| 摘要 |
PURPOSE: An improved feed-forward multi carrier power amplifier architecture and a novel array antenna are provided to spatially filter unwanted intermodulation products. CONSTITUTION: An improved feed-forward multi carrier power amplifier architecture provides for independent control of unwanted intermodulation products generated in the amplifier. When used in a novel array structure, a separate radiation lobe containing the unwanted intermodulation products may be steered independently from a main radiation lobe. In a cellular base station application, the radiation lobe containing the unwanted intermodulation products may be steered away from the main radiation lobe thereby providing spatial filtering of the unwanted signals. The radiation lobe containing the unwanted intermodulation products may be steered rapidly in time using, for example, a noise like function to provide statistical averaging of the interference in the direction of desired communications.
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