【摘要】：微波與射頻通信技術(shù)的發(fā)展,讓我們的生活更加便利。然而,這一技術(shù)面臨的瓶頸是有限的頻率資源與頻間串擾。帶阻濾波器作為一種頻率選擇性器件,能抑制不需要的頻段,它的性能通常影響通信系統(tǒng)的功能。另一方面,通信系統(tǒng)處理過程中面臨著噪聲的干擾,噪聲制約了信號處理過程中所能識別的最小信號電平。平衡濾波器相對于傳統(tǒng)的單端電路而言,最明顯的優(yōu)勢就是較強的共模抑制,使得系統(tǒng)免受環(huán)境噪聲的干擾。在通信系統(tǒng)設(shè)備向著微型化、低損耗、抗噪聲和集成化發(fā)展的趨勢下,平衡濾波器的研究正逐漸成為一個熱門課題。本文基于平面微帶結(jié)構(gòu),主要研究了帶阻濾波器和平衡濾波器的實現(xiàn)方法。本文主要創(chuàng)新工作內(nèi)容有:(1)高選擇性帶阻濾波器的研究。帶阻濾波器是平衡濾波器的設(shè)計基礎(chǔ),本文在傳統(tǒng)枝節(jié)線帶阻濾波器的基礎(chǔ)上通過嵌入枝節(jié)引入多路徑,設(shè)計寬帶帶阻或雙頻帶阻濾波器。這種多路徑信號干擾結(jié)構(gòu)不僅具備高陡峭性,此外由于采用內(nèi)嵌結(jié)構(gòu)減少尺寸。(2)提出采用源負載耦合設(shè)計具四個可控傳輸零點的平衡帶通濾波器,改善通帶的選擇性和共模抑制效果。(3)提出了兩種改進型耦合饋線并將其運用在高選擇性高共模抑制平衡帶通濾波器的設(shè)計中。改進型耦合饋線是在傳統(tǒng)耦合線的基礎(chǔ)上,通過加載短路/開路枝節(jié),使得濾波器在差模/共模時表現(xiàn)帶通/帶阻響應(yīng),從而實現(xiàn)輸入端的平衡饋電。為實現(xiàn)更高的選擇性,耦合枝節(jié)及其加載的諧振器結(jié)構(gòu)也被應(yīng)用在平衡濾波器設(shè)計中。(4)提出基于多層介質(zhì)板的背對背結(jié)構(gòu)的寬帶平衡濾波器。槽線階躍阻抗諧振器(SIR)實現(xiàn)強耦合,背對背的微帶SIR諧振器分開差模和共模諧振頻率,同時帶外引入兩個傳輸零點,實現(xiàn)高選擇性差模通帶和共模抑制。(5)研究槽線結(jié)構(gòu)在平衡濾波器設(shè)計中的應(yīng)用。首先提出基于槽線結(jié)構(gòu)和嵌入枝節(jié)的小型化多陷波超寬帶平衡濾波器,通過控制槽線諧振器的三個諧振模式和微帶-槽線耦合結(jié)構(gòu),實現(xiàn)覆蓋UWB頻帶的差模通帶。再者,利用嵌入的枝節(jié)實現(xiàn)陷波,通過控制嵌入枝節(jié)的長度和偏移可以獨立調(diào)節(jié)陷波頻率和衰減水平。此外,提出槽線耦合饋電結(jié)構(gòu),并將其應(yīng)用在多頻平衡濾波器和平衡雙工器中。
[Abstract]:The development of microwave and RF communication technology makes our life more convenient. However, the bottleneck of this technology is limited frequency resources and inter-frequency crosstalk. As a kind of frequency selective device, band-stop filter can suppress unnecessary frequency band, and its performance usually affects the function of communication system. On the other hand, the communication system faces the interference of noise in the process of processing, which restricts the minimum signal level that can be recognized in the process of signal processing. Compared with the traditional single-ended circuits, the most obvious advantage of the balanced filter is the strong common mode suppression, which makes the system free from environmental noise. With the development of communication system equipment towards miniaturization, low loss, anti-noise and integration, the research of balanced filter is becoming a hot topic. In this paper, based on planar microstrip structure, the realization methods of band-stop filter and balanced filter are studied. The main contents of this paper are as follows: (1) the research of high selective bandstop filter. The band-stop filter is the basis of the design of the balanced filter. Based on the traditional branch line-band-stop filter, this paper designs a wideband band-stop or dual-band band-stop filter by introducing the multi-path into the embedded branch of the band-stop filter. This multipath signal interference structure not only has high steepness, but also uses embedded structure to reduce the size. (2) A balanced bandpass filter with four controllable transmission zeros is designed by using source-load coupling. (3) two kinds of improved coupling feeders are proposed and applied to the design of high selectivity and high common mode suppression balanced bandpass filters. The improved coupling feeder is based on the traditional coupling line. By loading the short-circuit / open-circuit branch, the filter performs the band-pass / band-stop response in the differential mode / common mode, thus realizing the balanced feed at the input end. In order to achieve higher selectivity, coupled segments and their loaded resonator structures are also applied in the design of balanced filters. (4) Broadband balanced filters with back-to-back structure based on multilayer dielectric plates are proposed. The slot line step impedance resonator (SIR) realizes strong coupling. The back-to-back microstrip SIR resonator separates the differential mode from the common mode resonance frequency and introduces two transmission zeros out of the band. High selectivity differential mode pass band and common mode suppression are realized. (5) the application of slot structure in the design of balanced filter is studied. Firstly, a miniaturized multi-notch ultra-wideband balanced filter based on slot structure and embedded branch is proposed. By controlling the three resonant modes of slot resonator and the coupling structure of microstrip and slot line, the differential mode pass band covering UWB band is realized. Furthermore the notch frequency and attenuation level can be adjusted independently by controlling the length and migration of the embedded branch. In addition, the slot line coupling feed structure is proposed and applied to the multi-frequency balanced filter and balanced Duplexer.
【學位授予單位】：華南理工大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TN713

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本文編號：2221006