雙頻段平面天線與濾波器的協(xié)同設(shè)計
發(fā)布時間：2018-11-02 18:00
【摘要】：在現(xiàn)代化無線通信系統(tǒng)中,無線通信設(shè)備終端已逐步演變成為個人化的智能設(shè)備,因此其中的射頻前端需要具備多功能且高性能的特點。作為射頻前端的關(guān)鍵部件,濾波器與天線已經(jīng)成為研究的熱點,向著損耗小、小型化、成本低、多頻段方向發(fā)展。一般的設(shè)計中,濾波器和天線是分別獨立設(shè)計的,并使其端口具有相同特性阻抗,然后直接連接。直接連接經(jīng)常會引起阻抗失配,使射頻前端的性能惡化,尤其是濾波器通帶邊緣,還會增加電路的插入損耗。為了避免阻抗失配,必須在兩元件間加入額外的匹配網(wǎng)絡(luò),這樣會加大電路尺寸,不利于小型化。隨著電路集成度不斷提高,為了實現(xiàn)小型化,希望能夠?qū)⑻炀�跟與其相鄰的濾波器集成到一個模塊中。為此,本文首先提出了一種新的小型化雙頻段濾波器設(shè)計方法,為了驗證其有效性,設(shè)計了一種應(yīng)用于WLAN的雙頻段濾波器,進(jìn)而提出了一種雙頻天線與濾波器協(xié)同設(shè)計的方法。本論文的內(nèi)容主要分以下幾部分：一、介紹了應(yīng)用于射頻通信系統(tǒng)中濾波器與天線的研究現(xiàn)狀,然后介紹了表征其響應(yīng)特性的幾個相關(guān)參數(shù)。二、提出了一種新的小型化雙頻濾波器的設(shè)計方法,為了驗證該方法可行,本文設(shè)計了一種基于階躍阻抗諧振器(SIR)結(jié)構(gòu)的雙頻濾波器,該濾波器工作于2.4GHz和5.2 GHz,反射系數(shù)都低于-20 dB,插入損耗小于1 dB,相對帶寬FBW均為20%,尺寸為6mm x 15 mm (0.08 λg1 x 0.19 λg1 λg1為第一通帶中心頻率的導(dǎo)波波長)。三、進(jìn)行了雙頻天線與濾波器的協(xié)同設(shè)計,即根據(jù)阻抗匹配原則對雙頻濾波器和天線同時進(jìn)行獨立設(shè)計,然后應(yīng)用本文提出的方法對其協(xié)同。即先將天線當(dāng)做濾波器負(fù)載,可將其作為影響濾波器響應(yīng)特性的關(guān)鍵參數(shù)之一,然后通過綜合考慮這幾個關(guān)鍵參數(shù)實現(xiàn)其性能指標(biāo),完成天線與濾波器的協(xié)同設(shè)計。為驗證該方法的可行性,進(jìn)行了基于階躍阻抗諧振器(SIR)結(jié)構(gòu)的雙頻濾波器與雙頻單極子天線的協(xié)同設(shè)計,工作于2.4 GHz和5.2 GHz,反射系數(shù)都低于-16 dB,相對帶寬FBW分別為10%,8%,尺寸為35 mm x 20 mm (0.44 λg1 x 0.25 λg1,λg1為第一通帶中心頻率的導(dǎo)波波長)。
[Abstract]:In modern wireless communication system, the terminal of wireless communication equipment has gradually evolved into a personalized intelligent device, so the RF front-end needs to have the characteristics of multi-function and high performance. As a key component of RF front-end, filters and antennas have become a hot research topic, and have been developed towards low loss, miniaturization, low cost and multi-frequency band. In a general design, filters and antennas are designed independently, with the same characteristic impedance on their ports, and then connected directly. Direct connection often leads to impedance mismatch, which makes the performance of RF front end deteriorate, especially the filter passband edge, and increases the insertion loss of the circuit. In order to avoid impedance mismatch, an extra matching network must be added between the two components, which will increase the circuit size and is not conducive to miniaturization. With the increasing integration of circuits, in order to realize miniaturization, it is hoped that the antenna and the adjacent filter can be integrated into one module. In this paper, a new miniaturized dual-band filter design method is proposed in this paper. In order to verify its validity, a dual-band filter applied to WLAN is designed, and a cooperative design method of dual-band antenna and filter is proposed. The main contents of this thesis are as follows: firstly, the research status of filter and antenna used in RF communication system is introduced, and then some related parameters to characterize their response characteristics are introduced. Secondly, a new design method of miniaturized dual-frequency filter is proposed. In order to verify the feasibility of the method, a dual-frequency filter based on step impedance resonator (SIR) structure is designed. The filter works on 2.4GHz and 5.2 GHz,. The reflection coefficients are lower than -20 dB, and the insertion loss is less than 1 dB,. The relative bandwidth FBW is 20. The dimension is 6mm x 15 mm (0.08 位 g 1 x 0.19 位 g 1 位 g 1 is the guiding wave wavelength of the center frequency of the first pass band). Thirdly, the cooperative design of dual-frequency antenna and filter is carried out, that is, according to the principle of impedance matching, the dual-frequency filter and antenna are designed independently at the same time, and then the method proposed in this paper is applied to the cooperation. That is to say, the antenna is regarded as the filter load, which can be regarded as one of the key parameters that affect the response characteristics of the filter. Then, the performance index of the antenna and the filter is realized by considering these key parameters synthetically, and the cooperative design of the antenna and filter is completed. To verify the feasibility of this method, a cooperative design of dual-frequency filter and dual-frequency monopole antenna based on step impedance resonator (SIR) structure is carried out. The reflection coefficients of 2.4 GHz and 5.2 GHz, are lower than -16 dB,. The relative bandwidth FBW is 10 and 8, the dimension is 35 mm x 20 mm (0.44 位 g 1 x 0.25 位 g 1, 位 g 1 is the guided wave wavelength of the center frequency of the first pass band).
【學(xué)位授予單位】：山西大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TN823.27;TN713
本文編號：2306534
[Abstract]:In modern wireless communication system, the terminal of wireless communication equipment has gradually evolved into a personalized intelligent device, so the RF front-end needs to have the characteristics of multi-function and high performance. As a key component of RF front-end, filters and antennas have become a hot research topic, and have been developed towards low loss, miniaturization, low cost and multi-frequency band. In a general design, filters and antennas are designed independently, with the same characteristic impedance on their ports, and then connected directly. Direct connection often leads to impedance mismatch, which makes the performance of RF front end deteriorate, especially the filter passband edge, and increases the insertion loss of the circuit. In order to avoid impedance mismatch, an extra matching network must be added between the two components, which will increase the circuit size and is not conducive to miniaturization. With the increasing integration of circuits, in order to realize miniaturization, it is hoped that the antenna and the adjacent filter can be integrated into one module. In this paper, a new miniaturized dual-band filter design method is proposed in this paper. In order to verify its validity, a dual-band filter applied to WLAN is designed, and a cooperative design method of dual-band antenna and filter is proposed. The main contents of this thesis are as follows: firstly, the research status of filter and antenna used in RF communication system is introduced, and then some related parameters to characterize their response characteristics are introduced. Secondly, a new design method of miniaturized dual-frequency filter is proposed. In order to verify the feasibility of the method, a dual-frequency filter based on step impedance resonator (SIR) structure is designed. The filter works on 2.4GHz and 5.2 GHz,. The reflection coefficients are lower than -20 dB, and the insertion loss is less than 1 dB,. The relative bandwidth FBW is 20. The dimension is 6mm x 15 mm (0.08 位 g 1 x 0.19 位 g 1 位 g 1 is the guiding wave wavelength of the center frequency of the first pass band). Thirdly, the cooperative design of dual-frequency antenna and filter is carried out, that is, according to the principle of impedance matching, the dual-frequency filter and antenna are designed independently at the same time, and then the method proposed in this paper is applied to the cooperation. That is to say, the antenna is regarded as the filter load, which can be regarded as one of the key parameters that affect the response characteristics of the filter. Then, the performance index of the antenna and the filter is realized by considering these key parameters synthetically, and the cooperative design of the antenna and filter is completed. To verify the feasibility of this method, a cooperative design of dual-frequency filter and dual-frequency monopole antenna based on step impedance resonator (SIR) structure is carried out. The reflection coefficients of 2.4 GHz and 5.2 GHz, are lower than -16 dB,. The relative bandwidth FBW is 10 and 8, the dimension is 35 mm x 20 mm (0.44 位 g 1 x 0.25 位 g 1, 位 g 1 is the guided wave wavelength of the center frequency of the first pass band).
【學(xué)位授予單位】：山西大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TN823.27;TN713
【參考文獻(xiàn)】
相關(guān)博士學(xué)位論文 前1條
1 位朝壘;新型微波濾波器關(guān)鍵技術(shù)研究[D];電子科技大學(xué);2013年
相關(guān)碩士學(xué)位論文 前2條
1 底浩;基于頻率變換法的多通帶微波濾波器綜合方法研究[D];西安電子科技大學(xué);2010年
2 劉建華;寬帶天線與濾波天線研究與設(shè)計[D];南京航空航天大學(xué);2012年
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