【摘要】：隨著移動(dòng)通訊技術(shù)的快速發(fā)展,作為通訊設(shè)備重要一環(huán)的小型天線,對(duì)其要求也越漸增加。對(duì)用于移動(dòng)通訊中的小型天線來(lái)說(shuō),天線效率參數(shù)是其重要參數(shù),它直接關(guān)系到通訊設(shè)備的使用性能,但由于小型天線使用環(huán)境的影響,導(dǎo)致天線效率參數(shù)很難通過(guò)仿真獲得。因此,對(duì)天線效率測(cè)試的研究則是現(xiàn)代小型天線設(shè)計(jì)的重要部分。本文中,首先對(duì)小型天線效率測(cè)試的研究背景以及測(cè)試方法進(jìn)行分析,對(duì)比惠勒法、方向圖綜合法以及混響室測(cè)試法三種方法后,選擇采用混響室法對(duì)天線效率進(jìn)行測(cè)試。根據(jù)對(duì)混響室結(jié)構(gòu)以及性能的研究分析,本文中仿真設(shè)計(jì)了一個(gè)可以應(yīng)用于1-5GHz頻段內(nèi)測(cè)試的混響室測(cè)試平臺(tái)。并且,為保證該混響室測(cè)試平臺(tái)的可用性,文中設(shè)計(jì)介紹了可以用于檢驗(yàn)測(cè)試的對(duì)數(shù)周期天線以及單錐天線,并編寫相關(guān)測(cè)試軟件對(duì)其空腔場(chǎng)均勻性校準(zhǔn)以及屏蔽效能測(cè)試進(jìn)行控制。在混響室測(cè)試平臺(tái)設(shè)計(jì)搭建完成后,對(duì)混響室測(cè)天線效率的原理與方法進(jìn)行研究分析,詳細(xì)列出了天線效率測(cè)試的相關(guān)步驟,并對(duì)測(cè)試方法進(jìn)行了一定的改進(jìn)。為驗(yàn)證利用混響室測(cè)天線效率方法的準(zhǔn)確性,對(duì)對(duì)數(shù)周期天線以及已知效率的MIMO天線的天線效率進(jìn)行測(cè)試,將混響室測(cè)試結(jié)果與在暗室中測(cè)得的結(jié)果進(jìn)行比較,并對(duì)測(cè)試結(jié)果進(jìn)行分析。本文主要做了以下幾個(gè)改進(jìn)創(chuàng)新點(diǎn):第一,在混響室測(cè)試平臺(tái)的搭建過(guò)程中,由于其最低使用頻率高、所設(shè)計(jì)的結(jié)構(gòu)體積較小,因此為了方便后期移動(dòng)及改裝,利用鋁型材構(gòu)建活動(dòng)框架,將其設(shè)計(jì)為一個(gè)可移動(dòng)拆卸的測(cè)試平臺(tái);第二,在對(duì)混響室測(cè)試平臺(tái)進(jìn)行空腔場(chǎng)均勻性校準(zhǔn)時(shí),通過(guò)對(duì)場(chǎng)均勻性校準(zhǔn)原理的分析研究,利用電小振子代替場(chǎng)強(qiáng)探頭進(jìn)行測(cè)試,以便降低測(cè)試經(jīng)費(fèi)要求;第三,在對(duì)天線效率進(jìn)行測(cè)量的過(guò)程中,根據(jù)對(duì)其測(cè)試方法的研究,采用連續(xù)攪拌法對(duì)天線的單頻點(diǎn)效率進(jìn)行了測(cè)試,并分析其測(cè)試結(jié)果。
[Abstract]:With the rapid development of mobile communication technology, the requirement of small antenna, which is an important part of communication equipment, is increasing. For the small antenna used in mobile communication, the antenna efficiency parameter is an important parameter, which is directly related to the performance of the communication equipment. However, because of the influence of the environment of the small antenna, it is difficult to obtain the antenna efficiency parameter by simulation. Therefore, the research of antenna efficiency test is an important part of modern small antenna design. In this paper, firstly, the research background and testing methods of small antenna efficiency test are analyzed. After comparing Wheeler method, pattern synthesis method and reverberation chamber test method, the antenna efficiency is tested by reverberation chamber method. Based on the research and analysis of the structure and performance of reverberation chamber, a test platform for reverberation chamber is designed and simulated in this paper, which can be used for testing in 1-5GHz frequency band. In order to ensure the availability of the test platform of the reverberation chamber, the logarithmic periodic antenna and the single cone antenna which can be used to test the reverberation chamber are designed and introduced in this paper. The calibration of cavity field uniformity and the test of shielding effectiveness are controlled by the relevant test software. After the design and construction of the reverberation chamber test platform, the principle and method of antenna efficiency measurement in reverberation chamber are studied and analyzed, the relevant steps of antenna efficiency testing are listed in detail, and the test method is improved to some extent. In order to verify the accuracy of using reverberation chamber to measure antenna efficiency, the antenna efficiency of logarithmic periodic antenna and known efficiency MIMO antenna is tested. The results of reverberation chamber test are compared with those obtained in dark chamber. The test results are analyzed. This paper mainly makes the following improvements and innovations: first, in the process of building the test platform of reverberation chamber, because of its high minimum use frequency, the designed structure volume is smaller, so in order to facilitate the later period movement and refit, It is designed as a movable and detachable test platform using aluminum profile. Secondly, the principle of field uniformity calibration is analyzed and studied when the cavity field uniformity is calibrated to the test platform of reverberation chamber. In order to reduce the cost of the test, the electric small vibrator is used instead of the field intensity probe to test. Thirdly, in the process of measuring the antenna efficiency, according to the research of its testing method, The single frequency efficiency of antenna is measured by continuous mixing method, and the test results are analyzed.
【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】：2017
【分類號(hào)】：TN820

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本文編號(hào)：2217238