Experiment 4 : Matching Impedance

    Result

     First part

     V_max =                        mV ,   P_max =                            mW

     V_min  =                        mV ,   P_min  =                           mW

     Calculated the m, s, ρ² and ρ with the measured values (with the aid of experiment 3).

     Second part

     You need a guide wavelength of λ_H for the second experiment. As you are using the frequency for the micrometer 

     screw setting at 1.25 mm, the λ_H can be taken from experiment 2.

     Draw the m circle as in Figure 12 below  which you have established in the first part of the experiment. Point A, for 

     example, which results from point of intersection of the measured, m circle with the value l/ λ = 0.11 may serve 

     as stating point for further calculations.

     Calculated the value of the line length, l_AB to reach a point B on the m-circle from which transformation can take 

     place to point 1 (ideal matching) with a series C.

     l_AB =                             cm

     A point C could be reached with longer line section from which a direct matching could be achieved with a series L. 

     Calculated the length of this line to get from A to C.

     l_AC =                             cm

     Calculated the line sections with the aid of the guide wavelength, λ_H and the ratio l/ λ from figure 12  below.

     l/ λ_AB =                         cm,  l/ λ_AC =               cm

 

 

Figure 12: Smith Chart diagram for calculating the matching

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