1 / 17

Prof. David R. Jackson Dept. of ECE

ECE 5317-6351 Microwave Engineering. Fall 2011. Prof. David R. Jackson Dept. of ECE. Notes 3. Smith Chart Examples. Example 1. Find Z (- d ). Impedance chart. a. Example 1 (cont.) . b. c. Example 2. Find Y (- d ). Admittance chart. a. Example 2 (cont.) . b. c.

mauve
Télécharger la présentation

Prof. David R. Jackson Dept. of ECE

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. ECE 5317-6351 Microwave Engineering Fall 2011 Prof. David R. Jackson Dept. of ECE Notes 3 Smith Chart Examples

  2. Example 1 Find Z(-d) Impedance chart a

  3. Example 1 (cont.) b c

  4. Example 2 Find Y(-d) Admittance chart a

  5. Example 2 (cont.) b c Admittance chart

  6. Which Chart to Use? Simple answer: * When adding elements in series use Z-chart * When adding elements in parallel use Y-chart

  7. Using Reactive Loads Non-absorbing load (RL = 0)  Use reactively loaded section of transmission line. most common to use open or short load Impedance chart Reactance

  8. Using Reactive Loads (cont.) Susceptance Admittance chart

  9. Example 3 Use a short-circuited section of air-filled TEM, 50  transmission line (= k0, g =0) to create an impedance of Zin = -j25 at f = 10 GHz. Impedance chart L = 1.28 cm

  10. Example 4 Use an open circuited section of 75  (Y0 = 1/75 S) air-filled transmission line at f =10 GHz to create an admittance of Admittance chart

  11. Matching Circuit Admittance chart Want to pick d and Ys such that Yin = Y0. Note: At d we have

  12. Matching Circuit (cont.) We want Choose Admittance chart

  13. d Z0 ZL Z0s ls Example 5 In this example we will use the “usual” Smith chart, but as an admittance calculator.

  14. Example 5 (cont.) Admittance calculator (We’ll use the first choice.) plane X SC OC X X Smith chart scale: wavelengths toward load wavelengths toward generator

  15. Example 5 (cont.) Admittance calculator From the Smith chart: Analytically: X

  16. Quarter-Wave Transformer At f0 : For in = 0

  17. Example 6 Match 100  load to 50  transmission Line at f0.

More Related