Dear Experts: I had read Cameron's "General Coupling Matrix Synthesis Methods for Chebyshev Filtering Functions", and want to draw S21 and S11 curve, I wrote...
I cannot speak Matlab very well but it looks to me that you have a single-terminated filter here, in which case you cannot use the S21 and S11 formulae that...
Looking at your MATLAB code a little more closely, I see that you are using an 'NxN' matrix rather than an 'N+2' matrix (where R1=R2=1.0). In this case you...
I tried S21 = -inva[7,1]/(1.0+inva[7,7]) instead, and w1=w-1/w replaced by w1=w(Here not quite understand,Is Atia's equivalent circuit of n coupled circuit a...
Dear Mr. Cameron: According to your proposal, I replace S21 with S21=-inva[7,1]*sqrt(R1*R2)/(1.0+inva[7,7]*R2, and frequency variable ˇ°w1=w-1/wˇ± replaced...
Dear Expert: I am reading Amari's paper-->, and have some question. As follows(page 9/10), I know S21, but donˇŻt how to get S11( does not meet energy...
Dear Experts I would be grateful if someone share their experience on the following issue: I have some questions about the Coaxial power combiner 1- What is...
I will be out of the office starting 09/12/2008 and will not return until 09/26/2008. For urgent question, please contact Hiren Baxi. ... Notice: This e-mail...
Chi Wang
wang.chi@...
Sep 15, 2008 8:01 am
1794
Dear experts. I am thinking of solution for KU band tunable filter, but because there is a spec to tuning speed,no bigger than 100ns, so YIG can not be of...
Does anybody know whether there is variable capacitor with tuning range covering 0.02-0.1pf? or is there mems variable capacitors of single chip form? Thanks. ...
I am trying to simulate a direct-coupled band stop filter, similar to the filter in fig. 1 of the Cameron paper, " Direct-Coupled Microwave Filters With Single...
salehi_h
salehi_h@...
Nov 8, 2008 4:43 pm
1797
Dear Sirs, I want to know the common and practical method of designing interdigital capacitors. In my circuit, I need to implement such capacitors. Thanks if...
Hello, all I want to know is there any method to calculate the equivalent capacitance and indutance of coaxial resonator, thus to model a accruate equivalent...
Yes, for coaxial TEM-mode resonators, there is a direct method: Sarbacher, 'Hyper and ultra-high frequency engineering', page 337 - 341 You can also derive...
I will be out of the office starting 11/12/2008 and will not return until 11/21/2008. For urgent issue, please contact Hiren Baxi. ... Notice: This e-mail is...
Chi Wang
wang.chi@...
Nov 14, 2008 9:01 am
1801
How do you calculate the coupling coefficient (in GHz) from the k value?...
How to select the normalization impedance for forward and backward traveling waves when metallic loss in a transmission line is considered? The line impedance...
Normally when analyzing a microwave circuit we simply consider the lossless case and then determine the effect of finite losses using simple formulas. In such...
Ralph Levy
r.levy@...
Mar 23, 2009 6:31 pm
1804
Ralph, thank you very much for your very kind reply. You're right, metallic loss is not a problem. But if you use a 3D em tool to calculate the scattering...
A paper on "power waves" is : K. Kurokawa, "Power Waves and the Scattering Matrix," IRE Trans. on MTT vol. 13, pp. 194-202, March 1965. Here the real part of...
Ralph Levy
r.levy@...
Mar 24, 2009 7:36 pm
1806
I agree with Dr. Levy, except when computing the scattering parameters in below-cutoff dispersive sections....then one indeed needs the complex normalizing...
Yes, of course the inclusion of an evanescent mode transmission line requires normalization to a complex (imaginary) impedance. I even wrote a paper on such...
Ralph Levy
r.levy@...
Mar 25, 2009 12:24 am
1808
Hi, I'm having trouble finding the correct group delay value in HFSS. I'm not sure where I should put my reference plane. For the input coupling to the first...
Dear MTT-8 experts, I've been having trouble correctly setting the reference plane when I'm doing filter design in HFSS. I'm trying to design filters by using...
As long you did not put the reference plane too close to the first discontinuity, the position of the plane should not change the value of group delay...
Dear Dr. Yu, Thanks a lot for your reply. As you mentioned, the group delay does not change significantly. I'm just thinking, in order to do fine tuning, it is...
Hello, I am designing an ultra-wide band bandpass filter for the freq range of 3-10 GHz. At first, I will design a lowpass filter for 10 GHz then cascade...
Dear Fazlina, There is not a lot of model information available for suspended stripline. You can generate your own models for open ends and various junctions...
Daniel Swanson (Cobha...
Daniel.Swanson@...
Apr 2, 2009 7:18 pm
1814
Hello, I want to design a bandpass filter using "suspended stripline structure". From the lumped elements and distributed elements obtained using Alseyab...
n_fazlina_ml
n_fazlina_ml@...
Apr 5, 2009 2:10 pm
1815
hi your friend to you talk correct good luck hazeri ________________________________ From: Nor Fazlina Mohd Lazim <n_fazlina_ml@...> To:...
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