微波平面多通帶濾波器的研究
發(fā)布時間：2018-09-09 12:00
【摘要】：無線通信技術(shù)的不斷發(fā)展,使有限的頻譜資源更加擁擠。在這種情況下,能夠同時工作在多個頻段的通信設(shè)備已經(jīng)成為研究的熱點。由于現(xiàn)代通信系統(tǒng)中的微波電路更加復(fù)雜,器件和模塊的集成度不斷提高,傳統(tǒng)的器件結(jié)構(gòu)和模塊正面臨著“轉(zhuǎn)型”和“升級”的挑戰(zhàn)。作為多頻接收機前端的重要器件之一,多通帶濾波器的選頻特性直接影響整個通信系統(tǒng)的性能。微波平面多通帶濾波器不僅能夠同時提取帶內(nèi)信號和抑制雜散、干擾信號,還能夠和平面電路集成,極大地降低通信設(shè)備的體積和成本,逐漸獲得眾多專家學(xué)者的關(guān)注。階梯阻抗諧振器(SIR)不僅可以通過調(diào)節(jié)阻抗比和電長度控制諧振頻率,而且可以和四分之一波長諧振器(QWR),缺陷地結(jié)構(gòu)(DGS),加載短路枝節(jié)諧振器(SSLR)和加載開路枝節(jié)諧振器(OSLR)集成在一起,為多頻帶濾波器的綜合和設(shè)計提供了廣闊的舞臺。本文根據(jù)SIR的諧振特性,研究了其在多頻帶濾波器中的應(yīng)用。本文首先研究了雙節(jié)SIR的諧振特性,將雙節(jié)SIR的輸入導(dǎo)納表達為幾個因式相乘的形式;還研究了三節(jié)SIR和三節(jié)SIR加載開路枝節(jié)的諧振特性,以及廣義切比雪夫函數(shù)和準帶通節(jié)的相關(guān)理論;同時研究了其應(yīng)用于多通帶濾波器的實現(xiàn)方式。通過在三節(jié)階梯阻抗諧振器上加載開路枝節(jié),綜合并設(shè)計了雙通帶濾波器,在此基礎(chǔ)上,通過微調(diào)阻抗比,改進饋電方式,設(shè)計了寬阻帶的雙帶通濾波器,進一步研究發(fā)現(xiàn),在地表面蝕刻缺陷地結(jié)構(gòu)實現(xiàn)了超寬帶外抑制的雙通帶濾波器。然后,利用雙節(jié)SIR和QWR構(gòu)成兩路交叉耦合路徑,同時,利用DGS結(jié)構(gòu)精準控制耦合系數(shù)設(shè)計了三通帶濾波器,產(chǎn)生了8個傳輸零點,獲得了高頻率選擇特性和帶外抑制。最后,利用準帶通節(jié)級聯(lián)設(shè)計了高選擇性可重構(gòu)雙通帶濾波器,利用NRN之間的耦合取代傳統(tǒng)的諧振器之間的耦合,提高了濾波器的調(diào)頻范圍,濾波器的中心頻率和傳輸零點都可以通過調(diào)節(jié)可調(diào)薄膜電容調(diào)節(jié)。通過測量,濾波器的帶外抑制超過60dB,在部分工作狀態(tài)下,帶外抑制度甚至能夠達到78dB。本文采用EM仿真軟件進行濾波器的設(shè)計,同時采用標準PCB工藝加工濾波器,最后用HP8510B矢量網(wǎng)絡(luò)分析儀進行測試。測試數(shù)據(jù)與仿真結(jié)果很好的吻合,證明了本文提出的設(shè)計方案的合理性和可行性。
[Abstract]:With the development of wireless communication technology, the limited spectrum resources become more crowded. In this case, the communication equipment that can work simultaneously in multiple frequency bands has become a hot research topic. As the microwave circuits in modern communication systems are more complex and the integration of devices and modules is increasing, the traditional device structures and modules are facing the challenge of "transformation" and "upgrading". As one of the most important devices in the front end of multi-frequency receiver, the frequency-selecting characteristics of multi-band filter directly affect the performance of the whole communication system. Microwave planar multiband filter can not only extract in-band signals and suppress stray and interference signals simultaneously, but also integrate with planar circuits, which greatly reduces the volume and cost of communication equipment, and gradually attracts the attention of many experts and scholars. The step impedance resonator (SIR) can not only control the resonant frequency by adjusting the impedance ratio and electric length. Moreover, it can be integrated with the (DGS), loaded short-circuit branch resonator (SSLR) and the open-circuit branch resonator (OSLR), which provides a broad stage for the synthesis and design of the multi-band filter. According to the resonance characteristic of SIR, the application of SIR in multi-band filter is studied in this paper. In this paper, we first study the resonant characteristics of the two-section SIR, and express the input admittance of the two-section SIR as several factorial multiplications, and study the resonant characteristics of the three-section SIR and the three-section SIR loaded open branch. The theory of the generalized Chebyshev function and the quasi-band-pass joint is also discussed, and the realization of the multi-pass filter is also studied. By loading open branch section on three step impedance resonators, a double pass band filter is synthesized and designed. On the basis of this, a wide stopband double band filter is designed by fine-tuning impedance ratio and improving the feed mode. A double pass band filter with UWB external suppression is realized by etching the defective ground structure on the ground surface. Then, two cross-coupling paths are constructed by using two-section SIR and QWR. At the same time, the three-way band filter is designed by using the DGS structure to control the coupling coefficient accurately. Eight transmission zeros are generated, and the high frequency selection characteristics and out-of-band suppression are obtained. Finally, a highly selective reconfigurable double pass band filter is designed by using the quasi band-pass node cascade. The coupling between the NRN and the traditional resonator is used instead of the coupling between the traditional resonators, which improves the frequency modulation range of the filter. The center frequency and transmission zero of the filter can be adjusted by adjusting the tunable film capacitance. The out-of-band suppression of the filter is more than 60 dB, and in some cases, the suppression degree can even reach 78 dB. In this paper, EM simulation software is used to design the filter, and the standard PCB process is used to process the filter. Finally, HP8510B vector network analyzer is used to test the filter. The test data are in good agreement with the simulation results, which proves the rationality and feasibility of the design scheme proposed in this paper.
【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
[Abstract]:With the development of wireless communication technology, the limited spectrum resources become more crowded. In this case, the communication equipment that can work simultaneously in multiple frequency bands has become a hot research topic. As the microwave circuits in modern communication systems are more complex and the integration of devices and modules is increasing, the traditional device structures and modules are facing the challenge of "transformation" and "upgrading". As one of the most important devices in the front end of multi-frequency receiver, the frequency-selecting characteristics of multi-band filter directly affect the performance of the whole communication system. Microwave planar multiband filter can not only extract in-band signals and suppress stray and interference signals simultaneously, but also integrate with planar circuits, which greatly reduces the volume and cost of communication equipment, and gradually attracts the attention of many experts and scholars. The step impedance resonator (SIR) can not only control the resonant frequency by adjusting the impedance ratio and electric length. Moreover, it can be integrated with the (DGS), loaded short-circuit branch resonator (SSLR) and the open-circuit branch resonator (OSLR), which provides a broad stage for the synthesis and design of the multi-band filter. According to the resonance characteristic of SIR, the application of SIR in multi-band filter is studied in this paper. In this paper, we first study the resonant characteristics of the two-section SIR, and express the input admittance of the two-section SIR as several factorial multiplications, and study the resonant characteristics of the three-section SIR and the three-section SIR loaded open branch. The theory of the generalized Chebyshev function and the quasi-band-pass joint is also discussed, and the realization of the multi-pass filter is also studied. By loading open branch section on three step impedance resonators, a double pass band filter is synthesized and designed. On the basis of this, a wide stopband double band filter is designed by fine-tuning impedance ratio and improving the feed mode. A double pass band filter with UWB external suppression is realized by etching the defective ground structure on the ground surface. Then, two cross-coupling paths are constructed by using two-section SIR and QWR. At the same time, the three-way band filter is designed by using the DGS structure to control the coupling coefficient accurately. Eight transmission zeros are generated, and the high frequency selection characteristics and out-of-band suppression are obtained. Finally, a highly selective reconfigurable double pass band filter is designed by using the quasi band-pass node cascade. The coupling between the NRN and the traditional resonator is used instead of the coupling between the traditional resonators, which improves the frequency modulation range of the filter. The center frequency and transmission zero of the filter can be adjusted by adjusting the tunable film capacitance. The out-of-band suppression of the filter is more than 60 dB, and in some cases, the suppression degree can even reach 78 dB. In this paper, EM simulation software is used to design the filter, and the standard PCB process is used to process the filter. Finally, HP8510B vector network analyzer is used to test the filter. The test data are in good agreement with the simulation results, which proves the rationality and feasibility of the design scheme proposed in this paper.
【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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