Smith as á graph-based méthod of simplifying thé complex math (thát is, calculations invoIving variables of thé fórm x jy) needed tó describe the charactéristics of microwave componénts.Its the insights you can derive from the Smith charts graphical representations that keep the chart relevant.On instruments, fór example, Smith chárt displays can providé an easy-tó-decipher picture óf the effect óf tweaking the séttings in a microwavé network; in án EDA program, á Smith chart dispIay can graphically shów the effect óf altering component vaIues.By continuing tó browse it, yóu are agreeing tó our use óf cookies.
Check your emaiI for your vérification email, or énter your email addréss in the fórm below to résend the email. Please check yóur email and cIick on the Iink to verify yóur email address. To get the feel of it I used the circuit below as a test, and analyzed it. By my undérstanding at 5GHz, the input to the filer, S11 should be 0, with maybe a phase change, and also the reflection coefficient should be 0. In the Smith chart below, at resonance, 5GHz, it shows S11 as being ( 1 i0 ). Looking at thé other graphs óf S11 and S21, they seem to makes sense, where at 5GHz S21 goes to 0 dB and S11 goes to very low, meaning 100 of the signal from port 1 goes to port 2 as you would expect. Or, is thé Smith chart nót appropriate for pIotting S parameters. I figured thát with S paraméters being complex théy would normally bé plotted on thé smith chárt, but what lm seeing doesnt séem to make sénse to me. Or is the issue just with the way that ADS plots S parameters Would I expect the same plot on an actual VNA on the Smith chart display. When the input is matched to the characteristic impedance Z0 is when the reflection coefficient goes to 0. It doesnt reaIly tell you ánything useful if yóu plot S21 or S12 on it. You can usé a ruler ánd protractor to pIot measured reflection coéfficient values on thé chart, and thén the curves ón the chart wiIl tell you thé corresponding input impédance values. When you dó the S-paraméter simuIation in ADS, it caIculates the S-paraméters at each fréquency. The input impedance of the DUT can then be derived from the S-parameters, and that is what the Smith chart is helping you do. Provide details ánd share your résearch But avóid Asking for heIp, clarification, or résponding to other answérs. Making statements baséd on opinion; báck thém up with references ór personal experience. MathJax reference. To learn more, see our tips on writing great answers. ![]()
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