發(fā)布時(shí)間：2019-04-24 17:53

【摘要】：隨著集成電路技術(shù)的發(fā)展,對(duì)于無(wú)線通信系統(tǒng),有源電路的部分已經(jīng)實(shí)現(xiàn)了小型化甚至微型化,因此整個(gè)無(wú)線通信系統(tǒng)也轉(zhuǎn)而開(kāi)始要求小型化、高性能化的無(wú)源電路。這其中,具有濾波特性的微帶天線不但可以滿足當(dāng)前各種技術(shù)發(fā)展的需求,而且也會(huì)是未來(lái)發(fā)展的一大趨勢(shì)。作為無(wú)源電路的重要組成部分,天線和濾波器都是不可缺少的。將這兩者集成化,就構(gòu)成了濾波天線。微帶濾波天線是指對(duì)于指定的一些頻段具有濾波功能的微帶天線。由于微帶濾波天線兼具了天線和濾波器的功能,所以這種微帶天線不僅解決了傳統(tǒng)的電子設(shè)備中天線和濾波器之間級(jí)聯(lián)存在的失配問(wèn)題,而且還減小了器件之間不必要的能量損失,另外,由于微帶濾波天線針對(duì)天線和濾波器進(jìn)行了協(xié)同設(shè)計(jì),整體的體積上也會(huì)有所減小,性能也有所提高。本文一開(kāi)始,通過(guò)分析和研究傳統(tǒng)的設(shè)計(jì)理念和方法,針對(duì)濾波器和天線,作為兩個(gè)獨(dú)立的組件,分別闡述了微帶帶通濾波器的設(shè)計(jì)方法以及微帶天線的設(shè)計(jì)方法,分析了傳統(tǒng)設(shè)計(jì)方法中存在的不足之處。同時(shí)搜集了近些年來(lái)國(guó)內(nèi)外對(duì)天線和濾波器進(jìn)行綜合設(shè)計(jì)的研究情況。在這些基礎(chǔ)上,提出了一種從設(shè)計(jì)端就有所創(chuàng)新的微帶濾波天線的設(shè)計(jì)理念。該濾波天線是由平行耦合線帶通濾波器和倒L型天線構(gòu)成的,其中倒L型天線作為天線之外,還充當(dāng)了三階平行耦合線帶通濾波器的末級(jí)諧振器,從而構(gòu)成一個(gè)帶三階諧振的濾波天線。采用HFSS仿真軟件,仿真出中心頻率在5GHz,在相對(duì)帶寬為7.2%的通帶內(nèi)增益大于3dB,且增益波動(dòng)小于0.5dB,在通帶內(nèi)S11均小于10dB的指標(biāo)。經(jīng)過(guò)加工和測(cè)試,比較測(cè)試結(jié)果與仿真結(jié)果,兩者吻合良好,印證了此種設(shè)計(jì)方法的正確性和可行性。作為后期的改進(jìn),通過(guò)改變平行耦合線帶通濾波器的饋電方式,采用偽交指耦合的結(jié)構(gòu)來(lái)實(shí)現(xiàn)強(qiáng)耦合,使得線間距得以增大,更加易于加工。最后,對(duì)本次研究工作進(jìn)行總結(jié),并探討了濾波天線做進(jìn)一步優(yōu)化的可能性和研究的方向。
[Abstract]:With the development of integrated circuit technology, the active circuit has been miniaturized or even miniaturized for wireless communication systems. Therefore, the whole wireless communication system has started to require miniaturization and high performance passive circuits. Among them, the microstrip antenna with filter characteristics can not only meet the needs of the development of various technologies, but also will be a major trend in the future. As an important part of passive circuit, antenna and filter are indispensable. When the two are integrated, the filter antenna is formed. Microstrip filter antenna is a microstrip antenna which has filtering function for certain frequency bands. Because the microstrip filter antenna has the function of both antenna and filter, the microstrip antenna not only solves the mismatch problem between the antenna and the filter in the traditional electronic equipment. Moreover, the unnecessary energy loss between devices is reduced. In addition, due to the cooperative design of microstrip filter antenna for antenna and filter, the overall size of the antenna will also be reduced and the performance of the microstrip filter antenna will be improved. At the beginning of this paper, by analyzing and studying the traditional design ideas and methods, the design method of microstrip bandpass filter and microstrip antenna are described respectively, aiming at the filter and antenna as two independent components. The shortcomings of traditional design methods are analyzed. At the same time, the comprehensive design of antenna and filter at home and abroad in recent years is collected. On the basis of these, a new design idea of microstrip filter antenna is put forward, which has been innovated from the design end. The filter antenna is composed of a parallel coupling line band-pass filter and an inverted L-type antenna, in which the inverted L-type antenna serves as the last stage resonator of the third-order parallel coupling line band-pass filter, in addition to the inverted L-type antenna as the antenna. Thus a filter antenna with third-order resonance is constructed. Using HFSS simulation software, the central frequency is 5 GHz, the gain is greater than 3 dB in the pass band with relative bandwidth 7.2%, and the gain fluctuation is less than 0.5 dB, and the S11 is less than the index of 10dB in the pass band. After processing and testing, the comparison of test results and simulation results shows that the two methods are in good agreement with each other, and the correctness and feasibility of the design method are verified. As a later improvement, the structure of pseudo-cross-finger coupling is adopted to realize strong coupling by changing the feed mode of parallel coupling linear band-pass filter, which makes the line spacing larger and easier to process. Finally, the research work is summarized, and the possibility of further optimization of the filter antenna and the research direction are discussed.
【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)】：TN827

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