發(fā)布時(shí)間：2018-02-20 19:10

  本文關(guān)鍵詞： RFID系統(tǒng) 近場(chǎng)天線 微帶天線 諧振腔模型法 優(yōu)化設(shè)計(jì)方法　出處：《電子科技大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：RFID(Radio Frequency Identification,射頻識(shí)別)系統(tǒng)在交通、物流貨運(yùn)、工業(yè)生產(chǎn)、設(shè)備監(jiān)控以及服務(wù)行業(yè)等諸多領(lǐng)域中已經(jīng)得到了廣泛的應(yīng)用。RFID系統(tǒng)主要由標(biāo)簽(Tag)、應(yīng)用系統(tǒng)(Application System)和讀寫器(Reader)三個(gè)部分組成。依據(jù)RFID系統(tǒng)中的標(biāo)簽在讀寫器天線的哪個(gè)輻射場(chǎng)區(qū)被激活,將RFID系統(tǒng)分為近場(chǎng)RFID系統(tǒng)和遠(yuǎn)場(chǎng)RFID系統(tǒng)。超高頻近場(chǎng)RFID系統(tǒng)由于其具有ILT(Item Level Tagging,物品級(jí)標(biāo)簽識(shí)別)和更高的數(shù)據(jù)通信速率與存儲(chǔ)量的特點(diǎn)受到了越來越多的關(guān)注,隨之應(yīng)用于的超高頻近場(chǎng)RFID系統(tǒng)的讀寫器近場(chǎng)天線的設(shè)計(jì)方法研究也受到了越來越多的重視。由于天線輻射近場(chǎng)區(qū)的場(chǎng)分布沒有形成規(guī)律的方向圖,近場(chǎng)天線沒有一個(gè)行之有效的設(shè)計(jì)理論支撐。因此,對(duì)超高頻RFID近場(chǎng)天線的設(shè)計(jì)方法和測(cè)試方法的研究已經(jīng)成為了一個(gè)十分重要的研究課題。本文對(duì)近場(chǎng)天線的應(yīng)用及設(shè)計(jì)方法進(jìn)行深入研究,結(jié)合天線近場(chǎng)耦合原理和微帶天線諧振腔模型法,提出了一種近場(chǎng)天線的優(yōu)化設(shè)計(jì)方法,還將天線應(yīng)用到電信機(jī)柜管理系統(tǒng)中,利用HFSS對(duì)設(shè)計(jì)出的天線進(jìn)行仿真,并加以測(cè)試驗(yàn)證。本文的主要工作體現(xiàn)在以下的四個(gè)方面:(1)依據(jù)微帶天線諧振腔模型法,提出了以微帶天線TM模在自由空間中輻射近場(chǎng)區(qū)的場(chǎng)強(qiáng)分布為參數(shù)的目標(biāo)函數(shù),優(yōu)化出天線的幾何參數(shù);(2)利用HFSS對(duì)優(yōu)化出的天線的幾何形狀進(jìn)行建模仿真,得出天線在自由空間中以及在電信機(jī)柜環(huán)境下的回波損耗和輻射近場(chǎng)區(qū)的場(chǎng)強(qiáng)分布的仿真結(jié)果;(3)建立針對(duì)電信機(jī)柜環(huán)境下的近場(chǎng)天線的輻射近場(chǎng)區(qū)的場(chǎng)強(qiáng)分布的測(cè)量系統(tǒng),并測(cè)試單根近場(chǎng)天線的輻射近場(chǎng)區(qū)的場(chǎng)強(qiáng)分布;(4)提出了對(duì)于覆蓋整個(gè)電信機(jī)柜管理平面的天線系統(tǒng)的設(shè)計(jì)方案,利用時(shí)分系統(tǒng)連接8根近場(chǎng)天線與RFID系統(tǒng)讀寫器。制作出的天線經(jīng)過測(cè)試,在電信機(jī)柜環(huán)境下的回波損耗在頻帶918MHz~926MHz中小于-10dB,并且諧振于922MHz。并且單根近場(chǎng)天線的近場(chǎng)場(chǎng)強(qiáng)能夠覆蓋電信機(jī)柜管理平面內(nèi)的500mm×300mm的區(qū)域,并據(jù)此確定出覆蓋整個(gè)電信機(jī)柜平面的天線系統(tǒng)的設(shè)計(jì)方案。最后本文對(duì)全文作了總結(jié),并對(duì)今后仍可以深入研究的內(nèi)容作了展望。
[Abstract]:RFID(Radio Frequency Identification (RFID) systems in transportation, logistics, freight, industrial production, RFID system has been widely used in many fields, such as equipment monitoring and service industry. RFID system is mainly composed of tag tag, application system and reader. According to the tag in RFID system, which is in the reader antenna? Three radiation fields have been activated, The RFID system is divided into near-field RFID system and far-field RFID system. UHF near-field RFID system has attracted more and more attention because of its characteristics of ILT(Item Level tagging (object-level label recognition) and higher data communication rate and storage capacity. More and more attention has been paid to the design method of reader near field antenna in UHF near field RFID system. Because the field distribution of antenna radiation near field does not form a regular pattern, The near-field antenna is not supported by an effective design theory. The research on the design and test methods of UHF RFID near-field antenna has become a very important research topic. In this paper, the application and design method of near-field antenna are deeply studied. Combined with the principle of near-field coupling of antenna and the resonator model method of microstrip antenna, an optimal design method of near-field antenna is proposed. The antenna is also applied to the management system of telecommunication cabinet, and the designed antenna is simulated by HFSS. The main work of this paper is as follows: 1) according to the resonant cavity model method of microstrip antenna, the objective function is proposed, which takes the field intensity distribution of TM mode of microstrip antenna in the radiation near field region in free space as the parameter. The geometric parameters of the optimized antenna are simulated by HFSS, and the geometric shape of the optimized antenna is modeled and simulated. The simulation results of echo loss and field intensity distribution in the near field region of antenna in the free space and in the environment of telecommunication cabinet are obtained. The measurement system for the field intensity distribution in the near field area of the near field antenna in the environment of telecommunication cabinet is established. The field intensity distribution in the radiation near-field region of a single near-field antenna is tested. A design scheme for the antenna system covering the whole management plane of the telecommunication cabinet is proposed. Using the time division system to connect 8 near-field antennas to the RFID system reader. The echo loss in the environment of telecommunication cabinet is less than -10 dB in the frequency band 918 MHz ~ 926 MHz, and the resonance is 922 MHz. The near-field intensity of a single near-field antenna can cover the 500mm 脳 300mm area in the management plane of the telecommunication cabinet. Based on this, the design scheme of antenna system covering the whole plane of telecommunication cabinet is determined. Finally, this paper summarizes the full text and looks forward to the contents that can be further studied in the future.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TN822;TP391.44

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相關(guān)碩士學(xué)位論文 前1條

1 賈朝鋒;強(qiáng)金屬環(huán)境中應(yīng)用RFID近場(chǎng)天線的設(shè)計(jì)與研究[D];電子科技大學(xué);2012年

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本文編號(hào)：1519793