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...
I read about this paper "Novel Approach to the Synthesis of Microwave Diplexers" many times.I still have a question unsolved. In this paper,there are 5...
There are various way to obtain the polynomials referring to a passband different from [-1 1]. The simplest one is to evaluate the polynomials for [-1 1]...
Recently I was asked to comment on a narrow bandpass filter for high power at low VHF frequencies. A brief analysis revealed that the insertion loss would be...
Is there commercial software available that can extract the coupling matrix from the s-parameter file derived from the HFSS filter model with lumped ports on...
Dear sir, I tried to follow the paper, Novel Approch to the synthesis of microwave diplexers. I'v got same result for the Type 2 example case. But for the...
Dear experts, I'm now studying for polynomial synthesis from the book Microwave filters for communication systems. At the page 312, in the table 8.3 I got...
There was a small error in the formula for epsilon in equation (8.38)on page 304 of the book 'Microwave Filters ...' :- F(s) should read F(s)/epsR This...
Thank you for your e-mail. Could you explain why there is small differece for P? At the page 312, at the table 8.3 The value of P j1.0 +2.2128 +j26.5826 ...
Hi, I am wondering if someboby of you might recommend me reference (paper or book) about the fundamental definition of active scattering parameters for passive...
The small differences that you are observing are probably due to rounding errors. When the TX zeros were optimized to give the required lobe levels, the...
Dear experts, Can anybody give some guidance to the design of narrow band notch filters(for example, the notch band is 2000+/-0.5MHz? I guess there need to...
Dear Yun, There are numerous papers on bandstop filters published in the IEEE Trans. on MTT. Try starting with the chapter on such filters in Matthaei, Young,...
Ralph Levy
r.levy@...
Nov 1, 2009 5:49 pm
1839
Dear experts, Now I am puzzled with a filter problem. I want to design a varactor tunable bandpass filter which operates 100MHz-200MHz.The insert loss and...
Dear fellow coaxial friends Anyone knows where I can find the information regarding the followings equipment, reading the internet seems confusing at times, as...
wuchanglim
wuchanglim@...
Nov 5, 2009 10:41 pm
1841
(The workshop registration is free) Title: International Workshop on Microwave Filters Start date: 16 November 2009 End date: - 18 November 2009 Organizer:...
Hi Ming, This looks a very interesting programme. Thanks for putting it up on MTT8, I wasn't aware of it. I would like to come but its probably a bit short...
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