發(fā)布時(shí)間：2018-06-22 12:52

  本文選題：平面微帶濾波器 + 傳輸零點(diǎn)�。� 參考：《南京理工大學(xué)》2017年碩士論文

【摘要】：微波濾波器是現(xiàn)代無(wú)線通信和雷達(dá)等系統(tǒng)的射頻前端的重要器件。隨著現(xiàn)代技術(shù)的快速發(fā)展,電子產(chǎn)品集成度越來(lái)越高,也就意味著對(duì)濾波器平面化和小型化的要求更高。同時(shí),頻譜資源日趨緊張的現(xiàn)狀對(duì)濾波器的通帶頻率選擇性和帶外抑制度也提出了更高的要求。多頻濾波器能夠同時(shí)兼容多種通信資源,平衡濾波器能夠有效地抑制共模干擾,因此被廣泛地應(yīng)用于通信或雷達(dá)領(lǐng)域。本論文主要從增加濾波器傳輸零點(diǎn)的角度出發(fā),結(jié)合不同的諧振器,設(shè)計(jì)實(shí)現(xiàn)了多種高選擇性和高帶外諧波抑制度的微波濾波器。主要研究工作包括:1.高選擇性帶通濾波器及雙工器的設(shè)計(jì):結(jié)合開(kāi)路/短路形式的雙重行為諧振器(DBR),設(shè)計(jì)了兩種高頻率選擇性的帶通濾波器,在上阻帶分別實(shí)現(xiàn)了 3個(gè)和6個(gè)傳輸零點(diǎn),設(shè)計(jì)結(jié)構(gòu)緊湊;另外,在不影響帶內(nèi)傳輸特性的情況下,可以通過(guò)調(diào)節(jié)開(kāi)路/短路支節(jié)線電長(zhǎng)度,改變傳輸零點(diǎn)在通帶兩側(cè)的位置,提高了上阻帶抑制度。進(jìn)一步地,在DBR濾波器的基礎(chǔ)上,利用T型結(jié)設(shè)計(jì)了一個(gè)高隔離度的雙工器。2.高選擇性雙頻帶通/帶阻濾波器的設(shè)計(jì):提出了不等長(zhǎng)λ/4階躍阻抗諧振器(SIR)的諧振特性理論,利用兩個(gè)對(duì)稱的λ/4 SIR設(shè)計(jì)實(shí)現(xiàn)了兩種雙頻帶通濾波器,通過(guò)兩個(gè)諧振器之間的耦合產(chǎn)生可控傳輸零點(diǎn)。提出了基于開(kāi)路/短路耦合線的雙頻帶阻濾波器,通過(guò)奇偶模分析方法詳細(xì)分析了多個(gè)帶外傳輸極點(diǎn)的產(chǎn)生原因,并在此基礎(chǔ)上加載變?nèi)莨?設(shè)計(jì)了上阻帶固定不變、下阻帶中心頻率可調(diào)節(jié)的雙頻帶阻濾波器。3.高選擇性寬帶平衡濾波器的設(shè)計(jì):結(jié)合開(kāi)路/短路耦合線特性,提出了兩個(gè)分別具有4個(gè)和6個(gè)傳輸零點(diǎn)的高選擇性平衡濾波器,在三倍頻內(nèi)都實(shí)現(xiàn)了較高的共模抑制;差模響應(yīng)的通帶特性和共模響應(yīng)的抑制特性主要由加載支節(jié)的開(kāi)路耦合線產(chǎn)生,傳輸零點(diǎn)主要由兩路信號(hào)能量相消和加載的支節(jié)產(chǎn)生。
[Abstract]:Microwave filter is an important part of RF front end in modern wireless communication and radar systems. With the rapid development of modern technology, the integration of electronic products is becoming more and more high, which means that the flatness and miniaturization of filters are higher. At the same time, the increasing shortage of spectrum resources puts forward higher requirements for passband frequency selectivity and out-of-band suppression of filters. Multi-frequency filters can be compatible with multiple communication resources at the same time, and balanced filters can effectively suppress common-mode interference, so they are widely used in the field of communication or radar. In this paper, we design and implement a variety of microwave filters with high selectivity and high suppression of out-of-band harmonics from the point of view of increasing the transmission zeros of filters and combining with different resonators. The main research work includes: 1. Design of highly selective bandpass filter and Duplexer: two kinds of high frequency selective bandpass filters are designed in combination with open circuit / short circuit dual behavior resonators (DBR). Three transmission zeros and six transmission zeros are realized in the upstopband, respectively. The design structure is compact and the position of transmission zero on both sides of the passband can be changed by adjusting the electric length of the open / short circuit branch without affecting the in-band transmission characteristics and the suppression degree of the upper stopband can be improved. Furthermore, on the basis of DBR filter, a high isolation Duplexer. 2 is designed by using T junction. Design of highly selective Dual-band Bandpass / Bandstop filters: the resonant characteristic theory of 位 / 4-step impedance resonator (Sir) with unequal length is proposed. Two kinds of dual-band band-pass filters are realized by using two symmetrical 位 / 4SIR designs. A controllable transmission zero is generated by coupling between two resonators. A dual-band stopper filter based on open-circuit / short-circuit coupling line is proposed. The causes of multiple out-of-band transmission poles are analyzed in detail by using the odd-even mode analysis method. On this basis, the capacitive tube is loaded and the upper stopband fixed invariant is designed. Lower stopband center frequency adjustable double band stopper filter. 3. Design of high selective wideband balanced filter: two high selective balanced filters with 4 and 6 transmission zeros are proposed in combination with open circuit / short circuit coupling line characteristics, which can achieve high common mode suppression in tripling frequency. The passband characteristic of the differential mode response and the suppression characteristic of the common mode response are mainly generated by the open-circuit coupling line of the loaded branch, and the transmission zeros are mainly generated by the two-channel signal energy cancellation and the loaded branch node.
【學(xué)位授予單位】：南京理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TN713

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8 劉s，

本文編號(hào)：2052897