| Author |
Message |
CoupleFil
Joined: 08 Nov 2007
Posts: 8
Location: Switzerland
|
 13 Nov 2007 21:12 Cross-coupled filter synthesis software CoupleFil |
|
|
|
Hi filter designers!
For narrow single or multiple bandpass filters it is advantageous using cross-coupled filter designs. Since cross-couplings cause total absorbability for desired frequencies, a cross-coupled cavity filter needs fewer resonators than a simple-coupled one, what will result in a better through loss.
CoupleFil reduces the time and effort to reach optimal solution for cross-coupled filters.
You may download a trial version under www.CoupleFil.com
|
|
| Back to top |
|
 |
Filtronetics
Joined: 10 Nov 2004
Posts: 34
|
| 01 Feb 2008 20:49 Cross-coupled filter synthesis software CoupleFil |
|
|
|
| Can you offer some details of your software?
|
|
| Back to top |
|
|
CoupleFil
Joined: 08 Nov 2007
Posts: 8
Location: Switzerland
|
| 04 Feb 2008 18:41 Cross-coupled filter synthesis software CoupleFil |
|
|
|
Hi Filtronetics
CoupleFil is a synthesis tool for designing cross-coupled bandpass filters. You will find the optimal solution in a very short time. Here are the main features:
- synthesis for single and multiple bandpass filters
- find the optimal solution for transmission and reflexion curve
- 'one-click' solver for the approximation problem
- select the best out of all usefull topologies
- sensitivity analysis
- calculation of coupling matrix, coupling coefficient, center frequencies and coupling bandwidth
- lossy analysis
- group delay analysis
- ...
The main advantages of a cross-coupled filter designed with CoupleFil are:
- fast filter developement
- improved through loss compared to single coupled filter
- steeper frequency edges due to transmission zeros
- quick results
- list of all useful filter topologies
- illustration of the topology like triplets, quadruplets and other structures
- appropriate tunable results
- smaller mechanical dimensions
- ...
Here is a screenshot of the programm:
You will find more information and a trial version on www.CoupleFil.com.
Do not hesitate to contact us.
|
|
| Back to top |
|
|
master_picengineer
Joined: 03 Sep 2007
Posts: 1069
Helped: 62
|
| 04 Feb 2008 19:34 Cross-coupled filter synthesis software CoupleFil |
|
|
|
| Interresting tool. But could you tell us what are it's advantages vs other tools ?
|
|
| Back to top |
|
|
CoupleFil
Joined: 08 Nov 2007
Posts: 8
Location: Switzerland
|
| 04 Feb 2008 23:48 Re: Cross-coupled filter synthesis software CoupleFil |
|
|
|
Hi master_picengineer
You can find the most important advantages in the previous post. Moreover, the software is easy to handle and contains many opportunities to reach optimal filter performance.
As far as I know, there is no other comparable software to calculate the matrix of a cross-coupled filter. However, if you can give me names of software which is comparable to CoupleFil, I will try to point out the advantages.
I hope I could help you so far and do not hesitate to ask some more questions.
Regards
Martin
|
|
| Back to top |
|
|
Filtronetics
Joined: 10 Nov 2004
Posts: 34
|
| 05 Feb 2008 5:41 Re: Cross-coupled filter synthesis software CoupleFil |
|
|
|
Thank you for your reply. From what you posted here, your software is based on math models. How your software compare with Filpro, which was developed by a profeesor and his students in Turkey. Could you offer some comments?
On the other hand, does your softwere also give the real design? I mean the dementions of the filter, such as a cross-coupled combline filter.
|
|
| Back to top |
|
|
CoupleFil
Joined: 08 Nov 2007
Posts: 8
Location: Switzerland
|
| 05 Feb 2008 13:26 Re: Cross-coupled filter synthesis software CoupleFil |
|
|
|
Hi Filtronetics
CoupleFil is based on mathematical models which most of the developpers are satisfy with. The developpers I know just need the information from the coupling matrix and then straight go to the EM simulation without any e.g. lumped element circuit. You have to pay attention if you have a specification with a large bandwidth and you want to take advantage from symmetric responses (may save couplings).
Filpro has no direct synthesis. There you have to extract the poles and you have to apply several network transformation ending up in a design with triplets and quadruplets. You never know if you found an optimal solution. If you want another coupling schema you have to start over again. The handling of the tool is very difficult. The people who worked with Filpro may confirm this. Solving the approximation problem is missing in Filpro at all you have only an unhandy 'tuner'. For this design step you need another tool anyway.
Here the advantages and disadvantages of CoupleFil again:
+ Approximation
+ Optimal solution
+ Handling
+ Design speed
+ Complete synthesis in one tool
+ Multiple bandpass
+ Topologies
- No real model
- No further network transformations
Kind Regards
|
|
| Back to top |
|
|
Filtronetics
Joined: 10 Nov 2004
Posts: 34
|
| 05 Feb 2008 22:58 Re: Cross-coupled filter synthesis software CoupleFil |
|
|
|
In diplexer designs, asymmetric response always helps to achieve the desired issolation. People normally use triplets which are not as efficient as quadruplets. But quadruplets normally give a transmission zero on each side of the passband. I know that some people also use quadruplet to realize two transmissions on the same side of the passband. Can you give me an example of realizing two transimission zeros on the same side with four resonators?
Thank you!
|
|
| Back to top |
|
|
CoupleFil
Joined: 08 Nov 2007
Posts: 8
Location: Switzerland
|
| 05 Feb 2008 23:17 Re: Cross-coupled filter synthesis software CoupleFil |
|
|
|
Hi Filtronetics
Here you have a screenshot of an quadruplet with the transmission zeros both located in the upper stopband. With CoupleFil this example takes you less than 5 minutes to design.
You may download the demo version of CoupleFil and just try to build your own filters.
Please feel free to post further comments.
Regards
|
|
| Back to top |
|
|
Filtronetics
Joined: 10 Nov 2004
Posts: 34
|
| 14 Feb 2008 22:08 Cross-coupled filter synthesis software CoupleFil |
|
|
|
| Very impressive by the results you show. Have you got many customers for your software?
|
|
| Back to top |
|
|
CoupleFil
Joined: 08 Nov 2007
Posts: 8
Location: Switzerland
|
| 15 Feb 2008 9:25 Re: Cross-coupled filter synthesis software CoupleFil |
|
|
|
Hi Filtronetics,
We had our first presentation of CoupleFil at the 3rd European User Group Meeting from CST in September 2007. In December we founded our company and already have some licnsees.
You will find more information about us in the following flyer.
If you are interested in CoupleFil I do like to send you an offer. Do not hesitate to contact me again.
Kind regards
Martin
|
|
| Back to top |
|
|
Filtronetics
Joined: 10 Nov 2004
Posts: 34
|
| 15 Feb 2008 17:30 Cross-coupled filter synthesis software CoupleFil |
|
|
|
Hi, Martin,
Thanks a lot! Right now I don't have an immediate requirement for buying your software. I use lumped element model which works fairly well for the filters I am designing. But obviouly your software is much more powerful. If in the future there is a requirement to upgrade my modeling capability, I will contact you.
Best regards,
Filtronetics
|
|
| Back to top |
|
|
vitan2
Joined: 23 Nov 2007
Posts: 11
|
| 27 Aug 2008 20:02 Re: Cross-coupled filter synthesis software CoupleFil |
|
|
|
Hello Martin
This software looks very good. I would like to ask you, if the full version or next version (in future) has or will have aproximation of group delay, so that you can add complex poles and you get ripple of group delay.Iam interested in filters with almost constat of group delay in some parts of passband and this feature will be very usefull.
many thanks
BR
Vitan2
vinny(at)seznam.cz
| CoupleFil wrote: |
Hi Filtronetics,
We had our first presentation of CoupleFil at the 3rd European User Group Meeting from CST in September 2007. In December we founded our company and already have some licnsees.
You will find more information about us in the following flyer.
If you are interested in CoupleFil I do like to send you an offer. Do not hesitate to contact me again.
Kind regards
Martin |
|
|
| Back to top |
|
|
CoupleFil
Joined: 08 Nov 2007
Posts: 8
Location: Switzerland
|
| 28 Aug 2008 12:43 Re: Cross-coupled filter synthesis software CoupleFil |
|
|
|
Hello Vitan2,
Insertion of conjugate complex poles for group delay smoothing is not implemented yet, but will be implemented in a further version. Displaying the group delay is already available. Implementing an approximation procedure for the group delay will be a more complex task and is not planned yet.
Best regards
Martin
|
|
| Back to top |
|
|
