Implementation of series stub(open or short) using microstrip

[Palpurul]

I am sure many of you have seen shunt stub built using microstrip line on a pcb, but what about series stubs? It seems to me it is physically impossible. Is there anyway to build series stub matching network on a pcb?

 

[biff44]

coupled lines, with various opens or shorts at the ends, can be used. Usually less than a quarter wave at midband.


look around page 220 in mathei young and jones for approximate model ideas (these are TEM models, but are similar to the microstrip ones)
**broken link removed**

 

[ferdem]

Series stubs are converted to shunt stubs using Kuroda identities, they are equivalent. The reason is what you point, impossibility or difficulty. Microstrip series stub looks impossible.

 

[Palpurul]

coupled lines, with various opens or shorts at the ends, can be used. Usually less than a quarter wave at midband.

look around page 220 in mathei young and jones for approximate model ideas (these are TEM models, but are similar to the microstrip ones)
**broken link removed**

Thanks for sharing such a great document. I see that it's not impossible but not straightforward too.