Experimental Setup:

Objective:

To build, measure, and analyze the behavior of low-pass filters at high frequencies.

Procedure:

Using the network analyzer and the S-parameter test set, measure the insertion loss of the following filters in a 50 Ohm system:

1. a 470 pF capacitor in parallel with the load
2. a 2.2 microHenry inductor in series with the load
3. a T-filter constructed with two 2.2 microHenry inductors and a 470 pF capacitor

Use your measurements of the capacitor and the inductors to develop an equivalent circuit model for these devices that accounts for the lead inductance of the capacitor and the interwinding capacitance of the inductors. Use the equivalent circuit for each device to develop an equivalent circuit for the T-filter. Compare the measured response of the T-filter to the expected response based on your equivalent circuit.

Results:

1. For each filter, plot the ideal(calculated)insertion loss as a function of frequency (0.3 - 500 MHz) using a solid line.
2. On the same plot, show the measured insertion loss and the insertion loss predicted by your equivalent circuit.
3. For this lab, assume that your engineering manager asked you to develop these models. Your report should be in the form of a brief memo to your manager with three plots attached. Any significant deviations between your model and the measured results should be explained in the memo.