Laura Halliday wrote:


What makes you think I don't know what being a student
is like? I'd hate to think I wasted such an obscene
amount of money on my B.Sc. and M.A.Sc. degrees. I
completed the latter in 2000, and the Internet was an
important tool. But it wasn't my *only* tool. Anybody
who thinks it is is either naive or stupid.

Laura Halliday

I agree with you. That's why I have a library of reference and data
books that fills a small bedroom in my house. A couple thousand books,
the list time I tried to get a full count. ;-)
--
25 days!


Michael A. Terrell
Central Florida

Hi Lenx,

Try to find 'Stripline Circuit Design' by Harlan Howe, Jr.

Sam

(Lenx) wrote in
m:

hello,
i am a student and we got a hf task for a lab project. we have to
built a low pass filter (-3dB @ 500MHz, 3th order) in microstrip,
coupled lines and interdigital. the first two we have to build and
measure, the 3th one is to calculate only. i know the last two filters
are band pass, but we should design something with highest brakepoint
at 500MHz.

now my question:
we managed to calculate the microstrip filter so that one is done and
simulated. what botters us is that we didn't get ANY sort of a course
(we have to find anything on our own) and we have no clue about the
coupled lines and even less about the interdigital filter.
there is very very little useful information to find on the web so
please can someone help me here by giving some basic
methodology/formulas for coulpled lines or interdigital filters. maybe
someone has a few pdf's or other info on his harddisk he/she could
send me?

thanks in advance
lenx

Hi Lenx,

Try to find 'Stripline Circuit Design' by Harlan Howe, Jr.

Sam

(Lenx) wrote in
m:

hello,
i am a student and we got a hf task for a lab project. we have to
built a low pass filter (-3dB @ 500MHz, 3th order) in microstrip,
coupled lines and interdigital. the first two we have to build and
measure, the 3th one is to calculate only. i know the last two filters
are band pass, but we should design something with highest brakepoint
at 500MHz.

now my question:
we managed to calculate the microstrip filter so that one is done and
simulated. what botters us is that we didn't get ANY sort of a course
(we have to find anything on our own) and we have no clue about the
coupled lines and even less about the interdigital filter.
there is very very little useful information to find on the web so
please can someone help me here by giving some basic
methodology/formulas for coulpled lines or interdigital filters. maybe
someone has a few pdf's or other info on his harddisk he/she could
send me?

thanks in advance
lenx

thanks to all for the reply.
my school has indeed a library where we had a look some time ago.
there's a whole rack full of books on RF design, but most of them that
cover stripline or microstrip are bulky things full of formulas we
don't need.
we're not really looking for such thing, we are looking for a way to
solve the problem with pencil and caculator, esprecially for the
interdigital filter cos we have no clue about that.

so far we started from a 3th order filter with lumped elements and
then converted it to a structure with kuroda elements.
now what we need to find out is how to calculate the dimensions of the
coupled line filter and the interdigital filter, given the kuroda
filter structure. we already managed to do this for the filter with
stubs (the most easy one probably :-)

thanks to all for the reply.
my school has indeed a library where we had a look some time ago.
there's a whole rack full of books on RF design, but most of them that
cover stripline or microstrip are bulky things full of formulas we
don't need.
we're not really looking for such thing, we are looking for a way to
solve the problem with pencil and caculator, esprecially for the
interdigital filter cos we have no clue about that.

so far we started from a 3th order filter with lumped elements and
then converted it to a structure with kuroda elements.
now what we need to find out is how to calculate the dimensions of the
coupled line filter and the interdigital filter, given the kuroda
filter structure. we already managed to do this for the filter with
stubs (the most easy one probably :-)