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Implementation of series stub(open or short) using microstrip

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Palpurul

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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?
 

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**
 

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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.
 
biff44 said:
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**
Click to expand...

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

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