【作者】 陈宏巍；

【导师】 房少军；

【作者基本信息】 大连海事大学 ， 通信与信息系统， 2006， 硕士

【摘要】 随着计算机的广泛应用,虚拟仪器技术得到了很大的发展,出现了虚拟万用表,虚拟示波器,甚至是虚拟实验室等虚拟仪器设备,这些设备具有成本低,操作方便,而且是结合计算机,其数据获取精度高和数据处理方便等特点。而随着通信技术的飞速发展,射频技术越来越重要,而对射频仪器的需求也相应地有所增加,考虑到很多情况下,只需测量器件S参数的幅值,因此,本课题结合虚拟仪器技术和射频技术设计了虚拟标量网络分析仪。并重点分析制作了射频部分的模块。 本课题设计的虚拟标量网络分析仪,具有开发维护费用低、可复用和可重配性强、价格低廉、操作方便等特点。在设计方法上,采用“先进行理论分析,然后进行仿真验证,最后制作实现”的思路。在系统的整体仿真上,采用MATLAB的Simulink结合MATLAB的用户界面接口(GUI),进行了系统的整体仿真建模,包括用户界面的模拟,和系统的射频模块的行为级模拟。通过仿真,验证了系统的可行性。在具体的射频模块的设计制作上,我们借助于美国Agilent公司的先进设计系统2003A软件进行射频电路的仿真,极大地降低了电路的调试难度,以及提高了电路的设计精度。同时,借鉴网络分析仪误差校准的思想,设计了本系统的误差校准方案,而这一点恰好可以利用计算机的强大计算功能完成。既提高了测量精度,又节约了成本。 本课题在对虚拟标量网络分析仪的系统进行了设计仿真基础上,重点研究了系统的射频部分。其主要内容包括:一、对电阻功分器和威尔金生功分器进行了理论分析,仿真设计了中心频率为900MHz的威尔金生功分器,并在此基础上利用光子带隙(PBG)扩展了功分器的应用带宽。二、分别对双分支定向耦合器,平行线定向耦合器和兰格定向耦合器进行了理论分析,并制作了微带结构的双分支定向耦合器。三、分析了低噪声放大器的理论设计方法,借助ADS软件设计了噪声系数小于1.6的低噪声放大器。四、分析并设计了850MHz～950MHz的压控振荡器。更多还原

【Abstract】 With the large of application of computer, virtual device technique is developed very much, virtual multimeter appeared, virtual scope appeared, and even virtual laboratory appeared. These devices has their common trait that is low cost, convenient operation, and getting data precisely, deal with data quickly with using computer. Moreover, with communication technique is developing at very fast speed, RF technique is more important, so more RF instrument is needed. Think of that the absolute value of S parametric is enough in most condition, thus, we designed virtual scalar network analyzer, moreover, analyzing and making RF model block is main work in my paper.The character of virtual scalar network analyzer is that the cost of developing and maintenance is low, could be reconfigured, could be used conveniently, etc. the design method is that, it was analyzed firstly in the theory, then simulated for verification, fabricated at last. We used Simulink and GUI of MATLAB to simulate the whole system, after simulation, the feasibility is approved. We used ADS 2003A to simulate RF module, in the fabrication of RF module, it make the circuit design be more simple, and be more precise. Meantime, reference to the thinking of the error calibration in network analyzer, we designed the error calibration in this system. We could achieve it using computer easily, and it could not only improve the measure precise, but also saved the cost.In this paper, besides of the design and simulation of the scalar network analyzer system, the part of RF module is our another important work, it includes: first, we analyzed the resistance power divider and Wilkinson power divider in theory, and made a Wilkinson power divider which has 900MHz center frequency. Moreover, based on this one, we used PBG structure to broad the power divider’s band wide. Second, we discussed the branch-line directional coupler, parallel line directional coupler, and Lange directional coupler in several. And we fabricate branch-line directional coupler in micro strip structure. Third, we analyzed the design method of low noise amplifier, and then made a LNA, and its noise figure is less than 1.6. Fourth, we discussed the method of making VCO, and design a VCO whose frequency is from 850MHz to 950MHz.更多还原