Hi, Liu Yun, How about the final results of your stripline coupler. Currently, I simulated a stripline coupler at 64MHz with HFSS, and get about 20dB...
royal1428
royal1428@...
Dec 4, 2009 8:59 pm
1845
Hello Yu, I only did the simulation and changed to use waveguide structure because it has waveguide ports, and I did not do an experiment for it. As to 64MHz...
Hi, Liu Yun, How about the final results of your stripline coupler. Currently, I simulated a stripline coupler at 64MHz with HFSS, and get about 20dB...
royal1428
royal1428@...
Dec 3, 2009 10:15 pm
1843
Dear Colleagues, We have an open Post-doc/Engineer position at our lab on the topics of multiplexer synthesis. See following link for details: ...
fabseyfert
fabseyfert@...
Nov 23, 2009 11:15 am
1842
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...
(The workshop registration is free) Title: International Workshop on Microwave Filters Start date: 16 November 2009 End date: - 18 November 2009 Organizer:...
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
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 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
1837
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...
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...
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...
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 ...
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...
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...
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...
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...
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...
... hi F.Seyfert,can you tell me the extracted methods of your coupling matrix ,the methods of Caemron's 1999 or not....
zhca2007
zhca2007@...
Jul 22, 2009 11:59 am
1826
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]...
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...
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...
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 ...
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...
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
1819
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...
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 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
1816
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...
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