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RF microstrip band filter with non ideal conductor
Posted Jun 24, 2014, 7:52 p.m. EDT RF & Microwave Engineering Version 4.3 1 Reply
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Hi,
I am trying to model a spiral resonator microstrip for filtering certain frequencies. The design I am using is a pretty common and simple one; a microstrip with a single resonator on a dielectric substrate and a ground plate at the other side of the substrate.
Now, my problem is I cannot define the strip and the ground as Perfect Electrical Conductor (PEC) because I will actually fabricate this device and the material I will be using is far from an ideal conductor. It is a low conductivity material and I need to see how it will behave with different dimensions and designs.
I tried using impedance boundary condition for the strip by removing substrate from emw domain but it keeps giving error in uniform lumped port setup when I try to compute. My lumped port boundaries are defined. I don't know why it gives me this problem.
On the other hand, I don't even know if comsol allows non-ideal conductor for RF microstrip since there are absolutely no examples around.
Help is greatly appreciated!!
Thank you
I am trying to model a spiral resonator microstrip for filtering certain frequencies. The design I am using is a pretty common and simple one; a microstrip with a single resonator on a dielectric substrate and a ground plate at the other side of the substrate.
Now, my problem is I cannot define the strip and the ground as Perfect Electrical Conductor (PEC) because I will actually fabricate this device and the material I will be using is far from an ideal conductor. It is a low conductivity material and I need to see how it will behave with different dimensions and designs.
I tried using impedance boundary condition for the strip by removing substrate from emw domain but it keeps giving error in uniform lumped port setup when I try to compute. My lumped port boundaries are defined. I don't know why it gives me this problem.
On the other hand, I don't even know if comsol allows non-ideal conductor for RF microstrip since there are absolutely no examples around.
Help is greatly appreciated!!
Thank you
1 Reply Last Post Jun 25, 2014, 12:23 p.m. EDT
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Posted:
1 decade ago
Dogan,
The appropriate boundary condition to account for strip resistive losses is Transition Boundary Condition where you specify strip electrical properties (permittivity, permeability, and conductivity) and strip thickness.
Regards,
Sergei
The appropriate boundary condition to account for strip resistive losses is Transition Boundary Condition where you specify strip electrical properties (permittivity, permeability, and conductivity) and strip thickness.
Regards,
Sergei