發(fā)布時(shí)間：2018-03-06 06:29

  本文選題：小型化　切入點(diǎn)：諧波抑制　出處：《中國科學(xué)技術(shù)大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：隨著現(xiàn)代通信技術(shù)的快速發(fā)展,設(shè)備的小型化成為一個(gè)重要的發(fā)展趨勢。在射頻前端系統(tǒng)中,諸多的微波無源器件如耦合器、Butler矩陣等的小型化設(shè)計(jì)變得尤其關(guān)鍵。其次,高次諧波會(huì)嚴(yán)重影響系統(tǒng)的質(zhì)量,干擾系統(tǒng)的正常工作。因此,如何在實(shí)現(xiàn)系統(tǒng)小型化的同時(shí),抑制高次諧波也成為了一個(gè)亟待解決的問題。針對(duì)小型化問題,本文提出了一種具有高慢波因子的慢波結(jié)構(gòu),并將其應(yīng)用到分支線耦合器和Butler矩陣的小型化設(shè)計(jì)中;其次,針對(duì)高次諧波問題,通過在慢波結(jié)缺陷地結(jié)構(gòu)來抑制二次諧波,另外,調(diào)節(jié)慢波結(jié)構(gòu)的尺寸參數(shù),使其中的LC諧振器諧振在三次諧波頻率上,從而實(shí)現(xiàn)了具有諧波抑制特性的慢波結(jié)構(gòu),并借助環(huán)形耦合器來驗(yàn)證該慢波結(jié)構(gòu)的設(shè)計(jì)。本文的主要研究內(nèi)容和創(chuàng)新如下:1、介紹了慢波結(jié)構(gòu)的工作原理,并分析了其特性,給出了慢波結(jié)構(gòu)的一些設(shè)計(jì)準(zhǔn)則。同時(shí)分析了由慢波結(jié)構(gòu)S參矩陣反演其特征阻抗和相位的計(jì)算方法。2、以蛇形線結(jié)構(gòu)和交指結(jié)構(gòu)為基礎(chǔ),結(jié)合其等效電路和慢波結(jié)構(gòu)工作原理,利用兩層PCB板的層壓工藝,設(shè)計(jì)和加工了一個(gè)高慢波因子的慢波結(jié)構(gòu),電磁仿真和等效電路計(jì)算與測試結(jié)果基本吻合。利用該慢波結(jié)構(gòu),本文設(shè)計(jì)和制作了小型化的分支線耦合器和4 x 4 Butler矩陣�；诼ńY(jié)構(gòu)的分支線耦合器尺寸為14 x 20 mm2,僅為傳統(tǒng)結(jié)構(gòu)大小的9%;基于慢波結(jié)構(gòu)的4 x 4 Butler矩陣尺寸為76 x 39 mm2,僅為傳統(tǒng)結(jié)構(gòu)的5.8%。同時(shí),分支線耦合器和4 x 4 Butler矩陣均具有良好的帶寬、插損和相位特性。3、在高慢波因子慢波結(jié)構(gòu)的基礎(chǔ)上,在保證慢波結(jié)構(gòu)小尺寸、帶寬和損耗的前提下,通過慢波結(jié)構(gòu)內(nèi)部LC諧振器和螺旋型缺陷地結(jié)構(gòu)引入傳輸零點(diǎn),設(shè)計(jì)了具有二次、三系諧波抑制特性的慢波結(jié)構(gòu)。將此慢波結(jié)構(gòu)應(yīng)用到環(huán)形耦合器,設(shè)計(jì)和加工的環(huán)形耦合器的尺寸為43x7 mm2,僅為傳統(tǒng)結(jié)構(gòu)的6%。同時(shí),二次和三次諧波也被抑制到-25dB以下。4、為了控制成本和降低設(shè)計(jì)復(fù)雜度,設(shè)計(jì)了一個(gè)具有諧波抑制特性的單層慢波結(jié)構(gòu),并基于該單層慢波結(jié)構(gòu)實(shí)現(xiàn)了小型化的環(huán)形耦合器,其尺寸為44.5 x 15.5 mm2,僅為傳統(tǒng)結(jié)構(gòu)的13.89%。測試結(jié)果表明,環(huán)形耦合器具有良好的回波、插損和相位特性,二次和三次諧波也均被抑制到-25dB以下。
[Abstract]:With the rapid development of modern communication technology, the miniaturization of devices becomes an important trend. In RF front-end systems, the miniaturization design of many microwave passive devices such as coupler and Butler matrix becomes particularly critical. High-order harmonics will seriously affect the quality of the system and interfere with the normal operation of the system. Therefore, how to reduce the high-order harmonics while realizing the miniaturization of the system has become a problem to be solved urgently. In this paper, a kind of slow wave structure with high slow wave factor is proposed and applied to the miniaturization design of branch line coupler and Butler matrix. In addition, by adjusting the dimension parameters of the slow wave structure, the LC resonator resonates on the third harmonic frequency, so that the slow wave structure with harmonic suppression characteristics is realized. The main contents and innovations of this paper are as follows: 1. The working principle of the slow wave structure is introduced, and its characteristics are analyzed. Some design criteria of slow wave structure are given. The calculation method of inversion of characteristic impedance and phase from S-parameter matrix of slow wave structure is analyzed. Based on the snake-like structure and intersecting structure, the equivalent circuit and the working principle of slow wave structure are combined. A slow wave structure with high slow-wave factor is designed and fabricated by using the laminating technology of two-layer PCB plate. The calculation results of electromagnetic simulation and equivalent circuit are in good agreement with the test results. In this paper, the miniaturized branch line coupler and 4 x 4 Butler matrix are designed and fabricated. The size of the branch line coupler based on slow wave structure is 14 x 20 mm 2, which is only 9 parts of the traditional structure, and the 4 x 4 Butler matrix ruler based on slow wave structure. An inch of 76 x 39 mm 2, which is only 5.8 of the traditional structure. At the same time, Both the branch line coupler and the 4 x 4 Butler matrix have good bandwidth, insertion loss and phase characteristics. On the basis of the slow wave structure with high slow wave factor, the small size, bandwidth and loss of the slow wave structure are guaranteed. A slow wave structure with the characteristics of second and third harmonic suppression is designed by introducing the LC resonator inside the slow wave structure and the helical defect ground structure at 00:00. The slow wave structure is applied to the ring coupler. The size of the designed and fabricated ring coupler is 43 x 7 mm 2, which is only 6 parts of the traditional structure. At the same time, the second and third harmonics are also suppressed below -25 dB .4. in order to control the cost and reduce the design complexity, A single-layer slow-wave structure with harmonic suppression characteristics is designed. Based on the single-layer slow-wave structure, a miniaturized ring coupler is realized. The size of the coupler is 44.5 x 15.5mm ~ 2, which is only 13.89 of the traditional structure. The ring coupler has good echo, insertion loss and phase characteristics, and the second and third harmonics are also suppressed below -25 dB.
【學(xué)位授予單位】：中國科學(xué)技術(shù)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TN454

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相關(guān)博士學(xué)位論文 前1條

1 沈飛;微帶型慢波結(jié)構(gòu)的研究[D];電子科技大學(xué);2012年

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本文編號(hào)：1573696