ECE 6180  Midterm I (Transmission Lines)      Feb. 15, 2002

 

Name _____________________________

 

You may use your portfolio and calculator.  No textbooks.


 

1.        (33 points) Double Stub matching networks

Design a double stub matching network to connect a load that is 10-j15 ohms to a 50 ohm line.  Use 50-ohm short-circuited parallel stubs.  The distance between the load and first stub is 0.1wavelengths.  The length of 50-ohm line between the stubs is 0.125 wavelengths.  Sketch your final design, labeling all lengths.

 

 

2.        (33 points) L matching

  1. Design an L-matching network to connect a load that is 200 ohms  to a 50 ohm line.  Use a high-pass design. 
  2. For a frequency of 1 GHz, specify the C and L values.  Sketch your final network.
  3. Sketch a circuit to match a load that is 200 + j 100 ohms.   (You may use either resonance or absorption, whichever is easier.)

 

 

 

 

3.        (33 points) S Parameters

Specify the S-matrix for an LC filter in series with a quarter-wave transformer as shown.  You may use any method.  It is not necessary to compute the values of the S-matrix, but show how to do all necessary computations. 

 

 

ECE 6180 Midterm I

 

Name ___________________________

 

Problem 1 ________ / 33 points

 

Problem 2 ________ / 33 points

 

Problem 3 ________ / 33 points

 

                  + 1 point

 

Total         ________ / 100 points