Hello everybody, I am designing cascaded filters using LTCC stripline structure at frequency of 5.8 GHz. I have to find the external quality factor and for...
fmagabl
fmagabl@...
Jul 21, 2004 2:54 pm
888
This subject was discussed in the past. Look for those postings: 699 Group Delay in Filters John Ness Mon 1/5/2004 680 Re: how to extract the external...
Thank you for your recommendation of the book Dielectric Resonators by Kajfez and Guilon. It was most helpful. I am trying to analyse different coupling...
jacet2405
jacet2405@...
Aug 17, 2004 2:29 pm
890
For the type of filter you referred to, you may want to read: Dual-mode filters with conductor loaded dielectric resonators Hunter, I.C.; Dassonville, V.;...
Dear Group, has anybody an idea how to get "A. E. Atia, and A. E. Williams, "A solution for narrow-band coupled cavities," COMSAT Technical Memorandum CL- ...
toni_lindner
anton.lindner@...
Aug 24, 2004 11:07 am
892
This old memo is unfortunately not available. However, essentially all of its contents has been published in the IEEE Transactions on Circuits and Systems,...
Ali Atia
atia.ali@...
Aug 25, 2004 12:51 pm
893
Thank you, this helps a lot! ... all of ... Circuits and ... the ... Cavity ... <anton.lindner@sp ... inner.de>...
toni_lindner
anton.lindner@...
Aug 25, 2004 2:54 pm
894
A question for Ralph Levy... Ralph, In your article entitled "Design Considerations for Lumped-Element Microwave Filters" in Microwave Journal 1988, you ...
richard_gipps
rgipps@...
Sep 13, 2004 12:57 am
895
Richard, There is another discussion on this topic in the survey paper By. R. Levy, R. Snyder and G. Matthaei, "Design of Microwave Filters," IEEE Trans. on...
Ralph Levy
r.levy@...
Sep 13, 2004 7:39 pm
896
One comment: In my experience, coils that have axial length approximately equal to diameter (if round coils) or equal to hypotenuse (if square coils) have the ...
An addition to the comment below: The situation is actually somewhat more complex. If you define the diameter of the coil as the mean diameter then the Q is...
Ralph Levy
r.levy@...
Sep 14, 2004 6:09 pm
898
That explanation certainly provides a lot of clarity on my observations over the years. Obviously, working with small diameter coils, if the wire size is ...
Dear experts, I am a master student doing my research on the design of microwave filters for satellite applications ... Currently I am working on a dual mode...
Mohamed H. Awida
awida@...
Sep 14, 2004 9:10 pm
900
1. The formula you have for R is correct. Since the input/output are coupled to one mode, there is no coupling to the orthogonal dual mode of the input and...
Ali Atia
atia.ali@...
Sep 15, 2004 12:28 pm
901
Thank you Prof. Ali for your interest Best Regards MOhamed ... are ... mode of ... corrections ... described by ... the main ... polarizability of ... main...
Mohamed H. Awida
awida@...
Sep 16, 2004 11:34 pm
902
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Reva Goode
Adkinsdabww@...
Sep 19, 2004 4:02 pm
903
Ralph, Thanks for your responses, it has certainly cleared a number of points. As I looked at the formulas you presented a couple more questions came to mind....
richard_gipps
rgipps@...
Sep 19, 2004 4:02 pm
904
Richard, The values for K are valid for either copper or silver wire - there is a only tiny difference between the conductivity of copper and silver. Actually...
Ralph Levy
r.levy@...
Sep 19, 2004 6:01 pm
905
Hello Gentlemen, I will design a direct-coupled wave-guide filter with three-rod inductive iris. Will you please advise me some equations I can use to design...
Several years ago I developed a design procedure for this kind of filter based on a suitable equivalent circuit for single and double post in rectangular...
I would be extremely grateful if someone could help me to understand the derivation of the expansion for the Ez field of the TMz modes within a triangular...
rob smith
moorgate5@...
Sep 27, 2004 1:12 pm
908
I have a problem in applying in a transmitt & receive system in 450 Mhz, I need to high isolation circulator module ,Do you know a special module from a...
jbaabuei
jbaabuei@...
Oct 18, 2004 12:42 am
909
Baabuei, A high isolation circulator for a T/R system is useless if antenna VSWR is say 1.5:1 (14 dB return loss). You will get no advantage over a 20 dB...
pedrojglez74
pedrojglez74@...
Oct 18, 2004 12:21 pm
910
Hello, More thank you for your response. I can explain you my mean as following: when we apply a circulator for a T/R system we connnect three port of ...
jbaabuei
jbaabuei@...
Oct 21, 2004 12:51 pm
911
... Then consider this signal path: - one forward transmission to port 2 (let's say -1 dB) - one reflection off antenna (-14 dB) - one forward transmission to...
Hello, My name is Paul Herzig and I work at Raytheon. I am trying to understand design of Combline Dielectric Resonators, such as those described by Zaki et al...
mountainmn45
mountainmn45@...
Nov 12, 2004 7:29 pm
913
Paul, The easiest way is to start from metal combline resonator and replace the metal post with dielectric rod of similar size. There are plenty of references...
Dr Yu, Thank you for your response. I am pretty familiar with standard metallic combline structures and their analysis. I do have access to HFSS and have tried...
mountainmn45
mountainmn45@...
Nov 15, 2004 7:57 pm
915
Which character is changing when the dielectric temperature changed, permittivity or dimension? Thanks your help. xinshe_yin...
xinshe_yin
yin.xinshe@...
Dec 3, 2004 12:17 pm
916
Xinshe, Both dielectric constant and dimensions will change over temperature. They can be characterized by so called temperature coefficients (TC). You also ...
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