While designing reconfigurable antenna using PIN diodes , how we can simulate that in CST Microwave Studio by including the biasing voltages for the PIN Diodes?
We can add diode parameters using lumped elements values corresponding to diode but how to add biasing voltage in order to get the diode function as it is required to?
Thank you.
Hi,
Since the PIN diode on/off state (that relates to the biasing) is change in Capacitance value, you only need to change the series value of C. There is no need to model DC source in CST.
based on the datasheet and when biased, it has C=100fF and when DC off, it is C=0 and R=10 ohm.
It is not possible to include DC lines in the simulation when using CST. Thats way as stated above you must model the diode using equivalent circuit models.
On the other hand if you have the spice parameter models for diodes you can re-model your design in NI AWR to include the diodes. But it is actually the same thing.
What I meant to ask is that - How we can power the PIN Diodes used in the simulation for designing reconfigurable antenna ?
Dear Anand,
If I understood correctly, you are trying to simulate the full model (the antenna and the diode in operation) of your re-configurable antenna. For this purpose, you will need to run a co-simulation from Design Studio (DS) in CST. It is hard to include the full details, but the general approach would include placing a discrete port in Microwave Studio (MWS) where you want to place your diode. Then, in DS you connect the diode to the discrete port. You can also add the spice model of this diode in DS. Please note that you will need to activate differential ports in the properties menu of your model (in DS). If you connect an external port to the diode in DS, then you can apply a DC voltage as bios voltage. Finally, you will need to run an AC combine results task from DS to run the full simulation.
I hope you find this helpful.
Thank you.
Robert Salama.
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