Design procedure of aperture coupled stacked patch antenna??

Help needed...

Are there any good reference for the design procedure of aperture coupled stacked patch antenna? There seems to be many articles about the example of stacked patch antenna with wide bandwidth, but without any initial design procedure for that.....

Now I am going to design a stacked patch antenna at 2GHz with 10~20% bandwidth, but I don't know how to start.... Any information will be appreciated...

Why don't you look in the book Microstrip antennas Handbook, I think you will find several examples on patch antennas design