fertgr.blogg.se - Using a smith chart

USING A SMITH CHART HOW TO
USING A SMITH CHART SERIES

We can fairly accurately read the locations of all 4 points in the Smith chart: 12 Type #4 impedance matching Step 1, Option #1, #2, #3, and #4 We cal them Option #3 and Option #4 respectively.įig.

USING A SMITH CHART SERIES

The other 2 options add an inductor in series to move the reactance \(x\) along the \(r=0.5\) circle until meeting \(g=1\) circle at points O3-S1 & O4-S1. We call them Option #1 and Option #2 respectively. There are 4 options to satisfy this first rule and the first 2 options add an inductor in shunt to move the susceptance \(b\) along the \(g=0.4\) circle until meeting \(r=1\) circle at points O1-S1 & O2-S1. 10, we can simultaneously read the impedance \(z\) and admittance \(y\) of point X:įollow the first basic rule of impedance matching, add a lossless element, capacitor or inductor, to get the real part of either impedance or admittance to be 1. 10 Read Type #4 impedance in the Smith chartĪs showed in Fig. Locate the impedance \(z=r+jx\) and admittance \(y=g+jb\) in the Smith chart, point X.įig. If the impedance is \(Z=R+jX\), then the normalized impedance is \(z=Z/50=r+jx\).ģ.

USING A SMITH CHART HOW TO

If return loss \(S_\) or reflection coefficient \(Γ\) is given by datasheets, then refer to this article Smith Charts-Basics, Parameters, Equations, and Plots to learn how to convert the number to impedance.Ģ. The process to match a Type #4 impedance into 50Ω:ġ. Type #3 impedance is located within the shaded area in the Smith chart.įig. Only after finishing reading the sequence and knowing all basics, you then can use this skill effectively. However, if you are vague to the Smith chart then you should STOP here and go back to learn the Smith Chart Basics first. We’ll continue to learn how to match Type #3 and Type #4 impedance below.

Add the second lossless element to tune out the remaining imaginary part, reactance or susceptance, so the resultant impedance or admittance is a real number 1 (\(z=1+j0\) or \(y=1+j0\)).

Add a lossless element, capacitor or inductor, to get the real part of either impedance or admittance to be 1.

The very basic RULES of impedance matching are: The only thing you need to do is enter S11 or to-be-matched impe dance and you’ll get the approximate result by following all steps. In the part I, you’ve learned the step-by-step guide to match Type #1 and Type #2 impedance by simply using Smith chart without knowing those formulas. Impedance Matching-Using Lump Elements, Formulas, and Conversions-Part II. Impedance Matching-Using Lump Elements, Formulas, and Conversions-Part I. We have learned the impedance matching for all 4 Types of impedance using formulas & their conversions, and it’s recommended to visit these 2 articles before you continue to read further here: