微波介電常數(shù)測量系統(tǒng)的誤差分析及改進(jìn)方法研究
發(fā)布時間：2018-08-21 13:55
【摘要】：近年來,微波元器件在無線通信技術(shù)、遙感以及航空航天等高科技領(lǐng)域得到了廣泛的應(yīng)用,而材料的介電常數(shù)又在其中起著關(guān)鍵的作用。但隨著溫度和頻率變化,材料的介電常數(shù)通常會發(fā)生變化,最終導(dǎo)致微波元器件的設(shè)計參數(shù)發(fā)生改變。所以對測量得到的介電常數(shù)進(jìn)行誤差分析與改進(jìn)方法研究不僅能有效地評估介電常數(shù)測量結(jié)果,還可提出改善測量結(jié)果的途徑,為微波元器件、電子電路及系統(tǒng)的研制提供保障。本文主要以寬頻段內(nèi)(1~39GHz)微波介電常數(shù)測量系統(tǒng)的誤差分析及改進(jìn)為研究對象。首先對目前材料介電常數(shù)常用的測量方法進(jìn)行了簡要介紹,并重點(diǎn)分析研究了傳輸/反射法與開口同軸探針法測量介電常數(shù)的原理,為介電常數(shù)測量系統(tǒng)的構(gòu)建奠定了理論基礎(chǔ)。針對寬頻段內(nèi)介電常數(shù)的測量,本文確定了采用傳輸/反射法與開口同軸探針法分頻段構(gòu)建介電常數(shù)測量系統(tǒng)的方案,其中傳輸/反射法測量系統(tǒng)又分為同軸與波導(dǎo)傳輸線測量系統(tǒng);另外為了能在傳輸線測量系統(tǒng)中測量粉末材料的介電常數(shù),采用了聚四氟乙烯墊片進(jìn)行固定的方案;在此基礎(chǔ)上本文還分別對所構(gòu)建的測量系統(tǒng)的校準(zhǔn)進(jìn)行了分析;通過對幾種常見材料的介電常數(shù)測量表明了所構(gòu)建的測量系統(tǒng)是可行、有效的。本文還分別根據(jù)測量原理確定了傳輸線測量系統(tǒng)與開口同軸探針測量系統(tǒng)的各種誤差源,并對此進(jìn)行了深入研究。在傳輸線測量系統(tǒng)中,根據(jù)測量原理采用微分法詳細(xì)的推到了誤差計算公式;在開口同軸探針測量系統(tǒng)中,采用數(shù)值法計算最大誤差,從而完成了傳輸線測量系統(tǒng)與開口同軸探針測量系統(tǒng)較為全面的誤差分析。通過對測量誤差的模擬計算,確定了對介電常數(shù)測量結(jié)果影響較大的誤差源;最后分別對影響介電常數(shù)測量結(jié)果的誤差源,提出了降低測量誤差及改善測量結(jié)果的途徑。通過上述的研究,本文很好地完成了寬頻段內(nèi)微波介電常數(shù)測量系統(tǒng)的測量及其誤差分析與改進(jìn)。此外本文采用的計算介電常數(shù)的模型與誤差分析計算程序皆可應(yīng)用于更高頻段的測量系統(tǒng),為進(jìn)一步研究奠定了基礎(chǔ)。
[Abstract]:In recent years, microwave components have been widely used in wireless communication, remote sensing, aerospace and other high-tech fields, and the dielectric constant of materials plays a key role. However, with the change of temperature and frequency, the dielectric constant of the material usually changes, which leads to the change of the design parameters of microwave components. Therefore, the error analysis and improvement method of the dielectric constant obtained from the measurement can not only effectively evaluate the measurement results, but also provide a way to improve the measurement results, that is, microwave components. The development of electronic circuit and system provides guarantee. In this paper, the error analysis and improvement of microwave dielectric constant measurement system in wide band (1~39GHz) are studied. In this paper, the current methods of dielectric constant measurement are briefly introduced, and the principle of transmission / reflection method and open coaxial probe method for dielectric constant measurement is analyzed and studied. It lays a theoretical foundation for the construction of dielectric constant measurement system. Aiming at the measurement of dielectric constant in wide band, the scheme of using transmission / reflection method and open coaxial probe method to construct the dielectric constant measurement system is proposed in this paper. The transmission / reflection measurement system is divided into coaxial and waveguide transmission line measurement system. In addition, in order to measure the dielectric constant of powder material in the transmission line measurement system, PTFE gasket is used to fix the system. On this basis, the calibration of the measurement system is analyzed, and the dielectric constant measurement of several common materials shows that the measurement system is feasible and effective. In this paper, the error sources of transmission line measurement system and open coaxial probe measurement system are determined according to the measuring principle, and the error sources are deeply studied. In the transmission line measurement system, the differential method is used to calculate the error in detail according to the measuring principle, and the numerical method is used to calculate the maximum error in the open coaxial probe measurement system. Thus, the error analysis of transmission line measurement system and open coaxial probe measurement system is completed. Through the simulation calculation of the measurement error, the error source which has a great influence on the measurement results of dielectric constant is determined, and the ways to reduce the measurement error and to improve the measurement result are put forward respectively for the error source that affects the measurement result of dielectric constant. Based on the above research, the measurement of microwave dielectric constant in broadband band and its error analysis and improvement have been completed in this paper. In addition, both the model of calculating dielectric constant and the calculation program of error analysis can be applied to the measurement system in higher frequency band, which lays a foundation for further research.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TM934.33
本文編號：2195945
[Abstract]:In recent years, microwave components have been widely used in wireless communication, remote sensing, aerospace and other high-tech fields, and the dielectric constant of materials plays a key role. However, with the change of temperature and frequency, the dielectric constant of the material usually changes, which leads to the change of the design parameters of microwave components. Therefore, the error analysis and improvement method of the dielectric constant obtained from the measurement can not only effectively evaluate the measurement results, but also provide a way to improve the measurement results, that is, microwave components. The development of electronic circuit and system provides guarantee. In this paper, the error analysis and improvement of microwave dielectric constant measurement system in wide band (1~39GHz) are studied. In this paper, the current methods of dielectric constant measurement are briefly introduced, and the principle of transmission / reflection method and open coaxial probe method for dielectric constant measurement is analyzed and studied. It lays a theoretical foundation for the construction of dielectric constant measurement system. Aiming at the measurement of dielectric constant in wide band, the scheme of using transmission / reflection method and open coaxial probe method to construct the dielectric constant measurement system is proposed in this paper. The transmission / reflection measurement system is divided into coaxial and waveguide transmission line measurement system. In addition, in order to measure the dielectric constant of powder material in the transmission line measurement system, PTFE gasket is used to fix the system. On this basis, the calibration of the measurement system is analyzed, and the dielectric constant measurement of several common materials shows that the measurement system is feasible and effective. In this paper, the error sources of transmission line measurement system and open coaxial probe measurement system are determined according to the measuring principle, and the error sources are deeply studied. In the transmission line measurement system, the differential method is used to calculate the error in detail according to the measuring principle, and the numerical method is used to calculate the maximum error in the open coaxial probe measurement system. Thus, the error analysis of transmission line measurement system and open coaxial probe measurement system is completed. Through the simulation calculation of the measurement error, the error source which has a great influence on the measurement results of dielectric constant is determined, and the ways to reduce the measurement error and to improve the measurement result are put forward respectively for the error source that affects the measurement result of dielectric constant. Based on the above research, the measurement of microwave dielectric constant in broadband band and its error analysis and improvement have been completed in this paper. In addition, both the model of calculating dielectric constant and the calculation program of error analysis can be applied to the measurement system in higher frequency band, which lays a foundation for further research.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TM934.33
【參考文獻(xiàn)】
相關(guān)期刊論文 前1條
1 王政平;任維赫;;材料復(fù)介電常數(shù)測量方法研究進(jìn)展[J];光學(xué)與光電技術(shù);2011年01期
，本文編號：2195945
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