發(fā)布時間：2018-11-04 15:42

【摘要】：近些年,隨著無線通信系統(tǒng)的快速發(fā)展,超寬帶、結(jié)構(gòu)緊湊、低成本不斷成為射頻前端電路的設(shè)計重點。這就使得具有超寬帶、易集成特性的新型微波無源器件如超寬帶巴倫等正成為當(dāng)前國內(nèi)外的研究熱點。本文提出了兩種新型超寬帶巴倫。其中微帶線-槽線巴倫采用了兩種不同形式的微帶線到槽線的過渡實現(xiàn)了巴倫的功能,具有良好的幅度平衡特性和兩個輸出端口180度相位差。為了驗證巴倫性能,本文將微帶線-槽線巴倫集成到超寬帶Vivaldi天線中,實現(xiàn)了天線和巴倫的一體化設(shè)計。其中微帶線-共面波導(dǎo)巴倫中,采用了兩種過渡結(jié)構(gòu)(微帶線-共面波導(dǎo)過渡結(jié)構(gòu)和微帶線-共面帶狀線過渡結(jié)構(gòu))實現(xiàn)平衡輸出端口180度的相位差。進一步的,為了驗證微帶線-共面波導(dǎo)巴倫的特性,設(shè)計了一個三模差分貼片天線并實現(xiàn)其與巴倫的一體化設(shè)計。此外,本文提出了一種新型的兼具濾波性能和巴倫性能的多模巴倫帶通濾波器(BPF)。該巴倫帶通濾波器不僅采用了所設(shè)計的微帶線-共面波導(dǎo)巴倫中的過渡結(jié)構(gòu)實現(xiàn)巴倫特性,還引入了多模階梯阻抗諧振器(SIR)和平行耦合結(jié)構(gòu)實現(xiàn)三模帶通濾波器特性。本文借助全波電磁仿真軟件ANSOFT HFSS 13對所設(shè)計的兩種新型超寬帶巴倫及它們的應(yīng)用進行了優(yōu)化仿真,并對最后優(yōu)化的結(jié)構(gòu)進行了加工和測試。其中,微帶線-槽線巴倫的仿真和測試結(jié)果十分吻合,結(jié)果表明該巴倫的帶寬是從3.6 GHz到10.7GHz,通帶內(nèi)兩個平衡端口的幅度差小于0.5 dB,相位差在180°±6°以內(nèi)。而且,集成了巴倫的Vivaldi天線能夠工作在3.6 GHz到11.2 GHz,在通帶范圍內(nèi)具有良好的輻射性能。對于微帶線-共面波導(dǎo)巴倫,仿真和測試的結(jié)果表明該巴倫能夠工作在0.2 GHz到5.2 GHz(26：1)的超寬頻帶內(nèi),幅度不平衡性在0.4 dB以內(nèi),相位差優(yōu)于180°±2°。集成了微帶線-共面波導(dǎo)巴倫的三模差分貼片天線實現(xiàn)了45%的帶寬,從而驗證了該巴倫的工作性能。另外,對所設(shè)計的巴倫濾波器進行了測試,結(jié)果表明該超寬帶巴倫濾波器不僅在1.86 GHz和3.7 GHz有兩個傳輸零點實現(xiàn)了高選擇性,而且具有良好的平衡性,通帶內(nèi)的幅度不平衡度優(yōu)于0.5 dB,相位不平衡度在5度以內(nèi)。這兩種新型巴倫具有超寬帶、低插損、結(jié)構(gòu)緊湊和平衡特性良好的特點。因此,所提出的新型巴倫及它們的應(yīng)用能夠在射頻通信系統(tǒng)中得到廣泛使用。
[Abstract]:In recent years, with the rapid development of wireless communication systems, ultra-wideband (UWB), compact structure and low cost have become the focus of RF front-end circuit design. As a result, new microwave passive devices such as UWB Barron with ultra-wideband (UWB) and easy to integrate (UWB) characteristics are becoming the research focus at home and abroad. In this paper, two new types of UWB Barron are proposed. Two different forms of transition from microstrip line to slot line are used to realize the function of Barron, which has good amplitude balance and 180 degree phase difference between two output ports. In order to verify the performance of Barron, the microstrip line-slot Barron is integrated into the ultra-wideband Vivaldi antenna, and the integrated design of the antenna and Barron is realized. Two kinds of transition structures (microstrip line-coplanar waveguide transition structure and microstrip line-coplanar strip line transition structure) are used in the microstrip line-coplanar waveguide Balun to realize the phase difference of 180 degrees at the output port. Furthermore, in order to verify the characteristics of microstrip line-coplanar waveguide Barron, a three-mode differential patch antenna is designed and integrated with Barron. In addition, this paper proposes a new multimode Barron band-pass filter (BPF). With both filtering performance and Barron performance. The Barron band-pass filter not only uses the transition structure in the microstrip line-coplanar waveguide Barron to realize the Barren characteristic, but also introduces the multi-mode step impedance resonator (SIR) and the parallel coupling structure to realize the three-mode band-pass filter. In this paper, two new UWB Barron and their applications are optimized and simulated by the full wave electromagnetic simulation software ANSOFT HFSS 13, and the final optimized structure is processed and tested. The simulation and test results of microstrip line-slot line Barron are in good agreement. The results show that the bandwidth of the microstrip line is from 3.6 GHz to 10.7 GHz, and the amplitude difference between the two balanced ports in the passband is less than 0.5 dB, phase difference within 180 擄鹵6 擄. Moreover, the Vivaldi antenna integrated with Barron can work in the range of 3. 6 GHz to 11. 2 GHz, with good radiation performance in the passband range. For microstrip line-coplanar waveguide Barron, the simulation and test results show that the Barron can work in the ultra-wide band of 0.2 GHz to 5.2 GHz (26:1), the amplitude unbalance is within 0.4 dB, and the phase difference is better than 180 擄鹵2 擄. The three-mode differential patch antenna integrated with microstrip line-coplanar waveguide Balun achieves a bandwidth of 45%, which verifies its performance. In addition, the designed Barron filter is tested. The results show that the UWB Barren filter not only has two transmission zeros at 1.86 GHz and 3.7 GHz, but also has a good balance. The amplitude unbalance in the passband is better than that in the 0. 5 dB, phase unbalance within 5 degrees. These two new Barron have the characteristics of ultra-wideband, low insertion loss, compact structure and good balance characteristics. Therefore, the proposed new Barron and their applications can be widely used in RF communication systems.
【學(xué)位授予單位】：南京理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：TN822.8
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本文編號：2310302