Hello bigboss,
I am using substrate with dielectric coefficient of 2.23 in my design. Let say i took into account the dielectric coefficient, the radius should be around 17mm. Using this radius, my design resonate even further away from 1.8Ghz. I did try to play around with the radius and found that my radius should be around 40mm so that it will resonate at 1.8GHz which is way too big as compared to what i got from eigenmode solution. I really want to know what wen wrong with it.
Please help
Thanks!