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YES FOR sure thereis a relation between antenna length and current period(or correspond frequency).
each antenna works under certain frequency range(named bandwidth)
you could convert this frequency to wave length by landa=c0/f formula
then since antenna is half wave it means antenna length is...
In fact you have many choice, there is some other parameters like Pattern or gain,
then you could make your antenna smaller using loads or matching circuits, by the way you will see that by making your antenna smaller, antenna efficincy, gain and bandwidth will degrade
Regards
So interesting
Great Spirit
Be care about these Hints:
Use open/add space boundary conditions;(you could increase it an see what happens[i guess program default is landa/4])
Use vacuum or air background materials
this scale of ripple could be because of program error and by the way when you use symmetric planes it gain simulation speed and causes small error. because by the way its not perfect aprox.
if my result is correct then do this:
go to solver setting windows click on special>>choose waveguide tab
then change port mode solver to Generalized and check broadband for inhomogeneous port option
then in solver setting windows check adaptive mesh refinement option.
after all of this you...
Attach your design. I guess your simulation is wrong.
Negative Resistance mean Active Element and This is impossible because CST Full-wave dose not support active elements.
I suppose you are wrong.
go to post-processing section and check s-parameter calculation>>always calculate z and y matrices.
then look at z folder in 1d result an navigation tree.
z matrices never change with reference impedance
Actually as i said I'm not familiar with PCB design. I'm concern about PCB elements like Via's, PAD's and parts that are related to lumped elements and their effects on overall response of design.
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