發(fā)布時間：2018-08-10 22:16

【摘要】：隨著通信領(lǐng)域的快速發(fā)展,尤其是無線通信和互聯(lián)網(wǎng)通信的興起,信號的頻率資源變得日益緊張,同時隨著移動互聯(lián)終端的廣泛普及,向微波射頻電路和集成電路等電子器件提出了小型化、高性能、高可靠性等要求。而濾波器作為通信系統(tǒng)中控制信號傳輸?shù)年P(guān)鍵器件,對整個通信系統(tǒng)起著決定性的作用。因此濾波器的高性能和小型化的研究已經(jīng)成為當(dāng)下備受關(guān)注的熱點問題。多級濾波器通過增加諧振級個數(shù),有效地加強了各級之間的耦合效應(yīng)以增強帶外衰減、降低過渡帶矩形系數(shù),提高邊帶陡峭,從而優(yōu)化濾波器的性能。同時結(jié)合具有低成本、微型化、耐高溫等優(yōu)點的低溫共燒陶瓷(LTCC:Low Temperature Co-fired Ceramic)技術(shù),實現(xiàn)小型化的生產(chǎn)目標(biāo)。本文圍繞基于LTCC技術(shù)的多級微波濾波器的研究與設(shè)計這個課題,探究微型化設(shè)計方案,針對不同頻段、不同結(jié)構(gòu)、不同應(yīng)用領(lǐng)域的濾波器的特點,完成了以下工作:(1)完成了一款六級低通濾波器的研究與設(shè)計,其截止頻率3.2GHz,采用集總結(jié)構(gòu)實現(xiàn)。充分利用了 LTCC內(nèi)埋技術(shù),在原型電路基礎(chǔ)上加入傳輸零點以加快帶外衰減,同時在級聯(lián)理論基礎(chǔ)上對三級結(jié)構(gòu)進行級聯(lián)優(yōu)化,獲得了較好的測試結(jié)果。(2)完成了兩款基于帶狀線結(jié)構(gòu)的多級帶通濾波器的設(shè)計與相關(guān)研究,分別為中心頻率3.45GHz的八級帶通濾波器及中心頻率2.8GHz的十二級帶通濾波器。首先調(diào)節(jié)單級諧振單元確定工作頻率,再根據(jù)諧振級之間的耦合效應(yīng)不斷增加級數(shù),同時引入Z字型結(jié)構(gòu)引入傳輸零點,設(shè)計過程有效驗證了多級結(jié)構(gòu)對于濾波器帶外性能的優(yōu)化,以及隨著級數(shù)增加而帶來的影響。(3)設(shè)計并分析了一款多模形式的多級帶通濾波器,中心頻率7GHz,相對帶寬85.7%。根據(jù)多模原理選擇合適的諧振結(jié)構(gòu),并且利用加載電容增強級間耦合,同時加入了缺陷地結(jié)構(gòu)改善高頻寄生通帶,并且研究了設(shè)計中的相關(guān)影響因素。本文研究設(shè)計的四款濾波器充分利用了 LTCC技術(shù)的特點,綜合考慮性能和尺寸的設(shè)計要求,最終獲得了優(yōu)異的濾波性能,集成度高。其中兩款已完成實際生產(chǎn)與測試,性能與理論設(shè)計契合度較高,已經(jīng)進行批量生產(chǎn),成品率80%以上,應(yīng)用廣泛。
[Abstract]:With the rapid development of communication field, especially the rise of wireless communication and Internet communication, the frequency resources of signals become increasingly tight, and with the widespread popularity of mobile interconnected terminals, Miniaturization, high performance and high reliability are required for microwave RF circuits and integrated circuits. As the key device to control signal transmission in communication system, filter plays a decisive role in the whole communication system. Therefore, the research of high performance and miniaturization of filters has become a hot issue. By increasing the number of resonant stages, the multistage filter effectively strengthens the coupling effect between different levels to enhance the out-of-band attenuation, reduce the rectangular coefficient of the transition band, and improve the steepness of the sideband, so as to optimize the performance of the filter. At the same time, the low temperature co-fired ceramics (LTCC:Low Temperature Co-fired Ceramic) technology which has the advantages of low cost, miniaturization and high temperature resistance is combined to realize the production goal of miniaturization. This paper focuses on the research and design of multistage microwave filters based on LTCC technology, and explores the miniaturization design scheme, aiming at the characteristics of filters with different frequency bands, different structures and different application fields. The main works are as follows: (1) A six-stage low-pass filter is studied and designed. The cutoff frequency is 3.2GHz, and the lumped structure is adopted. Taking full advantage of the LTCC embedded technology, the transmission zero is added to the prototype circuit to accelerate the out-of-band attenuation, and the cascade optimization of the three-level structure is carried out on the basis of the cascade theory. Good results are obtained. (2) two multistage bandpass filters based on banded line structure are designed and studied. They are 8-stage bandpass filters with center frequency 3.45GHz and 12-stage bandpass filters with central frequency 2.8GHz. First, the single-stage resonant unit is adjusted to determine the working frequency, then the series is increased according to the coupling effect between the resonant stages, and the transmission zeros are introduced into the Z-shaped structure at the same time. The design process effectively verifies the multi-level structure's optimization of the out-of-band performance of the filter and its influence with the increase of the series. (3) A multi-mode multistage band-pass filter with a center frequency of 7 GHz and a relative bandwidth of 85.7 GHz is designed and analyzed. According to the multi-mode principle, the appropriate resonant structure is selected, and the interstage coupling is enhanced by using the loaded capacitance, and the high frequency parasitic passband is improved by adding the defective ground structure, and the relevant influencing factors in the design are studied. The four filters studied and designed in this paper make full use of the characteristics of LTCC technology and take into account the design requirements of performance and size. Finally, excellent filtering performance and high integration are obtained. Two of them have been produced and tested in practice, with high agreement between performance and theoretical design. They have been produced in batches with a yield of more than 80% and have been widely used.
【學(xué)位授予單位】：南京理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TN713

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