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1、Jiangxi Province Key Laboratory - RF communications and sensor network 報(bào)告人：宋懿2016.06.17 Page 1 Compact Microstrip Tri-Band Bandpass Filter Using New Stubs Loaded Stepped-Impedance Resonator使用新型枝節(jié)加載階躍阻抗諧振器的緊湊微帶三通帶帶通濾波器 Abstract -摘要： 2 1. This letter presents a novel tri-band bandpass filter (TB-BPF)

2、based on proposed stubs loaded stepped-impedance resonator (SLSIR). The first three resonant modes of proposed SLSIR can be independently controlled by the shorted highimpedance section of SIR, the loaded open stub and the loaded shorted stub, respectively, resulting in the independency of central f

3、requencies and return losses of three passbands.中文：本文介紹了一個(gè)基于枝節(jié)加載階躍阻抗諧振器的新型三通帶濾波器。所提出的這個(gè)諧振器能產(chǎn)生三個(gè)模式；并且可以通過對階躍阻抗諧振器的短路高阻抗枝節(jié)、加載的開路枝節(jié)還有加載的短路枝節(jié)的單獨(dú)調(diào)整來實(shí)現(xiàn)三個(gè)模式的頻率單獨(dú)可控，從而實(shí)現(xiàn)濾波器三個(gè)通帶中心頻率和回波損耗的獨(dú)立可控。 2. As an example, a TB-BPF operating at 0.9/1.8/2.45 GHz are designed and fabricated. Due to the cancelling effect o

4、f mixed electric and magnetic coupling, the virtual grounds existed in SLSIR and the introduced embedded open stub, six transmission zeros are realized around three passbands, resulting in the high passband selectivity and band-to-band isolation. 中文：為了體現(xiàn)該諧振器的特性，本文設(shè)計(jì)并加工了一個(gè)中心頻率分別在0.9/1.8/2.45 GHz的三通帶濾

5、波器。由于階躍阻抗枝節(jié)加載諧振器的接地部分和所加載枝節(jié)的開路部分存在混合電磁耦合相位抵消，因此在三個(gè)通帶附近產(chǎn)生了六個(gè)傳輸零點(diǎn)，從而實(shí)現(xiàn)通帶的高選擇性和良好的通帶之間的隔離度。 Introduction1.Planar tri-band bandpass filter (TB-BPF) with compact size and high electrical performance is an essential component in modern multi-service communication system. Many works on TB-BPF have been rec

6、ently reported. The first three resonant modes of stub loaded stepped-impedance resonator (SLSIR) in 1 and open stub loaded tri-section /4 SIR in 2 were proposed to design TB-BPFs. However, the locations of resonant modes in 1 and 2 need a complicated optimization to acquire the desired frequency po

7、sitions. 中文：緊湊且電特性良好的平面三通帶帶通濾波器現(xiàn)代多業(yè)務(wù)通信系統(tǒng)中的關(guān)鍵器件。近些年來關(guān)于三通帶濾波器設(shè)計(jì)在微波界得到廣泛報(bào)道。文獻(xiàn)1首次提出了基于枝節(jié)加載階躍阻抗諧振器的三模諧振器。文獻(xiàn)2也提出了將枝節(jié)加載的短路的三節(jié)四分之一波長階躍阻抗諧振器用于三通帶濾波器設(shè)計(jì)。但是這兩篇文章提出的諧振器，都需要經(jīng) 過復(fù)雜的優(yōu)化過程才能將頻率固定在所需要的頻點(diǎn)位置。 2.The design approaches of TB-BPFs in 35 solved the above problem,but they suffered from the relatively large cir

8、cuit size.This letter presents a compact TB-BPF based on new SLSIRs with high impedance ratio. The central frequencies (CFs) and return losses (RLs) of three passbands can be independently controlled. Six transmission zeros (TZs) are realized to improve the filter performance. A TB-BPF operating at

9、0.9/1.8 GHz for GSM application, and 2.45 GHz for WLAN application is designed and fabricated to verify the validity of proposed design approach.中文： 文獻(xiàn)35中提出的設(shè)計(jì)方法很好的解決了上述問題，但是存在設(shè)計(jì)出的結(jié)構(gòu)尺寸過大的問題。本文提出了一個(gè)基于具有高阻抗比特性的新型枝節(jié)加載階躍阻抗諧振器。所實(shí)現(xiàn)的三個(gè)通帶的中心頻率還有回波損耗都具有獨(dú)立可控的特性。并且還獲得了六個(gè)傳輸零點(diǎn)，有效的改善了通帶的選擇性。最后設(shè)計(jì)并加工了一款中心頻率為0.9/1.8

10、 GHz可用于GSM通信和中心頻率 為2.45 GHz（用于無線通信）的三通帶濾波器，從而證明所提出的方法可行性。 II. Proposed SLSIRFig. 1(a) shows the transmission line model of proposed SLSIR. Zi (i = 1, 2, 3, 4) and j (j = 1, 2, 3, 4, t) represent impedance and electrical length, respectively. The input admittance seen from the loaded point can be der

11、ived as: Fig. 1(a) shows the transmission line model of proposed SLSIR. Zi (i = 1, 2, 3, 4) and j (j = 1, 2, 3, 4, t) represent impedance and electrical length, respectively. The input admittance seen from the loaded point can be derived as:中文：圖1給出了該諧振器的傳輸線模型。Zi (i = 1, 2, 3, 4) and j (j = 1, 2, 3,

12、4, t)分別表示阻抗和電長度，可以推導(dǎo)出從枝節(jié)加載點(diǎn)看進(jìn)去的導(dǎo)納公式如下： Within the interested frequency range, there are three resonant modes fp1, fp2 and fp3 which are determined by Y = 0. Moreover, three potential TZs TZVG1, TZVG2 and TZVG3 located at the upper sides of three resonant modes can be observed, mainly due to the virt

13、ual grounds existed in SLSIR (Y = ). Since the design parameters of SLSIR are prior to meet the required frequency positions of three resonant modes, the TZs due to Y = cannot be tuned freely.中文：在有研究興趣的頻帶內(nèi)，可以推導(dǎo)Y = 0來確定 fp1, fp2 和 fp3三個(gè)諧振頻率。同時(shí)，因?yàn)橹C振器的虛擬接地端，在三個(gè)模式的上邊帶部分出現(xiàn)了三個(gè)傳輸零點(diǎn)。因?yàn)樵跒V波器設(shè)計(jì)確定結(jié)構(gòu)參數(shù)的時(shí)候，通常優(yōu)先選擇

14、先確定所需的諧振頻點(diǎn)，所以零點(diǎn)不能實(shí)現(xiàn)獨(dú)立可控。 As shown in Fig. 2(a)(c), a larger value of K is benefit for controlling the corresponding resonant mode independently. Fig. 2(a)(c) also show that fp1, fp2 and fp3 can be independently controlled by 1, 3 and 4,respectively. In this design, K = 4.9 is selected and Z2 19 can

15、be calculated. As shown in Fig. 2(d), the different loadedpoint t also has minor effect on fp1, fp2,and fp3. In this design, the tapped point of feeding line is selected at the loaded point. 中文：從圖2的(a)(c)可以發(fā)現(xiàn)，K的值越大越有利于實(shí)現(xiàn)相應(yīng)頻率的獨(dú)立可控。根據(jù)圖2的(a)(c)還可以發(fā)現(xiàn)fp2 和 fp3可以分別通過改變1, 3 和 4得大小來實(shí)現(xiàn)單獨(dú)可控。在實(shí)際設(shè)計(jì)當(dāng)中，K的值選為1，從而可

16、以計(jì)算的Z2 19 。如圖2（d）所示加載位置t的不同對fp1, fp2和fp3有微小的影響。設(shè)計(jì)過程中，本文將饋線的抽頭位置選在枝節(jié)加載節(jié)點(diǎn)處。 A novel TB-BPF with independently controlled CFs(center frequencies) and inband RLs are presented by using proposed SLSIR. Six TZs generated by the cancelling effect of MEMC, virtual grounds existed in SLSIR and EOS improve th

17、e passband selectivity and band-to-band isolation significantly. The fabricated TB-BPF also exhibit a compact size and wide upper stopband. These merits make the newly proposed TB-BPF attractive in modern multi-service transceiver.IV. Conclusion中文：本文提出了枝節(jié)枝節(jié)加載的階躍阻抗諧振器，通過對該諧振器的使用設(shè)計(jì)了一個(gè)新型的具有中心頻率和回波損耗獨(dú)立可控的三通帶帶通濾波器。因?yàn)殡A躍阻抗枝節(jié)加載諧振器的接地部分和所加載枝節(jié)的開路部分，存在混合電磁耦合相位抵消，三個(gè)通帶附近產(chǎn)生了六個(gè)傳輸零點(diǎn)，顯著改善了通帶的選擇性和通帶之間的隔離度。加工出三通帶帶通濾波器結(jié)構(gòu)緊湊且經(jīng)過測試發(fā)現(xiàn)，有較寬的上頻帶阻帶效果。所提出的三通帶濾波器因?yàn)榈倪@些優(yōu)點(diǎn)，在現(xiàn)代通帶多頻帶收發(fā)機(jī)中 很有吸引力。