| 摘要 |
In a system for feeding electric power having a carrier band for a mobile communication base station including transmission power amplifiers and an array antenna, a transmission/reception system is capable of reducing a large loss which the transmission electric power suffers until the transmission electric power having a large output has been radiated into the air, and increase in the power consumption. The system includes a plurality of transmission/reception signal amplifying devices, which are respectively coupled to a plurality of antennas, in each of which a feed forward power amplifier which is realized with less electric power than the total electric power which is to be radiated from the associated antenna into the air, and a low noise amplifier are respectively coupled to the associated antennas through a transmission filter and a reception filter, wherein an output of a power detector connected to an output portion of the feed forward power amplifier is compared with a control signal of a tilt angle control circuit to adjust, every feed forward amplifier, the phase shift amount of a variable phase shift circuit inserted into an output portion of the feed forward power amplifier while referring to a phase shift amount table which is constructed on the basis of the characteristics of the feed forward circuit.
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