共查询到19条相似文献,搜索用时 187 毫秒
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本文讨论了用双模介质加载谐振腔实现的微波线性相位滤波器结构,在非级联耦合的诸振腔之间引入一个交叉耦合,以改善通带内的时延平坦特性,给出了用模匹配法计算介质加载谐振腔的谐振频率和谐振腔之间耦合系数的方法。介绍了采用这种方法构成的滤波器的实际设计方法。最后制作了用这种方法设计出的滤波器,给出的实测结果表明它不仅可满足幅频特性的滤波要求,而且具有良好的通带时延特性。 相似文献
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论述了TE01模介质谐振腔滤波器的设计方法。主要分析了介质谐振腔的设计、谐振腔之间的耦合,包括电耦合与磁耦合的实现。为了使TE01模滤波器与其它高Q值的滤波器具有可比性,采用交叉耦合来实现高性能滤波特性。仿真设计了一个6阶准椭圆函数滤波器,4个传输零点对称的分布在通带两侧,实现了较好的带外抑制。最后设计了一个同轴腔与介质谐振器混合耦合的滤波器,用来抑制介质滤波器寄生通带的影响。 相似文献
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基于同轴腔滤波器的基本理论,运用综合设计方法计算出一种中心频率为2.160 GHz、带宽为20 MHz的用于3G移动通信的七同轴腔滤波器腔体的结构尺寸,并计算出腔间的耦合系数;再应用微波三维电磁仿真软件HFSS仿真得出的腔间耦合系数和耦合孔大小的关系曲线,得到了耦合孔半径尺寸;调试实测结果符合设计预期,并说明了实际调试时的注意因素 相似文献
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本文研究了适合于低频段宽带多注速调管的新型微波谐振腔半波长矩形同轴腔,用三维电磁场计算软件ISFEL3D计算了矩形同轴腔的高频参数和场分布,并与双间隙耦合圆柱腔进行了分析比较。结果表明,矩形同轴腔体积小,带宽潜力大,可应用于低频段多注速调管。 相似文献
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针对三维全波仿真提取微波谐振腔耦合系数耗时长和提取结果不易被收敛的问题,提出了一种基于等效电路Y参数的耦合系数提取方法,并将该方法应用到改进的渐进空间映射算法的参数提取过程中,提高了滤波器的设计效率。通过一个4腔同轴腔体滤波器的设计实例进行了验证,滤波器的电磁仿真结果与理论综合结果吻合良好,证实了该方法的有效性。 相似文献
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耦合系数法设计微波带通滤波器及CAD实现 总被引:6,自引:2,他引:4
介绍了一种直接耦合微波带通滤波器的设计方法,同时给出了一个滤波器的设计实例和测试结果。运用网络综合法,根据所需技术指标,计算出腔间耦合系数和外界Q值的理论值。采用CAD方法进行了仿真,得到了相应的实际的谐振腔的耦合结构,然后进行整体仿真优化,完成整个设计。具有通用性强,设计准确,减小研制周期等优点。 相似文献
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A method for realization of dual-mode coupling in rectangular waveguide cavities is described and analyzed. The method completely replaces the coupling screw, and therefore can be used to eliminate the need for tuning in dual-mode waveguide cavity filters. It also offers a wide range of coupling values and can achieve higher power-handling capability than coupling screws. Mode matching is used to calculate the mode chart of the infinitely long square corner cut rectangular waveguide (SCCRW), the field distributions of each mode, and the resonant frequencies of the cavity. An evanescent mode rectangular waveguide is used to provide dual-mode couplings between adjacent cavities. The junction discontinuity between the SCCRW and the rectangular waveguide is modeled by a double mode-matching method, yielding modal scattering parameters of the junction. A four-pole dual-mode elliptic-function rectangular waveguide cavity filter using the coupling method was constructed. The experimental filter results showed excellent agreement with theory 相似文献
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研究了由一个Λ型三能级原子、一个V型三能级原子和光纤连接的双模腔构成的系统,给出了初始激发数为1时系统态矢的演化。通过对原子1、原子2、腔A、腔B和光纤模被激发的几率的计算,研究了系统的动力学行为。讨论了光纤模与腔场间的耦合强度变化对系统的动力学行为的影响。研究结果表明:随光纤模与腔场间的耦合强度增强,原子、腔A和腔B被激发的几率随时间演化的周期性增强,但腔A和腔B被激发的几率减小。另一方面,光纤模被激发的几率随光纤模与腔场间的耦合强度变化存在非线性关系。 相似文献
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The mode matching method is used to accurately model a generalized cylindrical dielectric resonator structure in a rectangular waveguide or cavity. The field distributions of different modes in cavities are given. The resonant frequencies of the cavities are calculated and compared to the measured data, showing very good agreement. The resonator structure can be a dielectric disk resonator, a ring resonator, a dielectric resonator with support, etc. This structure can be used in filter design as the basic element, providing very good mechanical stability. The slot coupling between cavities is also analyzed, showing some interesting results 相似文献
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该文基于频率变换的方法设计了两种结构的双通带的腔体滤波器,一种是通过谐振器之间直接耦合实现的;另一种是在谐振器之间引入交叉耦合实现的,从而达到产生传输零点的目的。首先根据设计指标,采用频率变换的方法,计算得到谐振器间的耦合系数和外部Q值,然后利用Ansoft HFSS建立同轴腔体滤波器的模型并进行仿真,仿真结果与ADS中等效电路得到的理论结果基本吻合,从而验证了这种方法的正确性。最后通过对级联型结构与交叉耦合型结构双通带腔体滤波器的比较,得出后者比前者具有更好的带外抑制特性。 相似文献
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The step junction between a circular and an eccentric coaxial waveguide is analysed using a rigorous mode matching technique along with the Graff's addition theorem for cylindrical functions. The necessary expressions including the coupling integrals are considered analytically. Based on this analysis the off-centred coaxial iris in a circular waveguide is studied. Its properties are pointed out and the single and dual irises on the same diaphragm features are exploited for the design of bandpass filters. 相似文献
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研究原子与耦合腔相互作用系统,考虑每个腔囚禁一个二能级原子,并且原子通过双光子跃迁与腔场发生共振相互作用,通过解薛定谔方程导出了系统态矢的演化规律;利用负本征值度量两个子系统间的纠缠,研究两原子间和原子与腔场间的纠缠演化,讨论了两腔场间耦合系数变化对纠缠的影响。研究结果表明:随腔场间耦合系数增大,原子间的纠缠和原子与腔场间纠缠均表现出从不规则振荡向准周期性演化的转变,当腔场间耦合系数大于一定值后它们均呈现出准周期性演化规律;而曲线平均值呈现时而增大时而减小的过程,表明它们与腔场耦合系数间存在非线性关系;另一方面,当腔场间耦合系数较小时,原子与腔场间纠缠还呈现出崩塌和恢复现象。 相似文献
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《Microwave Theory and Techniques》1964,12(1):132-138
Mathematical analyses of multisection coaxial cavities predict the possibility of shifting one of the spurious resonant frequencies (present in all coaxial cavities) to a desired frequency, thus allowing one cavity to do the work of two. The specific problem considered in this paper is the design of cavities to resonate a terminating capacitance (e.g., tube capacitance, "varactor" capacitance) at two harmonically-related frequencies, with the additional requirement that the two frequencies remain very nearly in the desired ratio despite wide variations in the magnitude of the terminating capacitance. (As one obvious application, a cavity meeting these requirements would make possible an inherently-aligned single-cavity frequency multiplier.) Curves based on computed results for specific cases are presented. Experimental cavities constructed according to the predicted designs have exhibited performance which is in very close agreement with the analysis, thus verifying both the validity of the method of analysis and the feasibility of the desired result. Application of the same techniques to other and more general problems (e.g., single-cavity mixers, voltage-tunable filters) are suggested. 相似文献
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提出了一种过模基片集成波导(SIW)腔体滤波器。介绍了只由单个过模SIW 腔体构成的一阶滤波
器的原理。利用过模SIW 腔体中的基模实现模式交叉耦合,滤波器能产生一个位于通带任一边的传输零点(TZ)。
设计了一个由两个过模SIW 腔体级联成的二阶滤波器,该滤波器能产生两个传输零点。为了改善滤波器的阻带性
能,使用了非相似谐振器技术来实现寄生抑制。此外,阻带性能也可以通过增加基模谐振器的数量来改善。设计并
制造了含有两个过模SIW 腔体的二阶和三阶滤波器,仿真与测试结果吻合。 相似文献