共查询到18条相似文献,搜索用时 140 毫秒
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提出了一种新型微带发夹型滤波器,通过在传统发夹滤波器结构之后采用短路短截线与高次谐波四分之一波长开路短截线并联谐振的方法,可在不影响中频信号的前提下,对高次谐波进行有效抑制.同时在开短路支节之间串联一段微带径向短截线,能实现对谐波的宽带抑制.仿真结果表明此滤波器结构紧凑,具有良好的级联特性,在结构和性能上具有较大优势,适用于多种微波通信系统. 相似文献
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采用阶跃阻抗谐振理论,改进了一种三角环阶跃阻抗谐振器,并利用奇偶模分析法详细分析了三角环阶跃阻抗谐振器的谐振特性,将三角环阶跃阻抗谐振器与平行交叉耦合线相耦合,实现了紧凑型超宽带带通滤波器。随后引入产生三陷波特性的E型和C型谐振单元,将三个陷波频率调整到3.5,5.2,8 GHz频点上,实现三陷波特性的超宽带带通滤波器,有效地抑制超宽带内WiMAX、无线局域网和X卫星等频段的干扰。最后将三陷波滤波器结构进行HFSS仿真和实物加工测试,带内外特性良好,且实物测试与仿真结果一致,在特定的通信领域具有一定的应用价值。 相似文献
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微带发夹型带通滤波器具有尺寸小、结构简单、性能稳定等优点,在射频微波领域有着广泛的应用。
本文使用ADS 软件设计仿真了一种高选择性抽头式发夹型带通滤波器。与一般发夹型滤波器相比,该滤波器在输
入输出端并联四分之一波长开路微带线,通过在寄生通带增加传输零点的方法提高滤波器的带外抑制性能。另外,
在该滤波器的谐振单元上增加并联阶跃阻抗枝节,在通带两侧产生一对传输零点,来提高该发夹型带通滤波器的选
择性。最后对这种高选择性发夹型带通滤波器进行实物加工,测试结果证实了该带通滤波器的良好选择性能。 相似文献
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基于传统阶跃阻抗滤波器,提出了一种易于实现的超宽阻带微带低通滤波器改进设计方案。低阻抗线部分采用扇形微带结构,在同等阶数下,该结构的滤波器与传统阶跃阻抗滤波器相比,具有更紧凑的电路结构以及更好的阻带特性。在滤波器末端并联开路短截线,使得阻带增加额外传输陷波点来抑制寄生通带。利用ADS和HFSS仿真软件对滤波器结构进行优化设计,并进行了实物的加工和测试。实测结果表明,通带3 dB 截止频率为2 GHz,通带内0-1.8 GHz 回波损耗大于20 dB,3-20 GHz 频率范围内的阻带抑制能达到25 dB 以上。 相似文献
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提出一种基于阶梯阻抗发夹谐振器的小型化微波低通滤波嚣,该滤波嚣仅由包含四节微带的阶梯阻抗发夹谐振器构成.设计结果表明,滤波器3dB通带从直流到2.8G,带内反射小于-20dB,带外抑制达到40dB.这种滤波器尺寸小,易制造,且具有陡峭的截止频率响应特性,可用于许多微波系统中. 相似文献
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利用阶跃阻抗槽线多模谐振器和微带线与槽线的信号转换,设计了一款具有陷波功能的超宽带带通滤波器。滤波器在一块介质基板上制作而成,基板接地面上有一条终端短路宽度不均匀(阶跃阻抗)槽线谐振器,基板的另一面有两条与槽线谐振器垂直的“L”形的开路微带线,作为滤波器的信号输入和输出端口,在这两端口的附近各刻有一条“U”形的槽线,以实现滤波器的陷波功能。仿真和实测表明了滤波器的工作带宽可达3.2GHz-11.4GHz,其中陷波带宽为5.2GHz-5.75GHz。 相似文献
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蔡钟斌 《太赫兹科学与电子信息学报》2007,5(1):78-80
提出一种基于阶梯阻抗发夹谐振器的小型化微波低通滤波器,该滤波器仅由包含一节微带线的阶梯阻抗发夹谐振器构成。设计结果表明,滤波器3dB通带从DC(Direct Current)到2GHz,回波损耗优于10dB,且插入损耗从DC到1.7GHz时优于0.5dB,带外抑制从2.9~4GHz优于20dB。仿真结果和实验结果吻合良好。这种滤波器尺寸小,易制造,且具有陡峭的截止频率响应特性,可应用于许多微波系统中。 相似文献
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Srisathit S. Patisang S. Phromloungsri R. Bunnjaweht S. Kosulvit S. Chongcheawchamnan M. 《Microwave and Wireless Components Letters, IEEE》2005,15(2):101-103
Since conventional microstrip hairpin filter and diplexer are inherently formed by coupled-line resonators, spurious response and poor isolation performance are unavoidable. This letter presents a simple technique that is suitable for an inhomogeneous structure such as microstrip to cure such poor performances. The technique is based on the stepped impedance coupled-line resonator and is verified by the experimental results of the designed 0.9GHz/1.8GHz microstrip hairpin diplexer. 相似文献
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Haiwen Liu Jiuhuai Lei Yulong Zhao Wenyuan Xu Yichao Fan Tiantian Wu 《ETRI Journal》2013,35(2):344-347
This letter presents a compact dual‐mode tri‐band bandpass filter by using a short‐circuited stub‐loaded stepped‐impedance resonator (SIR) and a short‐circuited stub‐loaded uniform impedance resonator. Also, a hairpin SIR geometry is introduced to miniature the size of this filter while maintaining excellent performance. The use of a short‐circuited stub at the central point of the hairpin SIR can generate two resonant modes in two passbands. Its equivalent circuit structure is analyzed by using the even‐odd mode theory. For demonstration purposes, a tri‐band filter for the applications of the Global Positioning System at 1.57 GHz, Worldwide Interoperability for Microwave Access at 3.5 GHz, and wireless local area networks at 5.2 GHz is designed, fabricated, and measured. 相似文献
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Compact lowpass filter using stepped impedance hairpin resonator 总被引:1,自引:0,他引:1
Lung-Hwa Hsieh Kai Chang 《Electronics letters》2001,37(14):899-900
A novel microwave lowpass filter using a microstrip stepped impedance hairpin resonator is proposed. This filter has the advantages of compact size, easy fabrication, and sharp cutoff frequency response. The filter is useful for many microwave system applications 相似文献
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Design of compact, broad-stopband lowpass filter using modified stepped impedance hairpin resonators
A compact elliptic function lowpass filter using a stepped impedance hairpin resonator is proposed. The filter has the advantages of compact size, low insertion loss, easy fabrication, a wide stopband, and sharp cutoff frequency response. In order to cause a sharp cutoff frequency response and the wide stopband suppression, a coupled stepped impedance resonator is taken into consideration for the newly proposed lowpass filter. A demonstration filter has been designed, fabricated and tested, and the results agree well with the theory. The size of the filter is less than 0.037 lambdag times 0.093 lambdag, where lambdag is the waveguide length at the cutoff frequency 1.5 GHz, and the 10 dB rejection stopband can be extended to more than 15 GHz. The filter is useful for many microwave system applications. 相似文献
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Bian Wu Chang-hong Liang Pei-yuan Qin Qi Li 《Microwave and Wireless Components Letters, IEEE》2008,18(10):674-676
This letter presents a novel approach for designing a dual-band bandpass filter by using defected stepped impedance resonator (DSIR). The resonant frequency of the DSIR is found to be much lower than that of the conventional microstrip stepped impedance resonator (SIR), which reduces the circuit size effectively. Two types of second-order DSIR microstrip bandpass filter operating at 1.85 and 2.35 GHz, respectively, are well designed according to the classical theory of coupled resonator filter. Then they are combined to construct a compact dual-band filter with a common parallel microstrip feed line, the measurement results of the fabricated filter have a good agreement with the simulation. 相似文献
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A novel hairpin resonator incorporating a defective uniplanar compact photonic bandgap (D-UCPBG) slow-wave structure has been developed using monolithic silicon-based CMOS technology and the impact of the D-UCPBG slow wave feature on the hairpin resonator performance is presented. Two stepped impedance hairpin resonators of equal dimensions, one with a solid ground plane and another with a D-UCPBG structure, were implemented in the TSMC 0.25 /spl mu/m RF-mixed signal fabrication process. The D-UCPBG incorporated hairpin resonator resonates at 4.5 GHz, a significant frequency reduction from 10.2 GHz, the resonant frequency of the solid ground plane based hairpin resonator. The loaded Q of the resonator also increases from 5.8 for the solid ground plane resonator to 13 for the D-UCPBG structure. 相似文献