【摘要】：身處飛速發(fā)展的通信時代,頻譜資源的使用越來越廣泛,也導致剩余可用空間變得更加狹小,應用于射頻領(lǐng)域的高性能的濾波器研究成為當前熱點之一。商業(yè)通信與軍用通信系統(tǒng)對濾波器的各項性能提出了在滿足常規(guī)條件下更加苛刻的一些要求:高選擇性,低損耗,小型化。在軍用通信技術(shù)中,特別是基于陶瓷基板制作的微帶濾波器具有低插損,小尺寸,高可靠性等優(yōu)點,受到了越來越多的關(guān)注。我國的陶瓷濾波器起步晚,并且國外采取了技術(shù)封鎖,研究高品質(zhì)的陶瓷微帶濾波器具有廣泛前景。本論文系統(tǒng)研究了陶瓷基板材料的選擇與制備、微帶濾波器的設計、仿真與實物加工以及測試結(jié)果分析。首先系統(tǒng)介紹了用于制作濾波器的微波介電陶瓷材料的發(fā)展現(xiàn)狀以及制作陶瓷基板微帶濾波器的意義。分析設計濾波器的原理并對陶瓷基板進行遴選,最終確定了MgTiO_3系xMgO-y(Ca_(0.6)-La_(0.8/3)TiO_3)微波介質(zhì)陶瓷作為基板材料。確定比例為x:y=0.85:0.15時的最優(yōu)微波性能能:εr=25.0±0.5,Q×f大于50000 GHz(f=4.9 GHz),τf=0±2 ppm/oC。本論文對微帶線的基本特點進行系統(tǒng)分析,在理論基礎(chǔ)上分別設計了4階發(fā)卡型帶通濾波器和5階交指型帶通濾波器,并在Ansoft HFSS15中進行建模,仿真和優(yōu)化。本論文還系統(tǒng)把微波介電陶瓷的各項參數(shù)在Ansoft HFSS15中進行仿真,研究不同數(shù)值下的參數(shù)變化,帶來濾波器的插入損耗、回波損耗性能的變化情況。本論文的最后,將仿真好的濾波器進行實物加工并做測試。對實際測試結(jié)果與仿真差異做對比,并分析可能帶來差異性的原因;實際測試結(jié)果:(1)四階發(fā)夾型濾波器測試結(jié)果中心頻率在4.18 GHz,比4.2 GHz偏移一點,相對帶寬約為7%,帶內(nèi)插損為3.2 dB,上邊頻外阻帶抑制跟仿真結(jié)果幾乎一致,4.8 GHz處(|S21|)衰減大于30 dB,低頻段3.6 GHz處衰減大于30 dB,帶內(nèi)回波損耗較大(|S11|13 dB)。(2)五階交指型微帶帶通濾波器測試結(jié)果中心頻率為4.2 GHz,相對帶寬約為14%,帶內(nèi)插損為2.6 dB,上邊頻外阻帶抑制跟仿真結(jié)果一致,3.6 GHz處|S21|值衰減大于30 dB,4.8 GHz處|S21|值衰減大于40 dB,同時帶內(nèi)回波損耗較大(|S11|11dB)。
[Abstract]:In the era of rapid development of communication, the use of spectrum resources is becoming more and more extensive, which also leads to the narrow remaining available space. The research of high performance filter used in RF field has become one of the hot spots at present. Commercial and military communication systems have put forward some more stringent requirements for filter performance under conventional conditions: high selectivity, low loss and miniaturization. In military communication technology, especially the microstrip filter based on ceramic substrate has been paid more and more attention because of its advantages of low insertion loss, small size and high reliability. Due to the late start of ceramic filters in China and the technical blockade adopted by foreign countries, the study of high quality ceramic microstrip filters has broad prospects. In this paper, the selection and preparation of ceramic substrate, the design of microstrip filter, the simulation and physical processing, and the analysis of test results are systematically studied. Firstly, the development status of microwave dielectric ceramic materials used to fabricate filters and the significance of fabricating ceramic substrate microstrip filters are systematically introduced. The principle of filter design is analyzed and the ceramic substrate is selected. Finally, the microwave dielectric ceramics of MgTiO_3 system xMgO-y (Ca0.6 -La0.8 / 3 TiO_3) are selected as substrate materials. When the ratio of x: y = 0.85: 0.15 is determined, the optimal microwave performance can be obtained as follows: 蔚 rn 25.0 鹵0.5 Q 脳 f > 50000 GHz (fr 4.9 GHz), 蟿 fN 0 鹵2 ppm 路oc). In this paper, the basic characteristics of the microstrip line are systematically analyzed. On the basis of the theory, the fourth order bandpass filter and the fifth order cross-finger band-pass filter are designed, and the modeling, simulation and optimization are carried out in Ansoft HFSS15. In this paper, the parameters of microwave dielectric ceramics are simulated in Ansoft HFSS15, and the variation of parameters under different values is studied, which results in the insertion loss of filter and the change of the performance of echo loss. At the end of this paper, the simulated filter is processed and tested. The actual test results are compared with the simulation results, and the possible reasons for the differences are analyzed. (1) the center frequency of the test results of the fourth-order hairpin filter is 4.18 GHz, which is slightly offset to 4.2 GHz. The relative bandwidth is about 7, the band insertion loss is 3.2 dB, the upper side frequency external stopband suppression is almost in agreement with the simulation results, the attenuation at 4.8 GHz is greater than 30 dB, the attenuation at 3.6 GHz in low frequency band is more than 30 dB, and the intra-band echo loss is larger than 5 order cross finger microstrip with high in-band echo loss (G11 13 dB). (2). The center frequency of the bandpass filter is 4.2 GHz, the relative bandwidth is about 14, the band insertion loss is 2.6 dB, the attenuation of S21 value is greater than 30 dB, 4.8 GHz, and the attenuation of S21 value is more than 40 dB at 3. 6 GHz.
【學位授予單位】：電子科技大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TN713

【參考文獻】

相關(guān)期刊論文 前10條

1 劉海強;周立學;李良;;交指型微帶帶通濾波器的設計[J];電子科技;2014年07期

2 袁玉先;孫國泉;鐘仙鳳;;微帶發(fā)夾式帶通濾波器設計[J];電子科技;2012年12期

3 李艷江;吳孟強;彭森;周曉華;張樹人;;高可靠性發(fā)夾型帶通濾波器的設計與制作[J];電子元件與材料;2010年10期

4 李麗平;李玉山;賈琛;潘健;張木水;;耦合微帶線的散射參數(shù)特性分析[J];電子與信息學報;2008年11期

5 賈琳蔚;李曉云;丘泰;賈杪蕾;;微波介質(zhì)陶瓷分類及各體系研究進展[J];材料導報;2008年04期

6 吳堅強;涂鵬;;960MHz同軸介質(zhì)諧振器濾波器的研制[J];電子元件與材料;2008年03期

7 熊鋼;汪睿;;微波介質(zhì)陶瓷材料體系研究綜述[J];咸寧學院學報;2007年06期

8 童建喜;張啟龍;楊輝;孫慧萍;;摻Li_2O B_2O_3 SiO_2玻璃低溫燒結(jié)MgTiO_3 CaTiO_3陶瓷及其微波介電性能[J];硅酸鹽學報;2006年11期

9 尹雪帆;喻佑華;周川鈞;艾凡榮;丁銀忠;;微波介質(zhì)陶瓷材料發(fā)展綜述[J];中國陶瓷;2006年04期

10 田中青,劉韓星,王浩,余洪滔;燒結(jié)制度對Ba(Mg_(1/3)Nb(2/3))O_3陶瓷品質(zhì)因子的影響[J];武漢理工大學學報;2005年06期

相關(guān)碩士學位論文 前10條

1 于鵬飛;新型雙通帶平衡帶通濾波器的研究[D];浙江大學;2014年

2 劉韜;新型微波集成微帶帶通濾波器設計[D];電子科技大學;2013年

3 陳功田;高性能微波介質(zhì)陶瓷的研制及其在小型GPS天線中的應用[D];湖南大學;2012年

4 張鑫裴;無線傳感網(wǎng)射頻前端的可調(diào)濾波器小型化研究與設計[D];杭州電子科技大學;2012年

5 李艷江;陶瓷基微波帶通濾波器的設計與制作[D];電子科技大學;2011年

6 張宛路;微波濾波器的綜合與設計[D];西安電子科技大學;2011年

7 徐佳;交指型微帶帶通濾波器小型化研究[D];河北工業(yè)大學;2010年

8 鄭建森;利用微波能量原理的微波介質(zhì)陶瓷應用研究[D];廈門大學;2009年

9 楊璇;基于3G頻段收發(fā)系統(tǒng)前端的研制[D];南京理工大學;2008年

10 黃慰;交指型帶通濾波器的設計與研究[D];西南交通大學;2004年

，

本文編號：2169963