Radiometry system with an aperture synthesis type antenna and its application to hyper-frequency imaging
US6307502A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 29, 1999 |
| Grant date | Oct 23, 2001 |
| Priority date | — |
| Expiry date | Dec 29, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01Q21/064
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A radiometry system including an aperture synthesis antenna array type, including plural antenna elements, distributed in an antenna plane relative to at least one axis, according to a determined law. Each antenna element includes first and second coupling probes sensitive to hyper-frequency electromagnetic signals with dual linear polarization in quadrature (arbitrarily referred to as horizontal and vertical polarizations). The probes are connected two by two with electric receiving circuits to create a synthetic aperture. The horizontal (f.sub.H1 -f.sub.H4) and vertical (f.sub.V1 -f.sub.V4) coupling probes of successive antenna elements (e.sub.A1 -e.sub.A4) are oriented in the antenna plane (At'), along each of the axes (.DELTA.), such that at least one of the horizontal or vertical probes (f.sub.H1 -f.sub.H4, f.sub.V1 -f.sub.4) presents a 180.degree. phase shift from one antenna element to the other (e.sub.A1 -e.sub.A4), with the phase shift obtained by a sequential 90.degree. rotation of those probes (f.sub.H1 -f.sub.H4, f.sub.V1 -f.sub.V4). Further, 180.degree. phase shifts (.PHI..sub.H2, .PHI..sub.V3, .PHI..sub.H4, .PHI..sub.V4) are applied onto the outputs of the horizontal …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.