Patent ID: 8058880
Filing Date: 2011-11-15
Classification: G01R,H04B

Abstract:
1. An analyzer 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 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 signal with frequencies F a frequency multiplier connected to the output of the first signal source for multiplying the frequency of the first signal source by two to provide an output of frequency 2F a reference signal mixer having a first input connected to the output of the second signal source, a second input connected to the output of the frequency multiplier and an output providing a reference signal having a frequency of 2F a reference signal passband filter having an input connected to the output of the reference signal mixer and having an output; a reflected signal passband filter having an input connected to the test port, the reflected signal passband filter for providing a reflected signal of frequency 2F a LO signal source for generating a signal with frequency 2F a reference signal downconversion mixer having a first input connected to the output of the LO signal source, a second input connected to the output of the reference signal passband filter and having an output providing a reference test signal; and a reflected signal downconversion mixer having a first input connected to the output of the LO signal source, a second input connected to the output of the reflected signal passband filter and having an output providing a reflected test signal.