Down link beam forming architecture for heavily overlapped beam configuration
US6104935A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 5, 1997 |
| Grant date | Aug 15, 2000 |
| Priority date | — |
| Expiry date | May 5, 2017 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02D30/70
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An antenna beam forming for generating a plurality of broad overlapping radiation beams for a cellular radio application comprises an antenna array having a plurality of individual antenna elements, each individual antenna element connected by a cable to a respective diplexor, each diplexor fed by a multi-channel power amplifier receiving an input from an output port of an eight way Butler matrix. Transmission signals are input to seven input ports of the Butler matrix, and output transmission signals are produced at four of the output ports of the Butler matrix. A remaining four output ports are each terminated with a respective matched load. A 3 dB power loss incurred in the Butler matrix is compensated by provision of a plurality of pre-amplifiers prior to the input ports of the Butler matrix, with the power amplification stage being carried out on the outputs of the Butler matrix. Side lobe suppression is maintained by ensuring phase and amplitude integrity across the output channels. A set of phase and amplitude adjusters operate on the output transmission signals from the Butler matrix output ports. The phase and amplitude adjusters may be electronically controlled.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.