AnsweredAssumed Answered

Slab Line Filter in MFilter

Question asked by JKOUZO on Mar 24, 2006
Latest reply on Apr 4, 2006 by JKOUZO

Like • Show 0 Likes0
Comment • 5

Most of my work uses slab line designs.
I have had problems that I have worked around but now I am at a standstill. HELP

The combline design uses an air dielectric but M-Filter insists I use a substrate from the library none of which use air. If I try to add a new substrate I Get an READ ONLY error message. I enter a new substrate with each task.

Now comes 2005. I am designing a 900 to 906 MHz BP filter with reasonable values and the dimentions in the equation window are insane. The graph seems to produce a reasonable response but spacings llike 0.0023. I have set the default units to mils.
Also I can not find what substrate is being used.

Sorry for the headache.

Jack Kouzoujian

No one else has this question

Outcomes

5 Replies

RANDY_RHEA Mar 27, 2006 2:04 AM
Mark Correct
Correct Answer
Hello Jack,

I am going to move this post to the Product Questions forum. I'm sure they will want a copy of your workspace so they can see what is going on. So you might go ahead and post your workspace file in the thread. They will also want to know what version of GENESYS and Windows you are using.

The support team moderates the Product Questions forum. If you post your "How to Use" product question there it gets logged in, the time taken to answer your question is monitored and if there is a bug it gets registered in the product development database.

Clear skies and high Q
Like • Show 0 Likes0
Actions
LMOELL Mar 27, 2006 4:35 AM
Mark Correct
Correct Answer
Jack,
I just fired up M-filter, and it seems pretty much the same as good ol' 2004, i.e. using the wizzard, you find the option which lets you define your substrate such as Air. This will then show up in your workspace tree.

Trying to save the newly defined substrade, it appears you have to create your own library! You can then add this to your design by under workspace tree choose add from library.....

But it seems to be a genuine bug, as the values in the
Tune Window are presented in Farads and meter no matter what you enter in the options/Unit

/Lasse
[/b]
Like • Show 0 Likes0
Actions
JERRY_MARKETOS Mar 28, 2006 3:29 AM
Mark Correct
Correct Answer
Jack's comments are acknowledged-
In Genesys 2005.11, the stage at which a substrate is added
does not allow the user to create a new substrate on the fly.
That was an oversight and has already been corrected in the
upcoming Genesys 2006 software. For 2005.11 it's necessary
to anticipate the substrate and create one (such as with Er=1)
before initiating the "choose manufacturing process" step.
It's not catastrophic if you forget this- Just choose any old
substrate to get through the menus. Then go back outside
the MFilter dialogue and add a new substrate (new, from library...)
and create the desired substrate. Then go back into MFilter and
select manufacturing process, call the new substrate.
Again, that has been addressed in the Genesys 2006 software.

Another thing I noticed while working with this item was that
MFilter seems to forget to update itself sometimes when manuf.
process is chosen- the graph goes away and a stack of problem
messages appears. To force recalc, I just go to the MFilter "settings"
tab and bump the filter order down, then back up. I brought this
to the attention of the developers.

Lastly, regarding the units-
The internal units are based (and shown) in MKS. That's why
the inconvenient looking figures appear / remain in the equations
and variable viewer. This is also acknowledged and will be improved
to something more user friendly in a future revision of software.
In the meantime, there's an easy workaround for this-
Just view the values on the schematic, which follows the user
units settings.
Like • Show 0 Likes0
Actions
JKOUZO Mar 28, 2006 8:40 AM
Mark Correct
Correct Answer
This is a follow up to my previous questions.
I now understand that the units displayed in the tume window are in M and F but they are also in the equations. I can live with that.

When adding components to the schematic, component "Q" seems to be missing.

Is there a simple way to transfer the schematic and equations designed in M-Filter to a new workspace without draging M-Filter along.

Thanks,

Jack Kouzoujian
Like • Show 0 Likes0
Actions
JKOUZO Apr 4, 2006 8:22 AM
Mark Correct
Correct Answer
I am having problems using 2005 M-filter.

If I try to OPTOMIZE an M-Filter design of a slab line comb filter, the program blows up and I must exit and restart.

Help,

Jack Kouzoujian
Like • Show 0 Likes0
Actions

Slab Line Filter in MFilter

Outcomes

Related Content

Recommended Content