Telecommunications – Transmitter and receiver at same station – Radiotelephone equipment detail
Patent
1997-05-05
2000-08-15
Cangialosi, Salvatore
Telecommunications
Transmitter and receiver at same station
Radiotelephone equipment detail
455561, H04B 700
Patent
active
061049352
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.
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Jeffries Andrew William
Smith Martin Stevens
Ward Christopher Robert
Cangialosi Salvatore
Nortel Networks Corporation
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