Hello, Everyone, Happy new year! I received a set of specifications for a filter design. The fc~1.9 GHz, BW-3dB~60 MHz. I found the minimum number of...
Fei, Yes, a 3 resonator combline filter is possible, with one cross-coupling between resonators 1 and 3 (named as Triplet). However it produces only one Finite...
Fei, It is possible to introduce two transmission zeros into a 3-section combline filter either (1) by cross coupling across 4 nodes using either the source or...
Ralph Levy
r.levy@...
Jan 9, 2005 3:01 am
961
Fei, Dr. Levy is right. Sorry I was too biased towards the classical cross-coupled filters without source-load cross-coupling. Further I forgot to mention the...
Fei, It may be worth restating here the simple 'minimum path' rule that governs the number of transmission zeros (TZs) that a purely reactive direct-coupled...
Thanks to Dr.s Levy, Yildirim and Cameron for your answers. They make the picture much clearer now. In terms of insertion loss, I noticed that a 5th order...
feicaguo
xiaoao@...
Jan 10, 2005 4:52 pm
964
There is one additional possibility. If the comb-line resonators are made to be one quarter wavelength long, at the high frequency transmission zero, then a...
qfilter
qfilter@...
Jan 10, 2005 6:03 pm
965
Fei, Given mid-band and band edge insertion loss and/or delay variation as criteria, there is an optimum filter degree which is generally greater than that...
Ralph Levy
r.levy@...
Jan 10, 2005 7:45 pm
966
As a relatively fresh person in filters arena, I am trying to link the classical Cascade Synthesis theory to Cross-Coupled filters. This approach maps the...
Dear MTT Experts, I am a master student doing my research on the design of "Dual Mode Rectangular Waveguide Filters" ... I have a problem in designing the...
Mohamed H. Awida
awida@...
Jan 11, 2005 3:52 pm
968
Nevzat, It is possible to derive CT and CQ filters using cross couplings which include the source and/or load nodes. For CQ filters you can use the method...
Ralph Levy
r.levy@...
Jan 15, 2005 7:16 pm
969
Nevzat, Your question (3) highlight a difference between two types of filter with resonant couplings. The first type is a cascade of resonators with resonant...
Thanks Richard, I know the two kinds of the FTZ you mentioned. I was just trying to get a one-to-one correspondence between a direct coupled filter with...
As I have pointed out more than one time, the unloaded "Q" of the elements used in resonated couplings affects the depth of the FTZ's so implemented, and...
Theoretically when two signals flowing through two different paths are combined, if their magnitudes are equal and phase difference is 180 degrees, then they...
In practice, the cancellation sensitivity is greater when the Q's are low. The response "broadening" is significant, and it requires great accuracy in...
I am currently searching for suppliers of microwave filter. I require a device, based on planar technology (such as microstrip), which may be tuned in discrete...
dodson246
dodson246@...
Jan 25, 2005 1:35 pm
975
Hi, I'm currently sourcing this material for my friend. Material: Barium Tetratitanate Epsilon 78 Can anybody tell me the spec or the relevant website? Thanks...
... Do you mean something like this? http://www.temex.net/temex/product/microwav/ceramic/dm.html Perhaps you could be a little more specific as to the...
Any one is there to tell about significance of Q factor in receiver down conversion- I got this doubt to know technically the purpose of selection of...
G.L.Narasimha murthy
murthi_ki@...
Feb 8, 2005 4:14 pm
979
There are sevaral suppliers 1. Polezero with several tunable filters 2. Bowie (china) Roni ... require ... may ... termed ... conduct a ... someone...
Hello, I am interesting in FBAR or MEMS technology for filters. till now I found only narrow BW application for both. I will be glad if someone can advise for...
terry2buchi
terry2buchi@...
Feb 12, 2005 4:28 pm
981
Dear Mr. Saar, I see that apparently no one has responded yet, so here are a few references. The first paper on suspended substrate stripline (SSS) was by ...
Ralph Levy
r.levy@...
Feb 14, 2005 10:41 pm
982
Is the Coupling Coefficient concept a useful one when, for example, two shunt LC resonators are coupled by a series connected parallel LC element? If valid,...
Nevzat, Yes, the concept of coupling coefficient is valid when the coupling element is resonant. The concept is discussed in my joint paper with P. Petre in...
Ralph Levy
r.levy@...
Feb 22, 2005 6:02 am
984
Hi there, It is an interesting question. How do I evaluate or analysis the variation of group delay among samples in production? I have a few clues but am not...
feicaguo
feicaguo@...
Feb 22, 2005 5:02 pm
985
Hello, I have a design of some components (stip line ) in a box, salt water / ice and other environmental depositions on the box are seriously hampering the...
You need to have the housing hermetically sealed. There are a number of techniques for doing this, such as solder-sealing, laser sealing, or using gaskets....
Ralph Levy
r.levy@...
Feb 23, 2005 10:21 pm
987
Hello Dr. Levy and Lazar Ilchev, Thank you for replying to my question. But my problem is a bit different, the circuit is housed in an absolutely hermetically ...
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