Dear Everyone, I have some question about the external Q in microwave filter synthesis. By using the 1999 Cameron's paper I can extract the external Q by using...
Dear Everyone, I'm very sorry about my stupid questions. I found that R1=Ms1^2, Rn=MLN^2 from the page 4 in Cameron's 2003. Sincerly yours Junghak Ahn ... ...
Dear experts, how to approximately represent a section of Transmission line with two-port lumped element network in a specified frequency range? In my design...
Dear Experts, I have some questions about the Dielectric Resonator Filter Combiner. Frequency Band 1930~1990 MHz. Guard band is 3.75 MHz Tx 1 : 7 poles...
Hi All, Can someone help me figure out how to calculate the skew effect of combline filters? What factor should I add to my coupling matrix or polynomials? ...
salehi_h
salehi_h@...
Feb 5, 2007 8:29 pm
1566
Hamid, A transmission line based model using shorted shunt stubs and shorted series stubs will get you closer to reality than the coupling matrix alone. Beyond...
Swanson, Daniel
swansond@...
Feb 5, 2007 10:50 pm
1567
Dear Dan, Thank you for the info. I have heard you can also multiply the S11=F/E and S21=P/E polynomials by a skew factor which is tan(theta) to model the skew...
salehi_h
salehi_h@...
Feb 6, 2007 2:25 pm
1568
Dear Gentlemen, can anybody give some information on realizing wideband low freq coupler? for example: 80-1000MHz,10db coupling. Liu Yun...
You should be able to purchase such an item quite inexpensively from many companies, such as Minicircuits. The literature doesn't really include a lot of...
Dear Experts Does anyone who knows about the bandwidth limit for the TE01d dielectric resonator filter as the same time the filter has a good suppressing the...
Dear experts, These days I have seen many specs requiring 40dB directivity of Hybrid, for example with the freq range 880-960MHz. but it seems impossible. Liu...
You should be able to implement couplings using a combination of inductive irises and direct connection that achieve as much as 30 MHz BW at 1900 MHz F0....
Dear Dr. Richard Thank you for your comment. Now I'm finding the methode to suppress the spurious signal with changing the shape of coupling window. When I...
I am sorry, but you will simply have to do a little personal research in the literature. There have been publications by myself, Prof. Kawthar Zaki, Dr. Ming...
Other than using a LPF, the other thing you can use to trade is the Q factor of your resonators. If you load the cavity heavily (reduce height, increase C),...
Typically a TE01d mode resonator is suitable for <1% bandwidth filters. For example, less than 20MHz at 2GHz. The pitfalls of pushing to higher bandwidth was...
It is possible to design a 3dB quadrature hybrid to have 40 dB directivity, but probably only if the hybrid has strategically located tuning screws, at least...
Ralph Levy
r.levy@...
Feb 14, 2007 8:15 pm
1578
I would guess that the more narrow bandwidth for the waveguide coupler reduces the difficulty of the problem. It is probably quite difficult to obtain 40 dB...
(If you are talking about the predistrotion of a filter) The answer is really a function of how much predistortion you need. Knowing the ripple factor may be...
Dear All, I was wondering how the effect of humidity on the frequency response of a filter can be calculated? Does humidity just changes the dielectric...
salehi_h
salehi_h@...
Feb 20, 2007 6:04 pm
1581
Dear experts, I have some questions about the difference of tauf between high temp and low temp. I have made bandpass filter with dielectric resonator with...
Dear All, Does anyone know of a method to determine if the coupling between the orthogonal modes in a dual mode resonator is inductive (positive) or capacitive...
gwavetech
morten.hagensen@...
Mar 5, 2007 4:27 pm
1583
Dear Experts, I have to design a waffle-Iron filter with pass-band, 3.7 - 4.2 GHz, which can provide 60 dB rejection upto fourth harmonic and with high-power ...
ramagiri santhosh kumar
santhoshr@...
Apr 6, 2007 12:08 pm
1584
Hi,all experts, Has anybody designed a reject filter which only reject a point freq(for example 900MHz) to -20dB, but the total bandwidth of ripple is about ...
Dear experts, I've got a couple of questions with regard to combline filters: (1) Normally in transformer coupled comblines, by which I mean using extra...
amir_2001_ca
amir_2001_ca@...
Apr 6, 2007 12:13 pm
1586
Amir, You may take a look at Chapter-12 of the manual of Filpro for all of your questions. http://www.eee.metu.edu.tr/~nyil/manual In Figure 12.64 you will see...
Dear All, I have a question about Eigen value analysis of a filter, say a 4-pole filter operating at 2GHz. Assume that that the eigen value analysis of a stand...
salehi_h
salehi_h@...
Apr 18, 2007 2:32 pm
1588
Dear Experts: When we design a coupling window, we always construct a seperated 2-resonator model, unconsidering using the eigen mode method or the driven mode...
Liu, You may find the effect of extra resonators in a quad arrangement in this paper: M. E. Sabbagh, K. Zaki, and Ming Yu,"Full-Wave Analysis of Coupling...
Dear experts, I'm designing a dual-mode canonical filter at 12.68 Ghz ( Ku band ) with elliptic function.. i'm having problem in calculating the cut-off ...
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