共查询到20条相似文献,搜索用时 31 毫秒
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Alekseev S. G. Luzanov V. A. Polzikova N. I. 《Journal of Communications Technology and Electronics》2020,65(11):1339-1344
Using broadband acoustic resonator spectroscopy, an almost twofold increase in the frequency of optimal excitation of the composite microwave resonator of shear bulk acoustic waves is found when the distance from the substrate to the magnetron axis during the deposition of a ZnO film by magnetron sputtering is changed. The frequency characteristics of the resonator structure are simulated and an explanation of the change in the optimal excitation frequency by the inhomogeneity of the inclination of the ZnO film texture’s axis over the thickness is proposed.
相似文献2.
Yu. K. Fetisov V. L. Preobrazhenskii P. Pernod 《Journal of Communications Technology and Electronics》2006,51(2):218-230
The characteristics of a nonlinear magnetoacoustic resonator are studied. The resonator is fabricated from an antiferromagnetic hematite (α-Fe2O3) monocrystal. The amplitude-and phase-bistability loops are investigated experimentally when an exciting signal has a cyclically variable frequency and a fixed power or a cyclically variable power and a fixed frequency. Bistability is induced by strong coupling between the acoustic and magnetic subsystems of hematite. This coupling results in renormalization of both linear and nonlinear elastic moduli of the crystal and causes the resonator frequency to depend on the external magnetic field and the power level of the exciting signal. At low power levels, the resonator’s transmission characteristic is a Lorentzian curve and the frequency can be tuned over an interval of 65% of the initial value as the field ranges from 0 to 3 kOe. An increase in the signal power results in a distortion of the characteristic and in the frequency shift of the maximum transmission factor by 2.1%. Analytical expressions for the amplitude and phase bistable characteristics of a nonlinear magnetoacoustic resonator are obtained. Calculated and measured data are in quantitative agreement. 相似文献
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文中提出了一种基于折叠型SIR 谐振器的双通带频率可控的微带滤波器,它由SIR 谐振器特性结合
传输线理论实现。该滤波器设计为具有两个自由度,调节谐振器的导带宽度可以对两个通带之间的频率及其间隔
进行调节。文中还研究了调整谐振器导带长度对滤波器频率特性的影响。测试结果表明,该微带滤波器有两个通
带,其中心频率分别为2. 79 GHz 和3. 90 GHz,带内最小插入损耗分别为-0. 96 dB 和-3. 0 dB,带内最小回波损耗分
别为-42 dB 和-18 dB,相对带宽分别为5. 7%和6. 7%。仿真和测试结果的一致性证实了滤波器设计的有效性。 相似文献
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The purpose of the present paper is to establish a method of design for a multicoupled loop-gap resonator used for pulsed electron paramagnetic resonance measurements. For the design of resonator characteristics, the method has an advantage of a systematic approach without iterative calculations. In this design, the number of loop-gap resonators used is first determined from the pass band required as the specifications of the resonator. To satisfy the specifications, electrical parameters of an equivalent circuit and the dimensions of the resonator are estimated. By the proposed method, a prototype resonator which has the operation frequency of 1.3 GHz is designed and fabricated. For the prototype resonator, the characteristics of the return loss agree with the required ones. As a result, the validity of the design method is experimentally confirmed 相似文献
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Alexander V. Arkhipov Oleg I. Belous Boris M. Bulgakov Anatoly I. Fisun Oleg E. Marykivskiy 《Journal of Infrared, Millimeter and Terahertz Waves》2003,24(7):1133-1147
An open resonator with its constituent the barrel-shaped reflected surface is described. Millimeter wave-band oscillator and amplifier based on this resonator investigated. The power and frequency characteristics are presented. It is shown that this device can best be used as a regenerative amplifier. 相似文献
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《Microwave Theory and Techniques》1977,25(9):719-725
A new technique for calculating the radiation losses of microstrip configurations is presented. The method applies if the wavelength is large compared to the width of the conducting strip and the thickness of the dielectric wafer. It is shown that the radiated power, which is partly carried by "space waves" and partly by "surface waves," can be computed in terms of the specific inductance and the specific capacitance of the transmission line, without making any assumptions regarding the current distribution in the microstrip. It appears that the fraction of the radiated power carried by surface waves contains the frequency to a higher power than does the fraction carried by space waves and is therefore relatively small. The investigated configurations are the infinitely long transmission line excited by a voltage-slit, the half-wavelength straight resonator, the full-wavelength circular resonator, and the quarter-wavelength hair-pin resonator. It follows that the quality factor of the straight resonator and the circular resonator are inversely proportional to the square of the frequency, whereas the quality factor of the hairpin resonator is inversely proportional to the fourth power of the frequency. 相似文献
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Ching-Chuan Su Jenn-Ming Guan 《Microwave Theory and Techniques》1994,42(10):1998-2006
A numerical procedure using the finite-difference technique, simultaneous iteration based on the power method, and the Chebyshev-polynomial preconditioning is proposed to analyze dielectric-loaded cavities. The merit of this method is that no matrix inversions are invoked and the convergence rate of the power method is greatly accelerated by the preconditioning. The TE, TM, and hybrid modes in axisymmetrical cavities loaded with a rod or ring dielectric resonator are analyzed. For the hybrid modes, an Hr-Hz formulation is proposed. Accurate numerical results are obtained efficiently and no spurious solutions are found by the present method 相似文献
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针对压电谐振器振动特性分析的应用需求,构建了一种小型化、廉价的矢量分析系统。系统采用STM32控制4路DDS芯片产生驱动信号和矢量解析正交信号。通过向DDS芯片写频率控制字,对压电谐振器进行扫频驱动。同时采用STM32内置ADC,采样并计算获取各频率点压电谐振器输出信号的幅值和相位。通过提取压电谐振器两个特殊振动模态下的共振频率、品质因数(Q值)、输出信号相位等振动特性参数,获得驱动信号对这些参数的影响规律,系统分析了驱动信号对压电谐振器振动特性的影响,为压电谐振器的驱动、信号检测提供了有效的技术途径,实验结果为压电谐振器振动特性分析提供了依据。 相似文献
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该文提出一种基于谐振器慢波传输线的小型化宽阻带谐波抑制功分器,该谐振器慢波传输线由矩形谐振器、T型谐振器和蛇形线构成,来取代功分器中的1/4波长传统微带传输线。所设计制作的功分器,其尺寸仅为传统微带功分器的37.4%。实验结果表明,该功分器回波损耗大于10 dB的带宽范围为0.1~1.19 GHz,在2.2~11.05 GHz频率范围内衰减大于20 dB,具有较宽的阻带从而具有抑制谐波效果。仿真和测试结果较为吻合,验证了所提设计方法的有效性。 相似文献
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It is well known that two orthogonal resonant modes exist within a one-wavelength ring resonator. In this paper, we focus on a ring resonator possessing an impedance step as a form of perturbation. A convenient analyzing method for obtaining the resonance characteristics of this resonator structure is presented. Furthermore, generation of attenuation poles obtained by the dual-mode ring resonator is discussed. In addition, a filter design method based on this resonator is explained, followed by experimental results, which prove the validity of the proposed design method 相似文献
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A method is presented which allows to calculate the large signal beam efficiency of a gyromonotron working at the s-th harmonic of the cyclotron frequency. The results of this calculation using efficiency optimized parameters are given for different TEmn distributions and also for a magnetic taper. It is shown that beam efficiencies, which are higher than twice the value at constant electric and magnetic fields are theoretically possible. Also the influence of the beam voltage is considered. For a given beam voltage and a given electric field distribution in the resonator power calculations are performed and it is shown what powerlevels are available for different resonator modes and for different cyclotron harmonics. 相似文献
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《Microwave Theory and Techniques》1982,30(8):1259-1260
The sensitivity of resonator quality-factor measurements using the decrement method can be improved by the comparison of the decay curve of a measured resonator with that of a reference standard resonator. The decay curves are compared using the integral of the function given as difference between decay curves. The comparison method, to be proposed, also has the advantage that the calibration of neither time base nor power scale is needed. Some results of the experimental verification are presented. 相似文献
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A. V. Ustinov Y. K. Fetisov S. V. Lebedev G. Srinivasan 《Journal of Communications Technology and Electronics》2010,55(12):1416-1423
Bistability in a planar resonator containing an iron-yttrium garnet ferrite film and a lead zirconate titanate (PZT) plate
is studied. The characteristics of the bistable resonator are measured in a frequency band of 0.8–16 GHz at an excitation
power level ranging from 1 to 20 mW. Magnetic and electric tuning of the resonator frequency and switching of the resonator
between stable states with the use of weak magnetic (∼0.5 Oe) and electric (0.75 kV/cm) fields are demonstrated. It is shown
that, as the excitation power increases, the resonator’s switching time decreases from ∼1.7 to ∼0.3 μs. 相似文献
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多棒平行平面腔动态工作特性的研究 总被引:1,自引:0,他引:1
基于等价腔方法,将高功率固体激光器使用的二棒平行平面腔的结果推广到多棒平行平面腔。推导出了g*参数和等价腔长的解析表达式。对这类光腔的动态工作特性做了详细分析,并给出了数值计算例。研究表明,对两类多棒对称平行平面腔,在g*参数图上的动态特性曲线是过原点的一条直线。若多棒的热焦距有小的偏差,特性曲线不再是直线。然而,用适当调节镜和棒以及棒间距离的方法可以使特性曲线重新成为一条直线。因而采用这种方法可以补偿棒的热焦距偏差,给出了有关的数学公式。 相似文献
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石英谐振器可以作为传感器的敏感元件。为了减小温度等因素的干扰,提高石英晶体谐振器力敏特性,通过能陷理论及其厚度剪切石英晶体谐振能量分布曲线的计算,在同一圆形晶片上设计了多电极力敏谐振器集群。根据共模抑制原理,将谐振器集群输出频率信号作差频处理,以此抑制温度等因素的干扰,再将差频信号叠加以提高石英晶体谐振器集群整体力敏特性。实验结果表明,石英谐振器集群差频输出的温频特性明显优于传统的单电极谐振器,石英晶体谐振器集群整体力灵敏度系数提高到9 992 Hz/N。 相似文献