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:...
Dear experts, I hope to have some guidance for circular waveguide coupler design. The copling is 6dB, and frequency range is 7-8.5GHz. Which structure is more...
Dear Yun, One method to realize, say, a 10 or 20 dB directional coupler is to couple a rectangular waveguide running in parallel with the circular waveguide...
Ralph Levy
r.levy@...
May 1, 2009 5:19 pm
1818
I have not had to build a waveguide coupler with coupling as strong as -6 dB, but if I did, perhaps I would build a stripline coupler at -6 dB and transition...
Dear Dr.Snyder and Dr.Levy, Thanks for your suggestions. In fact I designed a 6dB branch line coupler in microstrip form, and used microstrip-circular...
Dear Yun, I missed the 6 dB coupling requirement in my initial response. Actually there is no problem in realizing waveguide couplers for this case. There are...
Ralph Levy
r.levy@...
May 1, 2009 7:23 pm
1821
Hi all I would be very grateful if someone give me a comparison between two microstrip and CPLW 50ohm lines in terms of losses (conductive+dielectric) or...
Hello, all In making practical coaxial filter or duplexer for BTS, what is the recommended multiplying factor for skin depth of plating on the aluminum ...
Dear Experts, I am hoping to check the coupling between two resonators, which are resonating at the same frequency but with different addmittance slope, for...
Having problems with message search?
Fill out this form to ensure your group is one of the first to be migrated to the new message search system.
