1_230 Lab Manual Winter2016.pdf

Analysis 1 in this experiment you only had control of

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Analysis 1. In this experiment, you only had control of the length of the stub, namely the distance from the load was fixed. In general, if you were to design a matching circuit using a single stub tuner, you would be able to choose both the length of the stub and the distance from the load. Compute the theoretical parameters of the single stub tuner. Compute the normalized impedance z l of the unknown load (Z 0 = 50 Ω). Enter this point on a Smith Chart and label it as A . Draw the constant SWR circle that passes through A . Label the point on the Smith Chart that corresponds to the normalized load admittance y l = 1/z l as point B . Compute the required distance, d, between the load and the stub in terms of wavelengths (f = 600 MHz, ε r = 1). Label the point on the Smith Chart where the constant SWR circle meets the g=1 circle as point C and record the corresponding admittance. Determine the input admittance of the stub, y stub , that is required to cancel out the imaginary part of y C . Label this as point D on the Smith Chart. Mark the point on the Smith Chart that corresponds to the admittance of a short circuit as point E . Determine the length of the stub in terms of wavelength by finding the distance between points D and E on the Wavelengths Toward Generator (WTG) scale. Compute the physical length of the stub. Is this length uniquely determined? Why or why not? 2. Compare the experimentally measured stub length to the theoretical one and comment on the results. 3. Compute the input impedance of the theoretical circuit (matching circuit and load) and compare it to the measured impedance after matching.
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45 Questions 1. Were you able to achieve a perfect match with the single stub? If not, why not? 2. Would a quarter wave transformer have achieved a better match for the unknown load? Why or why not? 3. Suggest a way that you could use a stub and a quarter wave transformer to achieve a better match than with either of them alone. IX. [email protected] [email protected] For each experiment of the Lab Exercise, include the following items in your postNlab writeNup: Measured data Calculations (show your work and the equations that you used) Tables, printouts, and Smith Charts Answers to Analysis and Questions (excluding those that were part of the PreNLab)
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46 Lab Exercise 3: Magnetically Coupled Circuits Objective The objective of this exercise is to familiarize students with magnetically coupled circuits and present techniques for their analysis. General concepts to be covered: Magnetic coupling and mutual inductance Coupling coefficient, input impedance, equivalent inductance, TN and ΠNequivalent circuits Stored magnetic energy I. [email protected] Assignment 1. Read the material in the following pages.
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  • Winter '08
  • RAND
  • BNC

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