發(fā)布時間：2018-05-18 10:57

  本文選題：RFID + 閱讀器天線��； 參考：《南京航空航天大學(xué)》2014年碩士論文

【摘要】：射頻識別(RFID, Radio Frequency Identification)技術(shù)是一種利用射頻電磁波獲得目標對象數(shù)據(jù)的非接觸式通信技術(shù)。目前業(yè)界最關(guān)注UHF(840-960MHz)頻段的RFID技術(shù)，也在逐步探索2.45GHz和5.8GHz的RFID產(chǎn)品。而閱讀器天線是RFID系統(tǒng)中傳遞無線電波的部件，對它的研究與設(shè)計具有重要意義。 首先，本文總結(jié)了RFID閱讀器天線的相關(guān)知識，并針對標簽天線擺放位置確定的情況，提出了一款小型化的PIFA型RFID閱讀器天線，該天線結(jié)構(gòu)簡單，工作頻段為835-851MHz,覆蓋了我國用于RFID自主研發(fā)的840-845MHz頻段，，增益峰值為1.6dBi。 其次，本文對微帶天線圓極化實現(xiàn)方法進行了研究，結(jié)合傳統(tǒng)的微帶天線設(shè)計步驟，設(shè)計了一款基于DGS結(jié)構(gòu)的圓極化微帶貼片天線，采用1.6mm厚的FR4基片。仿真結(jié)果顯示，該天線阻抗帶寬在42MHz左右，圓極化軸比帶寬在10MHz左右，在925MHz增益峰值達到0.8dBi，與不加入缺陷地結(jié)構(gòu)的天線相比，該款天線增益提高了3dBi左右。為了進一步提高增益，采用加厚介質(zhì)基板的方法，最終設(shè)計出一款阻抗帶寬94MHz，軸比帶寬21.3MHz，在920-925MHz的平均峰值增益均大于3.2dBi的圓極化RFID閱讀器天線，且該天線結(jié)構(gòu)簡單，造價低，很適用于UHF頻段的RFID閱讀器的設(shè)計。 最后，本文分析了微帶天線多頻實現(xiàn)的常用方法，并針對閱讀器天線需要多頻段的要求，利用縫隙加載的方法設(shè)計了一款可工作于920-925MHz和2.4-2.45GHz的雙頻圓極化RFID閱讀器微帶天線，仿真結(jié)果表明，天線在微波頻段的兩段阻抗帶寬分別是905-954MHz和2.424-2.470GHz，3dB軸比帶寬分別是916.6-928.2MHz和2.420-2.451GHz，并在軸比帶寬內(nèi)的平均增益分別是1.6dBi和3.5dBi，適用于雙頻圓極化RFID閱讀器的設(shè)計。
[Abstract]:Radio Frequency Identification (RFID) and Radio Frequency Identification) (Radio Frequency Identification) technology is a contactless communication technology which can obtain object data by radio frequency electromagnetic wave. At present, the industry pays most attention to the RFID technology in UHF 840-960MHz band, and is exploring the RFID products of 2.45GHz and 5.8GHz step by step. Reader antenna is the part of transmitting radio wave in RFID system, so it is of great significance to research and design it. Firstly, this paper summarizes the relevant knowledge of RFID reader antenna, and proposes a miniaturized PIFA RFID reader antenna, which has a simple structure. The working frequency range is 835-851 MHz, which covers the 840-845MHz band of RFID developed independently in China. The gain peak value is 1.6 d Bi. Secondly, the realization method of circular polarization of microstrip antenna is studied in this paper. A circular polarization microstrip patch antenna based on DGS structure is designed by combining the traditional design steps of microstrip antenna. The 1.6mm thick FR4 substrate is adopted. The simulation results show that the impedance bandwidth of the antenna is about 42MHz, the ratio bandwidth of circular polarization axis is about 10MHz, and the peak gain of 925MHz is 0.8dBi. compared with the antenna without defective ground structure, the gain of this antenna is increased by about 3dBi. In order to further improve the gain, the method of thickening dielectric substrate is used to design an impedance bandwidth of 94 MHz, and the axial ratio bandwidth of 21.3 MHz. The average peak gain in 920-925MHz is higher than that in 3.2dBi, and the structure of the antenna is simple and the cost is low. Very suitable for UHF band RFID reader design. Finally, this paper analyzes the common methods of multi-frequency realization of microstrip antenna, and designs a dual-frequency circularly polarized RFID reader microstrip antenna which can work in 920-925MHz and 2.4-2.45GHz. The simulation results show that the two-band impedance bandwidth of the antenna in microwave band is 905-954MHz and 2.424-2.470GHz / 3 dB axial ratio bandwidth is 916.6-928.2MHz and 2.420-2.451GHz respectively, and the average gain in the axial ratio bandwidth is 1.6dBi and 3.5dBi. it is suitable for the design of dual-frequency circularly polarized RFID reader.
【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】：TP391.44;TN822

【參考文獻】

相關(guān)期刊論文 前1條

1 王騫;席曉莉;;小型雙頻圓極化微帶天線[J];現(xiàn)代電子技術(shù);2008年05期

本文編號：1905571