S波段混频器的研究
毕业论文 关键词：混频器 设计 仿真
Title S-band mixer Abstract Mixer is the modern radar, electronic countermeasures, guided weapons, wireless communications, and many other vital components in microwave measurement system. In order to improve the sensitivity and gain of the receiver, are generally need to rf signal after mixing into a low frequency of intermediate frequency signal for further processing. Mixer circuit can be composed of diodes, transistors, or field effect tube, mixing is actually a spectrum of the linear moving process, is the high frequency of input rf signal through a nonlinear device into the low frequency output of the intermediate frequency signal. This paper on the working principle and performance indexes of microwave mixer is introduced in detail. Then puts forward four kinds of different structure of the mixer, they respectively are single-ended mixer, single balanced mixer, double balanced mixer and both balanced mixer. Has carried on the simple introduction about the structure of their, and compares their characteristics. Next, has carried on the simulation to microwave mixer is designed. First 3 db directional coupler, the diode is designed input and output impedance matching circuit, two diodes, output bandpass filter. Then simulated for mixer as a whole, some technical parameters has been measured, in accord with the requirement of project.
Keywords ：The mixer design simulation
1绪论 . 1
1.1 课题的研究背景及意义 1
1.2 国内外发展动态 1
1.3 本文的主要工作 3
2 混频器的原理 4
2.1 肖特基势垒二极管的结构 .. 4
2.2 二极管的等效电路 .. 5
2.4本章小结 8
3 混频器的技术指标 . 8
3.1 噪声系数 8
3.2 变频损耗 . 10
3.3 动态范围 . 12
3.4 双频三阶交调与线性度 . 13
3.5 工作频率 . 14
3.6 隔离度 .. 15
3.7 本振功率与工作点 15
3.8 端口驻波比 16
3.9 本章小结 . 16
4 二极管微波混频器 .. 16
4.1 单端口混频器 .. 17
4.2 单平衡混频器 .. 18
4.3 双平衡混频器 .. 19
4.4 双双平衡混频器 . 20
4.5 本章小结 . 21
5 S波段混频器的 ADS仿真 . 22
5.1 混频器的技术指标 22
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