Firstly, thank you very much for reading this question!
Now I am designing a T junction build-up with the transmission line. I find that I have to design this T junction within a dimension less than 1/4λ, but I have seen that I have to consider the transmission line effect when the electrical line pattern is >1/4λ (someone even says> 1/10λ)， and I do have seen some transmission drops for my interested band in simulation, seems like I have to do something with impedance matching.
Usually, we have those impedance matching schemes with 1/4 λ length(Quarter-wave impedance transformer), but they are too long for me. My question is, do we have any choices that we can achieve impedance matching with a smaller size impedance transformer?
Thank you all very much for the information and the ideas!
the lamda/4 option is one possible way..but the other (classical) narrwand way for matching is a combination of L and C .You can very nicely practice this in the Dellsperger Smith Chart (free interactive software easy to use)
If the lambda/4 option is too long, I assume you work with relatively low frequencies. A transmission line which is close to lambda/4 length is indeed masking quite a lot the load impedance (I tend to agree with the > 1/10λ criterion). For this range of problems, I would look at LC matching boxes. According to the load value, you can choose the type of LC circuit (L series and C parallel, for example) to design and the related values. These will work only for that load value, and only for that frequency.
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