System and method of testing for passive intermodulation in antennas
US6144692A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 7, 1998 |
| Grant date | Nov 7, 2000 |
| Priority date | — |
| Expiry date | Apr 7, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R29/10
- WIPO fieldMeasurement
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.