本文選題：六端口技術(shù)　切入點：射頻前端　出處：《南京航空航天大學(xué)》2014年碩士論文

【摘要】：基于六端口技術(shù)的零中頻接收機在無線通信領(lǐng)域中得到越來越廣泛的運用,利用六端口解調(diào)技術(shù)將射頻接收信號直接解調(diào)到基帶信號,一方面A?D器件不需要工作在射頻的頻段,另一方面也避免了使用鑒相器等昂貴的微波器件,由于這些優(yōu)點,我們對六端口測距系統(tǒng)射頻前端進(jìn)行了研究和設(shè)計,并對構(gòu)成前端的超寬帶Vivaldi天線,六端口結(jié),本振源等主要部件進(jìn)行了設(shè)計。本論文的工作內(nèi)容及創(chuàng)新點主要包括以下幾個部分:1,六端口接收機系統(tǒng)的分析與研究,綜合分析了各種接收機的優(yōu)劣點,在此基礎(chǔ)上闡述了直接變頻接收機采用六端口技術(shù)的原理與優(yōu)勢,推導(dǎo)了六端口技術(shù)的解調(diào)公式,并在最后提出了六端口技術(shù)在短距離微小移動距離測量的運用,對測距的原理和解調(diào)方法作出理論的推導(dǎo)。2,六端口系統(tǒng)中最為核心的六端口結(jié),本文設(shè)計了基于Wilkinson功分器和耦合器的微帶結(jié)構(gòu)的六端口結(jié),仿真了由一個Wilkinson功分器和三個耦合器組成的六端口結(jié)結(jié)構(gòu),工作頻帶在5.6GHz-6.2GHz,并對其進(jìn)行了仿真和實物加工,仿真和實測數(shù)據(jù)吻合,在整個頻段內(nèi)仿真數(shù)據(jù)1,2兩端口的傳輸損耗系數(shù)優(yōu)于-7dB,四個輸出端口的相位差在頻段內(nèi)保持穩(wěn)定,測試數(shù)據(jù)中兩端口傳輸損耗系數(shù)優(yōu)于-7.5dB,本振與射頻端口隔離度優(yōu)于-20dB。3,超寬帶Vivaldi天線的設(shè)計,設(shè)計了兩款超寬帶Vivaldi天線,工作頻率是4GHz-11GHz,兩種結(jié)構(gòu)分別為傳統(tǒng)的Vivaldi天線和新型的Vivaldi天線,在傳統(tǒng)的Vivaldi天線設(shè)計基礎(chǔ)上,針對天線在低端和高端頻率處的增益下降,分別采用了矩形縫隙和零折射率超材料結(jié)構(gòu)加載的方法提高了天線在低端和高端的增益,并對兩款天線進(jìn)行了制作和測試,天線的駐波比均位于2以下,新型天線的增益在全頻段基本達(dá)到10dBi以上,測試仿真結(jié)果基本吻合。4,點頻(5.8GHz)頻率源的設(shè)計,根據(jù)基于六端口技術(shù)射頻前端的分析,天線的發(fā)射和六端口結(jié)的本振輸入端需要的是同一個頻率的信號源,為此設(shè)計了該點頻源,確定了點頻源采用了PLL技術(shù)來實現(xiàn),鎖相芯片為ADI公司的ADF4106,VCO采用了Hittite公司的HMC431LP4,該PLL頻率源的實測結(jié)果:相位噪聲均小于-85dBc/Hz@10kHz,雜散抑制均優(yōu)于65dBc。實測結(jié)果均優(yōu)于提出的技術(shù)指標(biāo)。
[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.

【學(xué)位授予單位】：南京航空航天大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TN851;TN92
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本文編號：1690551