ECE 6130 MIDTERM I

February 22, 1999

Name _______________________________-

You may use your portfolio and a calculator.

1. (35 points) Design a double-stub matching network to match a load with Z_L = 70 + j 80 W to a 50 W line. The stub configuration is shown below.

2. (30 points) Design an L-matching network to match a load with Z_L = 200 W to a 50 W line at 1 MHz. The circuit must pass 200 Hz waves.

Describe:

If the L-matching network is NOT used, LESS power is delivered to the load. Where does this lost power go?

3. (35 points) Find the complete S-parameters of this circuit when it is running at 1 MHz. This circuit is composed of an L-matching network (far left), a section of lossy transmission line, and a bypass capacitor with parallel resistance. This would then be attached to an antenna or other load, but you do not need to know what the load will be in order to compute the S-parameters of this portion of the circuit. There are several ways to do this problem. A numerical solution is optional and NOT required, but you must specify (with specific equations) how to obtain it.

ECE 6130 Midterm I

Problem 1 ________ / 35 point

Problem 2 ________/ 30 points

Problem 3 ________ / 35 points

Total _________ / 100 points