（毕业设计论文）《W波段三倍频器的设计》.docVIP

摘 要 W波段是目前军用毫米波技术开发的高端，频率源是W波段高频系统实现的重要部分。倍频器是实现毫米波频率源的一种重要方式,随着倍频器的发展和应用，倍频器方面的研究也不断地深入，如今倍频技术已经发展到一个新的阶段。 本文对W波段三倍频器进行了设计、仿真。采用两个二极管反向并联的结构实现三次倍频的方案，这种平衡倍频电路结构能够将输入频率的偶次谐波抵消掉，从而大大降低电路中的杂波量。本文运用ADS软件建立二极管对模型并且进行匹配电路的设计，运用HFSS软件对W波段三倍频器的滤波电路和过渡转换电路进行了仿真设计，然后把S参数仿真结果导入到ADS软件中,采用谐波平衡法对W波段三倍频器的整体电路进行仿真和优化以获得最大倍频效率。 经仿真，W频段宽带三倍频器基本达到设计要求。变频损耗在15dB以下，谐波抑制度基本20dBc以上。 关键词：毫米波、倍频器、低通滤波器、W频段三倍频 ABSTRACT Multiplier is one important way to realize the millimeter-wave frequency source. Following the application and development of multiplier device and circuit, the research of multiplier theory is increasing. Today frequency multiplying technology has reached a new level. Firstly W-band frequency tripler has been designed, and simulation. Diodes which constitutes anti-parallel pairs structure was used to realize the frequency tripler. Balanced Frequency tripler can suppress the even-order harmonics so effectively that the amount of clutter has been greatly reduced. In this paper, The model of diode pairs was modeled and impedance matching networks was designed in Agilent ADS. Filter circuit and transition circuit of W-band frequency tripler have been simulation designed in the HFSS, and then import simulated S-parameters into ADS software. Finally, harmonic balance analysis was used to optimize the entire circuit for maximum multiplication efficiency. By the simulation, the W band tripler almost reaches the requirement of the project. the microstrip multiplier performance is better in entire W-band with multiplier loss 15dB and harmonic suppress above 20dBc. Key word: millimeter wave, multiplier, lowpass filter, W-band tripler. 目 录 第一章 引言 1 1.1毫米波的特点及应用 1 1.2 毫米波倍频器介绍 2 1.3 毫米波倍频器的国内外发展动态 3 1.4 课题介绍 4 第二章 倍频电路的基本理论 5 2.1 倍频原理 5 2.2非线性电路的分析 6 2.3平衡倍频器电路设计原理[11] 8 第三章 毫米波三倍频器的设计 10 3.1概述 10 3.2关键技术和难点 10 3.3倍频器的研制方案和设计框图 11 3.4 二极管的选择及参数介绍 12 3.5 波导-微带过渡 13 3.5.1 理论基础 13 3.5.2 输入波导到微带线探针过渡的设计仿真 14 3.5.3 输出微带到波导线探针过渡的设计仿真 16 3.6 低通滤波器的设计 18 3.7总体电路的仿真 20 3.7.1 第一种电路形式的仿真 2