Patent ID: 8294469
Filing Date: 2012-10-23
Classification: G01R,H04B

Abstract:
1. An apparatus for measuring passive intermodulation (PIM) comprising: a signal sweep generator; a first signal source providing a signal with a first frequency F a second signal source providing a second signal with a second frequency F a first signal combiner having a first input connected to the first signal source, a second input connected to the second signal source and an output providing a signal combining the first signal and the second signal to provide an output with frequencies F a receive signal bandpass filter connected to the test port, the receive signal passband filter for providing a test signal from the test port; a LO signal generator; a test signal downconverter having a first input receiving the output of the receive signal bandpass filter, a second input connected to the LO signal generator and a test signal output enabling analysis of the sweep signal to determine a distance to the PIM source; a harmonic signal generator connected to receive the output of the first signal source and the second signal source and having an output providing harmonics of a combination of signals from the first signal source and the second signal source; a reference signal bandpass filter having an input connected to the output of the harmonic signal generator; and a reference signal downconverter having a first input connected to the output of the reference signal passband filter, a second input connected to the output of the LO signal generator, and an output providing a reference signal output enabling analysis of the sweep signal to determine a distance to the PIM source.