you have to place a reflector on the back side of it and one or more director elements on the front side,depending the directivity that you want to achieve. The more the directors the more the directivity. The length of the driven element can be made around 0.5 lamda,reflector at around 0.55 lamda and directors around 0.4-0.45 lamda.Try to place the reflector in a distance of 0.25 lamda or less and the reflectos can have a distance of 0.1 lamda. Start from that point and try to optimise them. If you have any further questions you are free to ask.