help : a Ku-band(about 15GHZ) microstrip antenna design

help a Ku-band(about 15GHZ) microstrip antenna design

hi friends

i want to design a Ku-band(working frency about 15GHZ) microstrip antenna .
the first problem is how to chooce the dielect Er(about 2.2 or higher such as 10.2),second is the substrate thickness(i want to use 1.0mm).now,i think useing Er=2.2 and thickness 1.0mm is good. anybody agree with me? if not, i wish experts or my friends to give me advice
best regard
thanks