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美国海军研究实验室找到一种新奇的解决方案从相控阵天线产生波前.相控阵天线由许多相干馈电静态天线单元构成,恰当控制到达各天线元的射频电波,可以产生一个或多个波前.此外,最后形成的波前,即波束还可以改变其位置,即可以电扫.通过引入一可变相位或延时,即可获得对到达天线元的波的控制.由于相控阵天线有成百上千个元,采用分立的可调相移器从经济上看是不可取的.改变信号到达天线元所走路径的电路径长度也可以引起延时,但改变脊波导长度或铜芯线同轴电缆的长度也决非易事.这种情况通过应用光纤有所改善.光纤比上述方法好得多,
The US Naval Research Laboratory has found a novel solution to create wavefronts from phased array antennas that are made up of many coherent-fed static antenna elements that properly control the RF waves that reach each antenna element to produce one or more In addition, the resulting wavefront, that is, the beam can also change its position, that is, can be electrically scanned by introducing a variable phase or delay, you can get the control of the arrival of the antenna element of the wave due to the phase control There are hundreds and thousands of array antennas and it is not economically desirable to use a separate tunable phase shifter.Altering the electrical path length of the signal path to the antenna element can also cause delays but changing the ridge waveguide length Or copper core coaxial cable length is by no means easy things.This situation has been improved by the application of optical fiber.Compared with the optical fiber is much better,