priyankguddu
Member level 3
filtros combline con hfss
Hello All,
I am simulating a cross coupled combline filter on HFSS using Irises for cross coupling. I have got the normalized coupling matrix but now I am facing difficulty in finding out the Iris dimensions for the given cross coupling values.
What I did was that I simulated a pair of combline resonators with an Iris in between and ran an eigenfrequency analysis for this and computed the coupling coefficient by taking the first 2 resonant frequencies
k = (f1^2-f2^2)/(f1^2+f2^2).
The problem is that the maximum coupling values I have been able to obtain is around 0.1 where as the coupling matrix needs coupling of the order of 0.8 to 0.9.
The second method I followed was placing a perfect E wall between the Iris coupled resonators and did the eigenfrequency analysis (feven) and then placed a perfect H wall in between them and did the same analysis (fodd)
k = (feven^2-fodd^2)/(feven^2+fodd^2).
Even here k is around 0.1 but I need a higher value.
What to do. Please help
Hello All,
I am simulating a cross coupled combline filter on HFSS using Irises for cross coupling. I have got the normalized coupling matrix but now I am facing difficulty in finding out the Iris dimensions for the given cross coupling values.
What I did was that I simulated a pair of combline resonators with an Iris in between and ran an eigenfrequency analysis for this and computed the coupling coefficient by taking the first 2 resonant frequencies
k = (f1^2-f2^2)/(f1^2+f2^2).
The problem is that the maximum coupling values I have been able to obtain is around 0.1 where as the coupling matrix needs coupling of the order of 0.8 to 0.9.
The second method I followed was placing a perfect E wall between the Iris coupled resonators and did the eigenfrequency analysis (feven) and then placed a perfect H wall in between them and did the same analysis (fodd)
k = (feven^2-fodd^2)/(feven^2+fodd^2).
Even here k is around 0.1 but I need a higher value.
What to do. Please help