If you were to place component such as a capacitor in series with this new impedance that you found, it should be fine.
SMITH CHART STUB MATCHING PLUS
The problem with using the method you suggest is that if you move the impedance first, you will indeed have 50\$\Omega\$ in the real part plus some other term as the imaginary part, but remember that the stub you are placing is going to be in parallel with the load. I'd appreciate a lot if anyone can help me with these issues! The Smith Chart is a clever tool for analyzing transmission lines The outside of the chart shows location on the.
The impedance matching can be simplified by using a Smith chart which is an easy-to-use tool. The only options to satisfy this first rule is add a capacitor, Option 1, or an inductor, Option 2, in series to move the impedance along the circle until meeting circle at points O1-S1 & O2-S1.
SMITH CHART STUB MATCHING GENERATOR
I mean, starting from the source reflection coefficient, and moving to the generator, the first element would be the transmission line, that is in series, so why change the impedance to admittance? Wouldn't be more logic to move from the plotted impedance to the 50ohm impedance circle, and after that, change from impedance to admittance, and then cancel the imaginary part with the shunt stub?Īppart from that, I can't understand clearly that, having a generator (source) and a load (Z0), when moving from the transistor towards the generator, the movement sense in the smith chart is towards load. Impedance Matching with Lumped Elements (L-networks). Having the ability to design these matching circuits on the fly. So that the matching circuit should be obtained with the following criteria in the Smith Chart:Īnyway, what I can't understand is this criteria. Overview of stub tuning examples using the Smith chart to match RF lines to various loads. The circuit to be matched is the following one:Īs I don't have the impedances in the transistor, but the reflection coefficients, Pozar suggests to see the circuit as follows: This video demonstrates the calculation of location and length of single stub for achieving impedance matching using smith chart. Single stub impedance matching requires the stub to be located. I'm reading Pozar's Microwave Engineering, more specifically stub adaptation in the Smith Chart. What are the difficulties in single stub matching The difficulties of the smith chart are. I'd like to clarify some concepts about microwaves that I still can't understand it at all.
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