Antenna apparatus
US6778147B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 23, 2003 |
| Grant date | Aug 17, 2004 |
| Priority date | — |
| Expiry date | Jan 23, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S7/4008
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
To realize an antenna apparatus capable of measuring a calibration factor accurately and further, capable of estimating an arrival direction of a received signal by composing a calibration circuit by using a directional coupler. The antenna system includes L-number of branch units, a calibration circuit and an operating unit. Each directional coupler composing the calibration circuit is structured symmetrically. Measuring the received signals Yti, i−1 and Yti, i+1 of i−1th and i+1th receivers, respectively, when an ith transmitter transmits a signal, on the basis of the first branch unit, the operating unit calculates a calibration factor at the ith branch unit as Hi=T1Ri/(TiR1)=Yt12Yt23−Yti−1,i/Yt21Yt32−Yti,i−1.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.