Just out of curiosity, is a must to have silver plated resonators? What about nickel plated resonators? Their conductivity is of course slightly poorer, but...
Sorry, that won't work. The conductivity of nickel is significantly lower than aluminum or brass, and much lower than copper or silver. The unloaded Q would...
I have some questions and I need help. 1. When coupled resonators are asynchronously tuned, what is the phsical meaning of the diagonal elements of the...
hi all, what I am looking for is the title/author of a text (a monograph?) I remember coming across in the Delft University library in the early 1970s, back...
The book is Frequency Filter Methods and the author is Prof. Torbern Laurent. It was published by Wiley in 1964. The late John Orchard, in Trans. Circuit...
H Clark Bell
h.c.bell@...
May 20, 2008 10:05 pm
1729
Are you aware of Chapter 10 in the book "Microwave Filters, Impedance-Matching Networks, and Coupling Structures" by Matthaei, Young, and Jones? That chapter...
George Matthaei
gmatthaei@...
May 21, 2008 4:56 pm
1730
What I am looking for is the title/author of a text (a monograph?) I remember coming across in the Delft University library in the early 1970s, back when the...
joetauritz
joetauritz@...
May 21, 2008 5:12 pm
1731
This was answered by Clark Bell and George Matthaei. It appears to be a second posting of the same question. Please note the answers posted on the website...
... be a second posting of ... and probably sent to you as ... Groups Links ... This was an earlier attempt to post a question. After dispatching it I ...
Dear All, I was wondering if any one can direct me to some references on temperature compensation of dielectric microwave filters ? Thanks Hamid...
salehi_h
salehi_h@...
May 28, 2008 3:41 pm
1736
Dear Experts, I am tuning a bandpass+lowpass unit,where bandpass have a center freq of about 1700MHz and bandwidth 15MHz, the lowpass are required to give 75db...
I think subject was covered in prior communications on this forum. This problem is likely due to line length issues in the lines connecting the various...
Dear Yun, I think that the problem is caused by coaxial waveguide moding due to the rather large diameter of 10 mm. The first spurious mode is the TE11, and if...
Ralph Levy
r.levy@...
Jun 8, 2008 6:09 pm
1739
Dear Dr.Levy and Dr.Snyder, Thanks for your response. I found it can slightly change the attenuation by tuning the diameter or diameter of the connecting metal...
Dear Yun, You have a rather large coax diameter for a filter that is to reject up to 13 GHz. It would be unwise to exceed a diameter of 7 mm. The higher order...
Ralph Levy
r.levy@...
Jun 10, 2008 7:31 pm
1741
Yes, I also considered the coax diameter is too large when designing. But the lowpass is a bit long, 140mm, if the diameter too small,it is not easy to make...
Hi all; We've modeled a strip-line interdigital filter in Sonnet, and in HFSS. Both models predict the same center frequency, but the HFSS model prediicts a...
qfilter
qfilter@...
Jun 12, 2008 6:57 pm
1743
Dear Sirs, I am facing a spec of combiner,which hope to combine two channels of 400khz bandwith into one,with center freq about 150MHz, and freq space as...
Hi Yun; You may wish to proceed as follows: 1. Design a lumped element diplexer to meet your specs, with infinite Q components. 2. Change your model from...
qfilter
qfilter@...
Jul 3, 2008 6:17 pm
1745
I will be out of the office starting 06/30/2008 and will not return until 07/04/2008. For urgent question, please contact Hiren Baxi. ... Notice: This e-mail...
Chi Wang
wang.chi@...
Jul 3, 2008 8:03 pm
1746
Dear Yun, As Mr. Levy said, the first higher order mode is the TE11 mode. This mode has different symmetry in field distribution than TEM mode, so "ideally"...
santiago.sobrino
santiago.sobrino@...
Jul 6, 2008 8:12 pm
1747
Hi Yun, I have just remembered that the classic way to deal with such problem diplexers at relatively low frequencies involving very narrow bandwidth filters...
Ralph Levy
r.levy@...
Jul 8, 2008 12:46 am
1748
Hello, all; I m asking a quenstion about the resonat frequency and coupling effect. I often simulate the single cavity in HFSS eigenmode to get the resonant...
Not sure if you got the answer. If not, the paper below gives a simple fomular for estimating the coupling effects to f0. Regards, Chi Wang H.-W. Yao, K.A....
Chi Wang
wang.chi@...
Jul 18, 2008 1:08 pm
1750
Hello, Dr Chi Wang. Thanks for your reply, I m not very clear about the formular in this papper. Probabely I don't make myself clear. I meant something like...
JC, 1. Make a circuit theory model of your resonators and couplings. 2. Pick a resonator to compute frequency 3. Short out the adjacent resonators 4. Compute...
Swanson, Daniel
swansond@...
Jul 30, 2008 12:10 pm
1752
Hello JC, As stated by Dan, the frequency change can be observed by experient or using a simple circuit analysis. Please note that for electric coupling, the...
Chi Wang
wang.chi@...
Jul 30, 2008 12:52 pm
1753
The formula I use to calculate the coupling loading effect is: fi=f0/sqrt(1+ki-1,i + ki,i+1 + ki,j), where ki,j is the cross coupling coefficient, ki-1,i and...
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