| 摘要 |
Microwave variable power divider, comprising (Fig. 1) a 3 dB directional coupler (1) (called hybrid circuit), followed on one output leg by a variable phase shifter, obtained by assemblying a -3dB directional coupler (2) with its outlets closed on movable short-circuits (6; 7) that can ensure its variability, and on the other by a 90-degree differential phase shifter (5) and an analogous variable phase shifter consisting of directional coupler (3) and movable short-circuits (8; 9), followed by another directional coupler (4). The device makes it possible to vary the power on the two output legs (12; 13) in a complementary manner by regulating the movement of the movable short-circuits. The particular solution proposed allows the use of a planar-type technology, which can assure considerable advantages in terms of construction, dimensions and integration in more complex networks. In addition, the operating bandwidth (>/= 16%) associated with low losses (0.15 dB) and minimal inband variation of amplitude at the outputs in relation to any desired power division value constitute the peculiar characteristics of this device. Lastly, the low level of passive intermodulation products allows the device to operate in multicarrier systems and the particular movable short-circuit solution adopted allows it to be used for medium-high powers (300 W in continuous wave radiofrequency). The technical field in which this invention is situated is that of passive microwave components and its application field is that of microwave systems in which it is necessary to vary the amplitude and phase of the output signals. <IMAGE> |
