System and method of testing for passive intermodulation in ante

Details System and method of testing for passive intermodulation in ante System and method of testing for passive intermodulation in ante

1998-04-07

2000-11-07

Chin, Stephen

Pulse or digital communications

Spread spectrum

370252, 455 671, 343703, H04R 1500

Patent

active

061446920

ABSTRACT:
A system and method of testing for passive intermodulation in antennas includes circuitry for generating at least two distinct frequencies. A pulse phase modulator modulates each frequency with a random pseudo-noise sequence to produce respective broad band spread spectrum signals. At least two test antennas receive the respective broad band spread spectrum signals and transmit the signals through free space, where they are reflected into another antenna and receiver, which includes a demodulator for despreading broad band spread spectrum signals. Respective pseudo-noise sequences are generated as in the pulse phase modulator at a predetermined delayed time and mixed with the broad band spread spectrum signal to despread the broad band spread spectrum signals and obtain the desired signal information relating to passive intermodulation produced from the test antenna.

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D. Burkhart, "Intermodulation and Crossmodulation Measured Automatically from 25 to 1000 Megahertz," News from Rohde & Schwartz, vol. 16, No. 74, pp. 7-10, 1976.

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