2 c) Consider a 4-port lossless 20 dB coupler. Port 1 is bei…

2 c) Consider a 4-port lossless 20 dB coupler. Port 1 is being used as the input port and Port 4 is the isolated port. Port 2 is the coupled port. The coupler has perfect (infinite) isolation. The input reflection coefficient is -30 dB. If the coupler is reciprocal, can you find S13 (in dB) ? ( Hint: You can use the equation below for solving for the intermediate steps to your calculation).

Problem 4 Setup  Assume you are testing a mixer using the t…

Problem 4 Setup  Assume you are testing a mixer using the test configuration above. And that you have measured the spectral response at the output of the mixer and have corrected  for the IF output cable and pad at all frequencies.  Now you want to compare your data to what may be expected from manufacturer provided information for the mixer, so your next step is to estimate the power levels expected at various frequencies.  In looking at the manufacturer provided information for this mixer, there is no intermodulation table (or harmonic table) information for the same frequencies we want to use. However, there is one setup for a different set of frequencies and power levels  as provided below Note in the intermodulation table above all values are in dBc values below the carrier except where indicated with a “+” sign. For each part below – assume that this same relative intermodulation table above applies to the frequency and power setup that we want to use (RF is -13 dBm @ 1900MHz; LO is +13 dBm at 1930 MHz) .