【摘要】：身處飛速發(fā)展的通信時(shí)代,頻譜資源的使用越來越廣泛,也導(dǎo)致剩余可用空間變得更加狹小,應(yīng)用于射頻領(lǐng)域的高性能的濾波器研究成為當(dāng)前熱點(diǎn)之一。商業(yè)通信與軍用通信系統(tǒng)對濾波器的各項(xiàng)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(diǎn),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(shè)計(jì)、仿真與實(shí)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(shè)計(jì)濾波器的原理并對陶瓷基板進(jìn)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(shí)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(diǎn)進(jìn)行系統(tǒng)分析,在理論基礎(chǔ)上分別設(shè)計(jì)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(jìn)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(xiàng)參數(shù)在Ansoft HFSS15中進(jìn)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(jìn)行實(shí)物加工并做測試。對實(shí)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(shí)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(diǎn),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(shí)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(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TN713

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