Microwave video distribution system and adaptable microwave transmitter
US5920813A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 28, 1995 |
| Grant date | Jul 6, 1999 |
| Priority date | — |
| Expiry date | Aug 28, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N7/20
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In a cell of a microwave cellular video distribution system, e.g a multichannel video distribution system operating at frequencies of around 29 GHz or 40 GHz, the transmitting antenna is composed of individual antenna sectors (62a,62b,62c . . . ) for transmitting the microwave signal towards different sectors (216a,216b,216c . . . ) of the cell. In accordance with the present invention, a respective monitor (D,R) is present in each of the different sectors (216a,216b,216c . . . ) of each/the cell to monitor the microwave signal transmitted in that sector. The antenna sectors (62a,62b,62c . . . ) are individually fed through controllable feed means (59,60,61) which permit individual control of the power level of the microwave signals transmitted by the individual antenna sectors (62a,62b,62c . . . ), including the switching off of that sector. A feedback coupling (40,44,49) is present between each monitor (R,D) and the controllable feed means (59,60,61) of the respective antenna sector (62a,62b,62c . . . ) to control individually the power levels transmitted towards the different sectors (216a,216b,216c . . . ) of each cell. In this manner the transmission pattern in each cell can b…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.