tucheng
Newbie level 6
I have read a paper titled "Narrow-Band Microwave Filter Design", which is written by Daniel G. Swanson(This paper can be download from the website of Microwave Magazine). I am really confused about the approach in that paper by which the unloaded quality factor(Qu) is obtained. To calculate Qu, equation 6 below is used in the paper.
As we can see in the above equation, insertion loss(IL) should be known before calculating Qu. However, as shown below, equation 1, which is used to estimate insertion loss, can not be obtained without knowing Qu!
I think it is self-contradictory. Can anyone explain this to me or tell me how to obtain Qu using other appoach please? Thanks!
Added after 24 minutes:
I am sorry the second picture is not clear. I upload a new one below.
As we can see in the above equation, insertion loss(IL) should be known before calculating Qu. However, as shown below, equation 1, which is used to estimate insertion loss, can not be obtained without knowing Qu!
I think it is self-contradictory. Can anyone explain this to me or tell me how to obtain Qu using other appoach please? Thanks!
Added after 24 minutes:
I am sorry the second picture is not clear. I upload a new one below.