Calibrated two port passive intermodulation (PIM) distance...

Electricity: measuring and testing – Fault detecting in electric circuits and of electric components – For fault location

Reexamination Certificate

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C324S076390, C324S639000

Reexamination Certificate

active

08058880

ABSTRACT:
A PIM measurement circuit enables making forward and reverse PIM measurements on any 1 port (reflection) or 2 port (transmission) device with the ability to determine in distance where individual PIM impairments are located as well as their magnitude. The PIM measurement circuit includes two frequency sources that are provided through a combiner for a CW characterization of the PIM circuit. To enable distance determination, an FM measurement is created by using a saw tooth offset sweep generator attached to one of the two frequency sources. With downconversion and processing of signals from the PIM impairments, the FM signal provides a frequency variation that is converted using a Fourier transform or spectrum analysis for separation of frequencies, enabling determination of the distance of the PIM sources as well as their magnitudes.

REFERENCES:
patent: 2003/0232600 (2003-12-01), Montgomery et al.
patent: 2009/0096466 (2009-04-01), Delforce et al.
patent: 2009/0125253 (2009-05-01), Blair et al.
patent: 2010/0295533 (2010-11-01), Kuga et al.
patent: WO 03/030416 (2003-04-01), None

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