Antenna system
US4994813A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 13, 1989 |
| Grant date | Feb 19, 1991 |
| Priority date | — |
| Expiry date | Oct 13, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01Q21/293
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A phased array antenna includes a plurality of first antenna elements and a plurality of phase shifters respectively connected to the first antenna elements. An amplitude and a phase of each of the antenna elements are determined by a method of opposing a pick-up antenna at a distance from the phased array antenna to measure a composite power of the phased array antenna while changing phases of the phase shifters for determining the ratio of the maximum power to the minimum power, and the phase value for the maximum power, from which the amplitude and phase are computed. A second antenna element is incorporated in the phased array antenna as a pick-up antenna to measure with mutual coupling an amplitude and a phase of each antenna element by the method and to determine differences in amplitude and phase between the opposed pick-up antenna and the second antenna element so that an amplitude and a phase subsequently measured with the second antenna element are corrected with the differences in amplitude and phase to determine an amplitude and a phase of each antenna element.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.