It is transparent in a region from the visible to the infrared range ( 0 . 45 - 13 ? m ) and has a fitful birefringence and a large nonlinear coefficient . aggas2 crystal can be made to be octonary device , difference - frequence device and parametric oscillator , and laser sources of different frequences in 1 . 8 - 11 ? m band can be provided 其紅外透波范圍寬( 0 . 45 - 13 m ) ,具有適宜的雙折射率和大的非線(xiàn)性系數(shù),可制成倍頻、差頻和光參量振蕩器件,在1 . 8 - 11 m范圍內(nèi)可提供多種頻率的激光光源。
It is presented that the theory and the manufacturing technology of such analog phase shifter , which are made from conventional 3db quadrature hybrids coupler with two identical varactor - diode networks to provide a shifted phase that varies continuously with biased dc voltage . several analog phase shifters have been made for different operating frequencies . each phase shifter has phase range more than 180 , return loss better than - 20db , insertion loss 4 . 8db including 3db attenuator , transmission difference less than0 . 075 db . computer code phases . bas can present the referenced component values 介紹了利用鐵氧體磁環(huán)制作窄帶3db耦合器的原理和方法,詳細(xì)分析了利用此耦合器設(shè)計(jì)制作模擬壓控移相器的理論和制作技巧,以及所制作的多種頻率的壓控移相器的測(cè)試技術(shù)指標(biāo)和實(shí)際運(yùn)行情況。