【摘要】：由于無線通信的迅速發(fā)展,各種通信模式及業(yè)務并存,無線通信系統(tǒng)對多帶多模的可重構(gòu)射頻前端的需求日益迫切。作為可重構(gòu)射頻前端的核心器件之一,可調(diào)射頻濾波器承擔著頻率選擇或者抑制的重要作用。因此,研究高選擇性、高可調(diào)范圍以及小型化的射頻濾波器具有十分重要的意義。本論文首先研究了加載變?nèi)莨芸烧{(diào)的平面濾波器,繼而研究了磁可調(diào)的SIW(Substrate Integrated Waveguide)濾波器。由于收發(fā)機的帶寬常常保持不變,因此在上述的可調(diào)濾波器中,我們通過常帶寬機制,來保證可調(diào)過程中濾波器的絕對帶寬或者分形帶寬不變,提高可調(diào)濾波器的實用性,同時使得可調(diào)外設(shè)電路簡化,減小整體尺寸。之后,研究了 SIW結(jié)構(gòu)垂直耦合情況下的電磁耦合實現(xiàn)方式,在此基礎(chǔ)上設(shè)計諧波抑制以及高選擇性的緊湊型SIW濾波器。本論文主要的研究內(nèi)容包括:(1)電可調(diào)帶通濾波器:首先提出了單通帶以及雙通帶常帶寬可調(diào)濾波器的設(shè)計方法,并且雙帶濾波器的兩個通帶能夠獨立可調(diào)。其中單通帶可調(diào)帶通濾波器是由加載變?nèi)莨艿臒o接地諧振環(huán)實現(xiàn),雙通帶帶通濾波器是由兩個雙模諧振器組成,通過控制諧振器的奇偶模來選擇雙帶選擇性以及控制可調(diào)過程中的帶寬。所設(shè)計的兩款濾波器都具有調(diào)諧率高以及控制電路簡單的特性。(2)電可調(diào)帶阻濾波器:首先提出了中心頻率和帶寬能夠獨立可控的單帶以及雙帶帶阻諧振單元,然后結(jié)合緊湊型的級聯(lián)結(jié)構(gòu)分別實現(xiàn)二階以及三階單帶帶阻濾波器、雙帶帶阻濾波器。所提出的濾波器均有中心頻率和帶寬獨立可控,尺寸緊湊的優(yōu)點。在此基礎(chǔ)上,提出了可調(diào)帶阻濾波器的設(shè)計方法,并通過對可調(diào)過程中帶阻諧振單元的帶寬以及耦合系數(shù)的分析,最終實現(xiàn)常帶寬的二階以及三階單帶可調(diào)帶阻濾波器。所設(shè)計的可調(diào)帶阻濾波器具有帶內(nèi)抑制能力高,尺寸緊湊的特點。(3)結(jié)合帶阻單元的電可調(diào)帶通濾波器:首先提出了三階常帶寬可調(diào)帶通濾波器的設(shè)計方法,繼而將帶阻單元與可調(diào)帶通濾波器相結(jié)合,來產(chǎn)生額外的傳輸零點來抑制出現(xiàn)在通帶附近的強干擾信號。由于帶阻單元的中心頻率能夠通過加載到其上的電容來靈活控制,因此產(chǎn)生的傳輸零點可以靈活控制,并且在濾波器通帶調(diào)諧過程中保持不變。整體濾波器的尺寸緊湊,控制電路簡單。(4)磁可調(diào)SIW濾波器:首先詳細分析了不同磁偏置下鐵氧體等效磁導率的變化,然后根據(jù)SIW高次模的磁場分布來選擇合適的加載位置實現(xiàn)磁可調(diào)的工作于高次模TE202的諧振器,繼而對諧振器之間的耦合結(jié)構(gòu)進行合理設(shè)計,最終實現(xiàn)磁可調(diào)的常帶寬的SIW高次模可調(diào)濾波器。該高次�？烧{(diào)濾波器在同等的加工工藝下能夠?qū)崿F(xiàn)較高頻率的設(shè)計。(5)多層SIW帶通濾波器:首先詳細分析了垂直耦合狀態(tài)下SIW諧振器內(nèi)的電磁場分布,繼而提出了基模以及高次模之間電耦合、磁耦合以及混合耦合的設(shè)計方法。在此基礎(chǔ)上,根據(jù)垂直耦合狀態(tài)下基模以及高次模耦合系數(shù)相對獨立的特性,分別設(shè)計了兩款諧波抑制的帶通濾波器以及一款高階交叉耦合并帶有諧波抑制的帶通濾波器。所提出的濾波器具有結(jié)構(gòu)緊湊,帶外抑制能力高以及高選擇性的特點。本論文所提出的各種新型的電磁可調(diào)濾波器對研究寬調(diào)諧范圍以及高選擇性的可調(diào)濾波器具有一定的指導作用,而且在可調(diào)過程中都能保持常帶寬特性,具有易于調(diào)控的特點。同時,本文設(shè)計的多層SIW濾波器結(jié)構(gòu)緊湊,選擇性以及帶外抑制能力高,具有廣闊的應用的前景。
[Abstract]:Due to the rapid development of wireless communication and the coexistence of various communication modes and services, the demand of the wireless communication system for multi-band multi-mode reconfigurable radio-frequency front-end is becoming more and more urgent. As one of the core components of the reconfigurable radio-frequency front-end, the tunable RF filter plays an important role in frequency selection or suppression. Therefore, it is of great significance to study the high-selectivity, high-adjustable range and the miniaturized radio-frequency filter. In this paper, the adjustable planar filter of the loading variable-volume tube is first studied, and then the magnetic adjustable SIW (Subrate Integrated) filter is also studied. since the bandwidth of the transceiver is often kept constant, in the above-mentioned tunable filter, the absolute bandwidth or the fractal bandwidth of the filter in the adjustable process is guaranteed to be unchanged through the constant-bandwidth mechanism, the practicability of the adjustable filter is improved, and the adjustable peripheral circuit is simplified, The overall size is reduced. Then, the implementation of the electromagnetic coupling in the vertical coupling of the SIW structure is studied, and the harmonic suppression and the high-selectivity compact SIW filter are designed. The main research contents of this thesis include: (1) an electrically tunable band-pass filter: firstly, a design method of a single-pass band and a double-pass band constant-bandwidth adjustable filter is proposed, and the two pass-bands of the dual-band filter can be independently adjustable. In which a single-pass band-adjustable band-pass filter is realized by a non-grounded resonant ring loaded with a varactor, the dual-pass band-pass filter is composed of two dual-mode resonators, and the dual-band selectivity is selected by controlling the parity mode of the resonator and the bandwidth in the adjustable process is controlled. Both filters are designed with a high tuning rate and a simple control circuit. (2) Electric tunable band-stop filter: First, a single band with independent and controllable center frequency and bandwidth and a double band band-stop resonance unit are proposed, and then the second order and the third order single band band-stop filter and the double-band band-stop filter can be realized in combination with the compact cascade structure. The proposed filter has the advantages of independent and controllable center frequency and bandwidth and compact size. On this basis, the design method of the adjustable band-stop filter is proposed, and the second order and the third order single-band adjustable band-stop filter with constant bandwidth are finally realized by analyzing the bandwidth and the coupling coefficient of the band-blocking resonance unit in the adjustable process. The adjustable band-stop filter has the characteristics of high in-band rejection capability and compact size. And (3) combining the band-stop unit with an adjustable band-pass filter, which comprises the following steps of: firstly, a design method of a third-order constant-bandwidth adjustable band-pass filter is proposed, and the band-blocking unit is combined with an adjustable band-pass filter to generate an extra transmission zero point to suppress the strong interference signal appearing near the pass band. Since the center frequency of the band-stop unit can be flexibly controlled by the capacitance loaded thereto, the generated transmission zeroes can be flexibly controlled and remain unchanged during the filter pass-band tuning process. The overall filter is compact in size and simple in control circuit. (4) the magnetic adjustable SIW filter: first, the change of the equivalent magnetic permeability of the ferrite under different magnetic bias is analyzed in detail, and then the proper loading position is selected according to the magnetic field distribution of the SIW high order mode to realize the magnetic adjustable resonator of the high-order mode TE202, And then the coupling structure between the resonators is reasonably designed, and finally, the adjustable filter of the SIW high-order mode with the constant bandwidth of the magnetic adjustable is realized. The high-order mode tunable filter can achieve higher frequency design under the same processing technology. (5) Multi-layer SIW band-pass filter: firstly, the electromagnetic field distribution in the SIW resonator in the vertical coupling state is analyzed in detail, and then the design method of the electrical coupling, the magnetic coupling and the hybrid coupling between the base mode and the high-order mode is proposed. On this basis, two harmonic suppression band-pass filters and a band-pass filter with high order cross-coupling and harmonic suppression are designed according to the characteristics of the fundamental mode and the high-order mode coupling coefficient in the vertical coupling state. The proposed filter has the characteristics of compact structure, high out-of-band rejection capability and high selectivity. The novel electromagnetic tunable filter proposed in this paper has a certain guiding function to the wide tuning range of the research and the tunable filter with high selectivity, and can keep the characteristic of constant bandwidth in the adjustable process, and has the characteristics of easy regulation and control. At the same time, the multi-layer SIW filter designed in this paper has the advantages of compact structure, high selectivity and high out-of-band rejection capability, and has wide application prospect.
【學位授予單位】：西南交通大學
【學位級別】：博士
【學位授予年份】：2017
【分類號】：TN713

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本文編號：2485283