Beam steering in HFSS(a simluation problem)!!!

Hello all!

I am trying to see how a patch array (with mounted tuning varactors across the gap between the conductors) is able to steer the beam.(The patches are very small comparing to wavelength).

By changing the capacitance between the patches one should be able to reflect the incident beam in different angles. (because of simulation time issue, I am working on a 5x5 patch array, however, for a good beam steering one need more number of patches)

I am having problem using HFSS to simulate this structure!

1) I used lumped RLC to model the capacitance across the gaps! Is there any other way to model this varactor diodes?!

2) To find out how the structure steers the beam (The reflection angle should depend on the capacitance of the varactors across the gap), I have plotted the bistatic RCS for 0<theta<180. But the RCS does not really change when I change the capacitance! apparently there is something wrong in my simulation!
does anybody have an idea how to model this?! Is there other ways I can use to simulate this structure in HFSS?! Any other way to find out how the angle changes based on the capacitance of the varactors!

Thanks,
Ben

Yes. Ansoft Designer comes to your rescue here. It will easily let you model active devices like PIN, varactors and also to have a control over the controlling voltage. As far as i know its a licensed one.

and i guess ADS also has the facility of device modelling.

moreover if you don't mind, you can upload your antenna design, so that somebody may help you with device modeling part.

hope it helps.

Ashish

Ashish

Thanks,
Here you go! attached is my design!
The more important problem is, how to really see that this structure is able to steer the beam!
Is the RCS idea a good one?! Or there is there any other way?!
Thanks All

- - - Updated - - -

Ashish

Thanks,
Here you go! attached is my design!
The more important problem is, how to really see that this structure is able to steer the beam!
Is the RCS idea a good one?! Or there is there any other way?!
Thanks All

Hello Ben..
your attached file cannot open with me ...i use 10 version of hfss... what do you thing the problem is?