小型化多层带线谐振腔缺陷地结构LTCC宽带带通滤波器

利用多层宽边耦合带状线谐振结构实现小型化LTCC(LowTemperature Co-fired Ceramic)宽带滤波器。采用了两层、三层耦合带线谐振结构,利用这两种谐振结构可以有效减小滤波器的尺寸。利用四个谐振腔结构,实现较宽的频带和较强的选择特性;输出、输入引入电感反馈产生两个传输零点,利用DGS(Defected Ground Struc-ture)可使滤波器在阻带和镜像频率处产生较大的衰减。设计出侧面印刷互连和侧面通孔互连两种工艺结构的滤波器,利用LTCC工艺加工出侧面印刷互连的滤波器性能良好,测试性能和仿真结果基本吻合。     

纳机械谐振器的非线性特性分析

纳机械谐振器有几百兆甚至更高的工作频率,本文利用达芬方程作为纳机械谐振器的动力学方程,用数值方法求解了电磁驱动纳机械谐振器的动态特性,计算表明谐振器有明显的非线性特性,与国外已有的实验结果相符合,该分析方法可以为纳机械混频器设计提供参考。     

Synthesis of Elliptic Optical Filters Using Mutually Coupled Microring Resonators

Integrated optical filters having elliptic transfer functions are proposed using two-dimensional arrays of synchronously tuned mutually coupled microring resonators. Analysis of microring filter topologies of the most general form is facilitated by the formulation of an energy-coupling matrix for the microring array. A method for synthesizing elliptic microring filter transfer functions having the prescribed transmission poles and zeros is also presented. The approach involves representing the microring filter by an equivalent electrical network of coupled LC oscillators and applying the coupling matrix technique developed for micro-wave filters to determine the coupling parameters. An example of a sixth-order elliptic function filter is presented to demonstrate the feasibility of using mutually coupled microring resonators to realize optical filters having finite transmission zeros in the transfer function     

Switched-capacitor high-Q bandpass filters for IF applications

Experimental results for a sixth-order switched-capacitor bandpass filter with a selectivity Q of 55 at a center frequency of 3.1 MHz are presented. A simple noise analysis of active bandpass filters composed of coupled identical resonators is introduced to explain the dynamic range reduction in high-Q active filters resulting from loose high-Q couplings between resonators. Theoretical predictions of noise in coupled resonator-type bandpass filters agree well with measured results. The prototype chip occupies 2 mm/SUP 2/ and dissipates 45 mW with a single 5-V supply.     

A Compact Open-Loop Filter With Mixed Electric and Magnetic Coupling

A novel cascaded microstrip open-loop resonator filter with controllable electric and magnetic mixed coupling is presented to have one or more transmission zeros. For two coupled resonators, the coupled sides with the maximum magnetic field are combined with their open gaps with the maximum electric field, creating the electric and magnetic mixed coupling. By adjusting the distances between resonators and the positions of open gaps in a mixed coupled filter, the coupling coefficients can be changed, and controllable transmission zeros can be produced in the lower stopband, upper stopband, or both. Design and fabrication of the proposed second-and fourth-order filters show the advantages: such as a smaller number of resonators, higher rejection level, as well as asymmetrical response; moreover, the location of the transmission zeros can be precisely controlled.     

Compact Millimeter-wave filters using distributed capacitively loaded CPW resonators

In this paper, a method for reducing the size of coplanar-waveguide (CPW) resonators, used in the design of compact bandpass filters, is presented. This is accomplished by incorporating a distributed array of capacitive loads along a resonant CPW line. Design of a miniaturized bandpass filter using capacitively loaded CPW resonators, which are inductively coupled, is presented. Inductively coupled bandpass filters with the proposed capacitively loaded CPW line resonators are designed and a size reduction of 25%, compared with filters using a standard CPW line resonator, is demonstrated. It is shown that, through this size reduction, the insertion loss is minimally increased (<0.4 dB). A hybrid algorithm, combining the method of moments (MOM) and circuit simulation is used to facilitate design process. Few filters using this technique are designed, fabricated, and measured at W-band. An excellent agreement between the simulation and measurement responses of these filters is presented.     

Bandpass characteristics of coupled resonators

A system of series-coupled transmission cavity resonators formed from sections of regular waveguides separated by coupling windows is considered. Bandpass characteristics of this system are obtained by representing the fields in the cavities in the form of a sum of the waves scattered by the windows. A method for measuring the intercavity coupling coefficient for two coupled resonators is presented and a good agreement between the calculated and measured characteristics is demonstrated.     

压电陶瓷圆筒振子耦合振动的本征频率分析

研究了压电陶瓷圆筒振子的耦合振动,分析了振子的轴向、径向伸缩振动及扭转振动之间的耦合关系.从理论上推导出了振子耦合振动的共振频率方程.由于分析中对振子的几何尺寸未加任何限制.因此所得结论适用于任何尺寸的陶瓷圆筒振子,其中包括厚壁圆筒及圆环.理论分析表明.本研究计算简单,物理意义明显,与一维理论的结果相比,文中得出的振子耦合振动的共振频率与实测值符合较好.     

Coupled-resonator acoustic-surface-wave filter

A 2-port filter using piezoelectrically coupled acoustic-surface-wave resonators is described. A lumped-element equivalent circuit is proposed, with expressions for element values. Theoretical insertion-loss/frequency characteristics of some 2-resonator filters are presented.     

Differential measurement technique for evaluating microstrip line attenuation

A differential measurement technique employing straight line end coupled microstrip resonators is presented. The technique allows separate measurement of microstrip attenuation constant and end loss contributions, and works well up to Ku-band and above.     

Modified method for the analysis and design of microwave bandpass filters containing dielectric resonators

High-Q dielectric resonators having remarkable advantages such as compactness, light weight, temperature stability, and low cost have become very valuable elements for various microwave circuits. A modified Itoh and Rudokas model is proposed to analyse the field distribution and the coupling relations between dielectric resonators and microstrip lines based on the analysis results, a convenient procedure for designing microwave filters containing parallel coupled dielectric resonators is presented. Two experimental dielectric resonator filters are also fabricated to verify the calculation and the design procedure. The outcome demonstrates that the procedure provides good accuracy and saves design time.     

Optical bistability and differential amplification in nonlinearfiber resonators

Optical bistability and differential amplification, arising as a consequence of the nonlinear Kerr effect in fiber resonators, are considered in the present paper. A structure-independent transfer matrix method devised for linear operation is extended to account for nonlinear self-phase effects. General expressions are presented and applied to particular cases showing complete agreement with previously published results     

低插损同轴型微波介质滤波器的设计

1/4波长同轴谐振器构成的微波介质带通滤波器,具有三个谐振孔、二个耦合孔,谐振器间通过耦合孔相互耦合,材料采用高介电常数微波陶瓷,器件表面涂覆金属电极。讨论了耦合孔半径对滤波器技术指标(中心频率f_0、3dB带宽B、插入损耗L_0、阻带抑制L_A等)的影响,然后根据给定的滤波器技术指标确定了滤波器的类型、结构、级数及尺寸,最后进行了仿真验证,得到了低损耗的带通滤波器。     

异构耦合谐振器耦合系数的提取

为寻找异构耦合谐振器耦合系数提取电路的设计原则,本文将提取同构耦合谐振器耦合系数的电路模型一般化,在电路仿真软件中分析其各项参数变化对特征频率的影响方式,从中总结异构耦合谐振器耦合系数提取电路的设计原则与注意要点。设计了一对特定异构耦合谐振器耦合系数的提取电路,通过其提取的耦合系数在一个双频带带通滤波器设计中发挥了重要...     

Controlling the Bandwidth of Split Ring Resonators

A method to control the half-power relative band- widths of split ring resonators (SRRs) coupled to a transmission-line system is presented. An equivalent circuit model is proposed to analyze the main factors that effect the relative band- widths of SRRs. Based on the analysis, we propose an efficient way to control the relative bandwidth of SRR, which has been verified by both full-wave simulations and experiments. The proposed analysis can be used to design novel resonators and other microwave components.     

New direct coupling configuration between TE/sub 01 delta / dielectric resonator modes

A new geometric configuration is presented to carry out negative coupling between dielectric resonators (DRs) acting in their dipolar TE/sub 01 delta / mode. These DRs are coupled in a direct manner so that transmission lines, metallic screws or irises as usually used become unnecessary.<>     

Recovery of linear harmonic oscillation from nonlinear regime in nano-resonators

A method of controlling the nonlinearity of nano-resonators without additional complicated systems is presented. With increasing electrothermal power, the critical amplitude up to which the resonators display linear harmonic oscillation increases. Using this technique, the resonator driven into the nonlinear regime can be recovered back into the linear range.     

Comparison of a class of millimeter-band slow-wave structures with a traditional chain of coupled resonators

Results of the analysis of a class of folded-waveguide slow-wave structures (a classical folded waveguide and coupled rectangular resonators) and resonator slow-wave structures (a comb-square, a ring on opposing metal mounts, and a traditional chain of coupled resonators) of the millimeter band are presented. Results on the comparative analysis of the characteristics of studied structures from the viewpoint of application of such structures, depending on their functional area, in O-type traveling-wave tubes of the short-wave band are given.     

Inverse eigenvalue sensing with corner coupled square plate MEMS resonators array

Monitoring the collective behaviour of coupled micro/nano resonators array provides a distinct opportunity for high resolution multi-function sensing. We report an inverse eigenvalue analysis based sensing approach for large array of coupled micro/nano resonators. A new characterization algorithm is proposed to precisely extract the system matrix of those multiplexed sensors with reduced algorithmic complexity and below 1% relative error. The method has been verified experimentally using five corner coupled square plate MEMS resonators with a natural frequency close to 0.85 MHz. The method is also capable of characterizing the fabrication process and important sensor parameters such as the spring constant and coupling ratio.     

An original approach to the design of bandpass cavity filters withmultiple couplings

A novel approach to the design of general cavity filters with each cavity coupled to an arbitrary number of other cavities is presented. This approach is based on a suitable characterization of the filter structure which does not require one to model separately the cavities (resonators) and the coupling elements. Suitably defined equivalent admittances are associated with each cavity allowing one to design the filter structure once the parameters of a suitable low-pass prototype are given; an efficient procedure for the synthesis of such a prototype with equiripple passband response is also presented which allows one to arbitrarily prescribe transmission zeros placed in the complex plane (even asymmetrically). The described design approach is particularly convenient when the filter structure does not allow a simple modeling of the resonators and coupling elements separately. This is the case of slot-coupled cavity filters and of filter structures based on arrays of coupled transmission lines. It is also shown that the simplified design approach often adopted in the past, where only two coupled cavities at a time are considered, can produce large errors even in the case of filters with all attenuation poles at infinity (i.e., two couplings per cavity)