【摘要】：隨著無(wú)線通信技術(shù)的迅猛發(fā)展,移動(dòng)基站和其它射頻系統(tǒng)對(duì)微波器件的性能指標(biāo)要求越來(lái)越高,尤其是對(duì)微波濾波器的小型化,低損耗和高抑制的要求也越來(lái)越苛刻。而本文研究的多模介質(zhì)腔體濾波器具有一腔多模,體積復(fù)用的特點(diǎn),能夠?qū)崿F(xiàn)濾波器小型化;同時(shí)又具有高Q值的特點(diǎn),可以實(shí)現(xiàn)濾波器低損耗。所以本文的研究工作具有重要的工程應(yīng)用價(jià)值。本文對(duì)多模技術(shù)和介質(zhì)腔體濾波器做了若干研究與分析。首先,本文研究了一種基于開槽技術(shù)的TE01δ和HEH11模式(簡(jiǎn)并雙模)的三模介質(zhì)諧振器,并用于三模介質(zhì)腔體濾波器的設(shè)計(jì);其次,基于傳統(tǒng)柱形諧振器,研究了一種基于TE01δ和HEH11模式的三模雙通帶介質(zhì)腔體濾波器。具體研究?jī)?nèi)容如下:1.提出了在傳統(tǒng)柱狀介質(zhì)諧振器的45°/135°/225°/315°四個(gè)方向徑向開槽,使TE01δ模式與HEH11模式的諧振頻率同步,從而構(gòu)建了混合三模介質(zhì)諧振器;根據(jù)TE01和HEH11模式的不對(duì)稱電場(chǎng)結(jié)構(gòu),提出了在介質(zhì)諧振器表面設(shè)置微帶基板,并在基板上使用鐮刀型的金屬導(dǎo)帶電路耦合結(jié)構(gòu),從而構(gòu)建三模介質(zhì)腔體濾波器;在腔體中使用多個(gè)金屬調(diào)螺和介質(zhì)調(diào)螺實(shí)現(xiàn)各模式頻率的調(diào)諧,以及對(duì)耦合系數(shù)的調(diào)節(jié)。對(duì)三模介質(zhì)濾波器進(jìn)行了實(shí)物加工、裝配調(diào)試與測(cè)試。所得結(jié)果良好,實(shí)現(xiàn)了較低的損耗,并且濾波器的體積得到了縮減。2.基于傳統(tǒng)柱狀介質(zhì)諧振器,利用單模TE01δ和簡(jiǎn)并雙模HEH11分別實(shí)現(xiàn)兩個(gè)通帶,從而實(shí)現(xiàn)了三模雙通帶介質(zhì)腔體濾波器。在具體濾波器的實(shí)現(xiàn)中,利用由豎直圓柱金屬導(dǎo)體和弧形金屬導(dǎo)體組成的結(jié)構(gòu)作為輸入輸出端口耦合結(jié)構(gòu);利用雙電容探針結(jié)構(gòu)實(shí)現(xiàn)相鄰兩腔之間的TE01δ模式耦合以及兩腔中水平極化的HEH11模式耦合;利用一些金屬調(diào)螺實(shí)現(xiàn)各模式頻率的調(diào)諧,以及實(shí)現(xiàn)每個(gè)腔中簡(jiǎn)并雙模HEH11之間的耦合。通過(guò)實(shí)物加工、裝配調(diào)試和測(cè)試,得到了良好的測(cè)試結(jié)果,實(shí)現(xiàn)了濾波器的雙頻段工作,濾波器的體積也得到了縮減。3.此外,本文還研究了一種雙頻耦合器。提出了一種階梯阻抗平行耦合線,并將之用于任意耦合系數(shù)、大工作頻率比的雙頻耦合器的設(shè)計(jì)。其中分別設(shè)計(jì)了頻率比為1GHz/7.5GHz和1GHz/5.2GHz的20dB耦合度和6dB耦合度的雙頻耦合器。通過(guò)級(jí)聯(lián)多個(gè)對(duì)稱階梯阻抗平行耦合線,還可以實(shí)現(xiàn)寬帶雙頻耦合器。本文給出了設(shè)計(jì)方法和實(shí)例,對(duì)這三款耦合器分別進(jìn)行了實(shí)物加工,這三款耦合器都獲得了較低的回波損耗、較高的隔離度、較寬的帶寬,且其尺寸小于傳統(tǒng)的單頻耦合器。
[Abstract]:With the rapid development of wireless communication technology, mobile base stations and other radio frequency systems require more and more high performance of microwave devices, especially the miniaturization, low loss and high suppression of microwave filters. The multimode dielectric cavity filter studied in this paper has the characteristics of one cavity multimode and volume multiplexing which can realize the miniaturization of the filter and the characteristics of high Q value which can realize the low loss of the filter. So the research work of this paper has important engineering application value. In this paper, we do some research and analysis on multi-mode technology and dielectric cavity filter. Firstly, a three-mode dielectric resonator based on grooved TE01 未 and HEH11 mode (degenerate dual-mode) is studied and used in the design of three-mode dielectric cavity filter. A three mode double pass band dielectric cavity filter based on TE01 未 and HEH11 mode is studied. The specific contents of the study are as follows: 1. A hybrid three-mode dielectric resonator is constructed in the conventional cylindrical dielectric resonator with 45 擄/ 135 擄/ 225 擄/ 315 擄radial grooving in four directions to synchronize the resonant frequency of the TE01 未 mode with that of the HEH11 mode, and according to the asymmetric electric field structure of the TE01 and HEH11 modes, The microstrip substrate is set on the surface of the dielectric resonator and the three-mode dielectric cavity filter is constructed by using the sickle type metal conduction band circuit coupling structure on the substrate. In the cavity, a number of metal and dielectric snails are used to realize the tuning of each mode frequency and the adjustment of the coupling coefficient. The three-mode dielectric filter is manufactured, assembled, debugged and tested. The result is good, the loss is lower and the volume of filter is reduced. 2. Based on the traditional cylindrical dielectric resonator, the single-mode TE01 未 and degenerate dual-mode HEH11 are used to realize two passbands, respectively, and a three-mode double-passband dielectric cavity filter is realized. In the realization of the filter, the structure composed of vertical cylindrical metal conductor and arc metal conductor is used as the input and output port coupling structure. The TE01 未 mode coupling between two adjacent cavities and the horizontally polarized HEH11 mode coupling in two cavities are realized by using a double capacitance probe structure, and the frequency tuning of each mode is realized by using some metal snails, and the coupling between degenerate double mode HEH11 in each cavity is realized. Through physical processing, assembly debugging and testing, a good test result is obtained, and the dual-band operation of the filter is realized, and the size of the filter is reduced by .3. In addition, a dual frequency coupler is studied. A step impedance parallel coupling line is proposed and applied to the design of double frequency coupler with arbitrary coupling coefficient and large operating frequency ratio. Two frequency couplers with 20dB coupling degree and 6dB coupling degree with frequency ratio of 1GHz/7.5GHz and 1GHz/5.2GHz are designed respectively. Broadband dual frequency couplers can also be realized by cascading multiple symmetric step impedance parallel coupling lines. In this paper, a design method and an example are given, and the three couplers are processed respectively. The three couplers obtain lower return loss, higher isolation, wider bandwidth and smaller size than the traditional single-frequency coupler.
【學(xué)位授予單位】：南京航空航天大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TN713

【參考文獻(xiàn)】

相關(guān)期刊論文 前1條

1 張翼飛;陳曉光;崔立成;;四階雙模介質(zhì)濾波器的設(shè)計(jì)和分析[J];信息與電子工程;2009年03期

，

本文編號(hào)：2167617