共查询到19条相似文献,搜索用时 46 毫秒
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微波电调带通滤波器的研究 总被引:4,自引:0,他引:4
介绍了几种典型的微波电调滤波电路设计方法。经研究设计并制作了一相对带宽小于2%的电调通滤波器。改进型谐振器设计使该电路具有温度性能好,制作简单、可靠性高等优点,并对该种电路进行了全波分析。 相似文献
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本文叙述采用梳状线结构的变容管电调微波带通滤波器的设计理论和方法。推导出梳状线带通滤波器的输入、输出耦合网络的参数条件,以补偿带通滤波器的谐振器之间电磁耦合随不同调谐频率的变化;并给出使带通滤波器的绝对带宽或通带回波损耗在调谐频率范围内变化最小时,梳状线谐振器的电长度应满足的相应条件,由此来保证电调带通滤波器在较宽的调谐频率范围内具有较高的通带回波损耗,且保持带通滤波器的响应形状和绝对带宽基本不变。此外,还讨论了由电调变容管的Q值引起的带通滤波器的通带有功损耗问题。文中给出了具体的设计公式。最后,给出了一个L波段变容管电调带通滤波器的研制实例和测试结果。 相似文献
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变容管调谐微带环形谐振器带通滤波器的研究 总被引:1,自引:0,他引:1
本文研究了变容管调谐的微带环形谐振器带通滤波器。给出了微带环形谐振器的谐振特性和两环形谐振器间的耦合特性。制作了二级变容管调谐微带环形谐振器的带通滤波器,实验结果和理论吻合较好。 相似文献
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文章提出了一种基于终端加载变容管的混合型梳状线谐振器的三阶电调微带带通滤波器,仅采用两个电压源进行控制.根据奇偶模分析方法,推导了混合梳状线谐振器间耦合系数计算公式,通过合理设计级间及输入输出耦合结构,绝对带宽保持恒定的要求可以得到满足.设计了一个调谐范围为1.0GHz~1.78GHz ,3dB绝对带宽为104.5±8MHz的三阶电调滤波器,其插入损耗小于5.7dB ,回波损耗优于16dB ,对二次谐波的抑制达到60dB .实验结果表明,测试结果与电磁仿真结果基本一致. 相似文献
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给出了一种中心频率为1.675GHz园杆梳状线微波带通滤波器的设计过程.设计方法采用等效电路原理,并用HFSS软件仿真优化.所设计滤波器采用园杆梳状线结构,其结构紧凑,体积小,便于加工.文中将实测曲线和仿真曲线进行了比较,二者吻合很好. 相似文献
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微波梳状线带通滤波器脉冲功能容量的研究 总被引:1,自引:0,他引:1
在脉冲相位刍控(PPK)再入遥测系统中,除了传输常规遥测信号外,还要传输特种遥测信号,即单次宽脉冲信号。文中介绍了能满足该系统要求的端接在发射设备后的微波梳状线带通滤波器有关技术、原理、结构特征和设计方法,以及提高单次宽脉冲功率信号传输能力的技术措施和实验研究结果。 相似文献
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Young-Ho Cho Hyung-Il Baek Haeng-Seon Lee Sang-Won Yun 《Microwave and Wireless Components Letters, IEEE》2009,19(10):626-628
This letter presents a dual-band combline bandpass filter (BPF) loaded by lumped series resonators. The proposed filter configuration can easily generate two desired passbands by controlling the resonant frequencies of the comblines as well as the series resonators. Furthermore, the skirt frequency characteristics between the two passbands are improved by transmission zeros introduced by source-load coupling via a lumped element capacitor. Two-pole dual-BPF with center frequencies of 1.2 and 1.54 GHz is designed and the measured results agree well with simulated results. 相似文献
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《Microwave Theory and Techniques》1971,19(4):373-380
A technique is described for synthesis of coaxial bandpass filters based on an improved design of impedance inverters. This technique is applicable to filters having bandwidths between approximately 1 percent and 20 percent of the center frequency. The inverter used to realize the filters is a section of either low-Z/sub 0/ line or high-Z/sub 0/ line and is synthesized as a distributed element rather than as a lumped shunt capacitance or lumped series inductance, respectively. Three methods of accommodating the discontinuity capacitance associated with an abrupt change in the characteristic impedance are reviewed. The first two methods are most useful for filters with a fractional bandwidth/spl gsim/ 10 percent and the third for a fractional bandwidths /spl lsim/10 percent. Numerical and experimental verification of the design procedure is provided. 相似文献
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Yi-Ming Chen Sheng-Fuh Chang Chia-Chan Chang Tin-Jae Hung 《Microwave Theory and Techniques》2007,55(10):2191-2199
An enhanced stepped-impedance combline bandpass filter employs an array of stepped-impedance resonators with tapped-transformer coupling at input and output is presented in this study. This filter has enhanced performance, including symmetric insertion-loss response around the passband and wider stopband range. The structure is compact and suitable for multilayer realization because it is free of lumped capacitors and has fewer via-hole grounds. The circuit is investigated with the characteristic mode theory of coupled lines to prove the existence of multiple transmission zeros around the passband. Numerous diagrams are given for circuit design purposes. The second- and fourth-order bandpass filters at 2.45 GHz were designed, measured, and compared with the conventional combline structure to demonstrate their performance enhancement. 相似文献
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《固体电子学研究与进展》2017,(1)
介绍了一种基于LTCC工艺的梳状线带通滤波器的设计方法,滤波器包含四个谐振单元,每个谐振单元采用多层交叠带线结构。利用电磁仿真软件HFSS提取输入输出谐振单元的外部Q值以及谐振单元间的耦合系数,通过在第一级与第四级谐振单元之间引入Z型容性耦合,在上下边带各插入一个传输零点,提高带外抑制能力。实测结果显示,滤波器在中心频率3.35GHz处的插入损耗小于3dB,-1dB带宽大于400 MHz,带外抑制在DC-2.5GHz内大于40dB,在4~8GHz内大于30dB。 相似文献
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微带发夹型带通滤波器以其尺寸小,性能稳定等优点在射频微波领域得到了广泛应用和发展。依据微带发夹型带通滤波器的构成原理及其数学建模,结合ADS的优化仿真功能详细地论述了一个微带发夹型带通滤波器实例的设计过程,并得出了满足设计目标的版图仿真结果,论证了设计理论的正确性,证明了此设计方法适合于工程应用。 相似文献
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Hairpin滤波器在无线通信和卫星通信中应用广泛,基于此根据Hairpin滤波器微带设计的基本理论出发,设计了一款X波段的宽带带通滤波器,中心频率为9 GHz,带宽为2 GHz,插入损耗和带外抑制都达到了指标要求,并且通过ADS和HFSS两个软件的电磁仿真进行了对比和相互验证。 相似文献