摘要
针对宽带毫米波成像系统需求,为实现上变频所用大带宽、高灵敏度电光调制器,对毫米波上变频接收前端光子学集成设计与优化进行了研究。对W波段上变频接收前端各部分进行了场分布分析,用HFSS软件对设计的毫米波共面波导结构进行电磁仿真,讨论了缓冲层厚度、电极高度和电极间距等结构参数对性能的影响,通过结构参数调整获得了优化的性能,并设计了射频模块。设计的W波段电光调制器半波电压理论值低于7V,导体损耗小于0.17dB/(cm·GHz1/2),介质损耗小于0.01dB/(cm·GHz),优于国外当前同类调制器水平;矩形波导-共面波导传输损耗小于1dB;双极切比雪夫滤波电路获得中心频率在77GHz的7GHz带通滤波特性。以此为基础集成的上变频接收前端具有损耗低、体积小、便于应用等优点。
For the requirement of broadband millimeter-wave imaging system, the design and optimization of millimeter wave frequency receiver front-end were studied to realize the electricoptic modulator with high bandwidth and high sensitivity for up-conversion. Each part of the W-band frequency receiver front end was analyzed. The electromagnetic simulation was carried out for millimeter-wave coplanar waveguide designed by HFSS software. The effect of structure parameters on performance was discussed, which were the thickness of buffer layer, height of electrode and distance between electrodes. The optimal performance was obtained by adjusting the structure parameters. The radio frequency module was designed. The designed W-band electro-optic modulator has a half-wave voltage below 7 V, and conduction loss was lower than 0. 17 dB/（cm＊ GHz1/2） and dielectric loss was lower than 0. 01 dB/（cm ？ GHz） , which are better than other similar modulators. The S2／ of the designed rectangle waveguide-CPW transition is lower than 1 dB; the two-pole Chebyshev filter is designed at 77 GHz with 7 GHz bandwidth. The frequency up-conversion receiving front-end based on these parts has advantages as low loss and small volume,and is convenient for application.
出处
《上海航天》
CSCD
2017年第1期11-19,共9页
Aerospace Shanghai
基金
国家自然科学基金资助(11673079)
上海航天创新基金资助(SAST2015090)
关键词
W波段
毫米波成像
上变频
电光调制器
接收前端
光子学集成
结构参数
性能优化
W band
millimeter wave imaging
optical frequency up-conversion
electricroptic modulator design
receiving front end
integrated photonics
structure parameter
performance optimization
