n3x
Newbie level 3
Hello,
I'm using a microstrip quarter wave transformer with an open end connected to a short stub(part of impedance matching for a transistor).
As far as I know a wider microstrip(smaller Z0) for the transformer would result in better bandwidth. However I cannot understand why!
Can you help me with understanding the connection between the bandwidth and the impedance of the line?
I'm currently using "Microwave transistor amplifiers: analysis and design" by Gonzalez, and I don't have access to ieee or similar sites.
Any suggestions would be helpful.
Edit:
From: **broken link removed**
Thanks!
I'm using a microstrip quarter wave transformer with an open end connected to a short stub(part of impedance matching for a transistor).
As far as I know a wider microstrip(smaller Z0) for the transformer would result in better bandwidth. However I cannot understand why!
Can you help me with understanding the connection between the bandwidth and the impedance of the line?
I'm currently using "Microwave transistor amplifiers: analysis and design" by Gonzalez, and I don't have access to ieee or similar sites.
Any suggestions would be helpful.
Edit:
From: **broken link removed**
This is what I'm trying to understand (not that i don't trust microwaves101 )The open circuit stub trick (creating an RF short circuit that is DC-open) is often done with lower impedance lines than Z0. This effectively gives a wider bandwidth. An even better trick is to use a microstrip radial stub; it provides a low impedance, it doesn't suffer from a large distributed tee junction that a constant-width low-impedance stub would, and it just works better (trust us!)
Thanks!