Discussion Closed This discussion was created more than 6 months ago and has been closed. To start a new discussion with a link back to this one, click here.

Transmission line. Impedance matching

Please login with a confirmed email address before reporting spam

Greetings

I am trying to match a transmission line (microstrip, see picture (A) stub_matching.png) with characteristic impedance Z0 to complex load ZL.
According to the theory it is possible to match the transmission line using a stub (so called "stub matching") which introduces purely reactive impedance. Thus it is needed to place the stub with length _b_ (to match the imaginary part of impedance) at some distance _a_ from the load (to match the real part of impedance) . The stub can be open or short circuited. See picture (B) stub_matching.png. This is theory.

Now I want to match the impedances using microstrip line. And here is the question: there are 4 possibilities to place the stub (see picture stub_matching2.png). Which one is correct?


0 Replies Last Post 4 nov. 2013, 00:59 UTC−5
COMSOL Moderator

Hello Evgeniy Panchenko

Your Discussion has gone 30 days without a reply. If you still need help with COMSOL and have an on-subscription license, please visit our Support Center for help.

If you do not hold an on-subscription license, you may find an answer in another Discussion or in the Knowledge Base.

Note that while COMSOL employees may participate in the discussion forum, COMSOL® software users who are on-subscription should submit their questions via the Support Center for a more comprehensive response from the Technical Support team.