六端口测距系统射频前端研究与设计

发布时间：2018-03-31 11:32

  本文选题：六端口技术　切入点：射频前端　出处：《南京航空航天大学》2014年硕士论文

【摘要】：基于六端口技术的零中频接收机在无线通信领域中得到越来越广泛的运用,利用六端口解调技术将射频接收信号直接解调到基带信号,一方面A?D器件不需要工作在射频的频段,另一方面也避免了使用鉴相器等昂贵的微波器件,由于这些优点,我们对六端口测距系统射频前端进行了研究和设计,并对构成前端的超宽带Vivaldi天线,六端口结,本振源等主要部件进行了设计。本论文的工作内容及创新点主要包括以下几个部分:1,六端口接收机系统的分析与研究,综合分析了各种接收机的优劣点,在此基础上阐述了直接变频接收机采用六端口技术的原理与优势,推导了六端口技术的解调公式,并在最后提出了六端口技术在短距离微小移动距离测量的运用,对测距的原理和解调方法作出理论的推导。2,六端口系统中最为核心的六端口结,本文设计了基于Wilkinson功分器和耦合器的微带结构的六端口结,仿真了由一个Wilkinson功分器和三个耦合器组成的六端口结结构,工作频带在5.6GHz-6.2GHz,并对其进行了仿真和实物加工,仿真和实测数据吻合,在整个频段内仿真数据1,2两端口的传输损耗系数优于-7dB,四个输出端口的相位差在频段内保持稳定,测试数据中两端口传输损耗系数优于-7.5dB,本振与射频端口隔离度优于-20dB。3,超宽带Vivaldi天线的设计,设计了两款超宽带Vivaldi天线,工作频率是4GHz-11GHz,两种结构分别为传统的Vivaldi天线和新型的Vivaldi天线,在传统的Vivaldi天线设计基础上,针对天线在低端和高端频率处的增益下降,分别采用了矩形缝隙和零折射率超材料结构加载的方法提高了天线在低端和高端的增益,并对两款天线进行了制作和测试,天线的驻波比均位于2以下,新型天线的增益在全频段基本达到10dBi以上,测试仿真结果基本吻合。4,点频(5.8GHz)频率源的设计,根据基于六端口技术射频前端的分析,天线的发射和六端口结的本振输入端需要的是同一个频率的信号源,为此设计了该点频源,确定了点频源采用了PLL技术来实现,锁相芯片为ADI公司的ADF4106,VCO采用了Hittite公司的HMC431LP4,该PLL频率源的实测结果:相位噪声均小于-85dBc/Hz@10kHz,杂散抑制均优于65dBc。实测结果均优于提出的技术指标。
[Abstract]:The use of zero intermediate frequency receiver six port technology in the field of wireless communications has been more and more widely based on the use of six port demodulation technology of the direct demodulation receiver RF signal to baseband signal, a A? D devices do not need to work in the radio frequency band, on the other hand, but also to avoid the use of expensive microwave phase discriminator device and because of these advantages, we carried out the research and design of six port measurement system of RF front-end, and ultra wideband Vivaldi antenna composed of the front of the six port junction, the main parts of the oscillator are designed. The content of the thesis and the innovation mainly includes the following parts: 1, analysis and research of the six port receiver system, a comprehensive analysis of the advantages and disadvantages of various receiver, principle and advantages on the basis of the direct conversion receiver using six port technology, deduced the six end of a common demodulation Type, and finally puts forward six port technology in the use of short distance mobile micro distance measurement principle, and demodulation method for fault location makes the derivation of the.2 theory is the core of the six port junction six port system, this paper designs six port node micro band structure Wilkinson power divider and based on couplers. The simulation of the six port by a Wilkinson power divider and three coupler is composed of structure, working in the 5.6GHz-6.2GHz band, and has carried on the simulation and physical processing, simulation and experimental data with simulation data in the frequency band 1,2 two port transmission loss coefficient is better than that of -7dB, the phase difference of four output ports to maintain stability in the band, the test data of two port transmission loss coefficient is better than that of -7.5dB, the local oscillator and the RF port isolation is better than -20dB.3, the design of ultra wideband Vivaldi antenna, designed two kinds of ultra wideband Vivaldi antenna, The working frequency is 4GHz-11GHz, two different structures are traditional and novel Vivaldi antenna Vivaldi antenna, Vivaldi antenna design based on the traditional, the gain of the antenna in the low-end and high-end frequency decreased respectively by rectangular slot and zero index metamaterial node method. Loading increases the gain of the antenna in the low-end and high end, and the two antennas were produced and tested, the antenna VSWR are located below 2, the new antenna gain in the whole band reached more than 10dBi, the test are basically consistent with the simulation results of.4 frequency (5.8GHz) design of frequency source, according to the analysis of six port technology based on RF front-end antenna. The launch and the six port junction Lo input signal source is in need of the same frequency, so the design of the frequency source, to determine the frequency source using PLL technology to achieve, PLL for ADI, ADF4 106, VCO uses Hittite's HMC431LP4. The measured results of the PLL frequency source are: phase noise is less than -85dBc/Hz@10kHz, spurious suppression is better than 65dBc., and the measured results are better than the proposed technical indicators.

【学位授予单位】：南京航空航天大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN851;TN92
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本文编号：1690551