共查询到20条相似文献,搜索用时 140 毫秒
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本文用模式匹配法计算圆柱形对称和非对称介质谐振腔内任意谐振模式的谐振频率。文章对有关公式做了详细的推导和必要的简化,计算结果与实验和有关资料都很一致。 相似文献
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探讨了单负介质部分填充的圆柱谐振腔的基本特性,得到磁负介质或者电负介质部分填充的圆柱谐振腔中存在谐振频率与谐振腔尺寸无关的谐振模式,即存在亚波长谐振模式,并对之特性进行分析研究,得到了一些与普通谐振腔不同的奇特谐振特性。单负介质是容易获得的,从而可以实现亚波长谐振器以实现微波器件的小型化。 相似文献
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求解圆形介质杆谐振器的特征方程,得到了谐振模式图。TM_(010)模介质谐振器谐振频率的计算值与测量值相符。对介质杆谐振器的Q值进行了讨论。给出了S波段小型TM_(010)模介质谐振器滤波器的实验结果。 相似文献
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Coplanar Waveguide: A Surface Strip Transmission Line Suitable for Nonreciprocal Gyromagnetic Device Applications 总被引:2,自引:0,他引:2
《Microwave Theory and Techniques》1969,17(12):1087-1090
A coplanar waveguide consists of a strip of thin metallic film on the surface of a dielectric slab with two ground electrodes running adjacent and parallel to the strip. This novel transmission line readily lends itself to nonreciprocal magnetic device applications because of the built-in circularly polarized magnetic vector at the air-dielectric boundary between the conductors. Practical applications of the coplanar waveguide have been experimentally demonstrated by measurements on resonant isolators and differential phase shifters fabricated on low-loss dielectric substrates with high dielectric constants. Calculations have been made for the characteristic impedance, phase velocity, and ripper bound of attenuation of a transmission line whose electrodes are all on one side of a dielectric substrate. These calculations are in good agreement with preliminary experimental results. The coplanar configuration of the transmission system not only permits easy shunt connection of external elements in hybrid integrated circuits, but also adapts well to the fabrication of monolithic integrated systems. Low-loss dielectric substrates with high dielectric constants may be employed to reduce the longitudinal dimension of the integrated circuits because the characteristic impedance of the coplanar waveguide is relatively independent of the substrate thickness; this may be of vital importance for Iow-frequency integrated microwave systems. 相似文献
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Mutual coupling between metal strip antennas on finite size,electrically thick dielectric substrates 总被引:1,自引:0,他引:1
Parfitt A.J. Griffin D.W. Cole P.H. 《Antennas and Propagation, IEEE Transactions on》1993,41(1):108-115
An analysis of the mutual coupling between metal strip antennas which are contiguous with the ends of finite-size, electrically thick dielectric substrates is outlined. Such antennas have been proposed as useful monolithic microwave integrated circuit antennas for millimeter-wavelength applications. The analysis presented was verified experimentally, and the results are applied to three-element arrays of metal strip folded dipoles with coplanar strip feed lines. The effect of the electrically thick, finite-size dielectric substrates on the mutual coupling between elements of the arrays is described 相似文献
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《Microwave Theory and Techniques》1971,19(7):664-665
A method of determining the microwave dielectric constant of microwave integrated circuit substrates is described. The technique is especially suitable to substrates being prepared for MICs since they are, in general, regular, rectangular, and, therefore, simple resonators. The dielectric constant using this technique has been determined in the 2- to 12-GHz range for GaAs (/spl epsiv/R = 12.46), sapphire (/spl epsiv/R =9.37), polyguide (/spl epsiv/ =2.33), and Alsimag 772 (/spl epsiv/R = 10.08). 相似文献
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《Microwave Theory and Techniques》1983,31(11):950-954
For the first time, by a rigorous analysis, the performance of MIC planar transmission lines with Iossy substrates can be studied accurately. The generaf structural shape chosen for the analysis includes infinitely thin metallic strips embedded within the layers of homogeneous dielectric substrates. The rigor of the analysis was guaranteed by the assumption of the propagation of an electromagnetic hybrid wave (i.e., TE+TM) along tbe planar transmission lines. An efficient computation was, however, achieved by implementing the spectral domain approach as the basis for the analysis. To test the analysis, phase constants, characteristic impedances, and attenuations, due to dielectric losses, were computed for microstrip and coupled microstrip lines. The results obtained were compared with those given previously by the spectral domain analysis in which dielectric losses were not included directly [1]. The comparison showed an excellent agreement between the two theories for low-loss substrates. However, for Iossy substrates the present method is more accurate. 相似文献
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A unified full wave approach based on an extended method of lines is presented for the analysis of open planar waveguides. It can be used to analyze various open planar waveguides and is suitable especially for dielectric substrates with discontinuities and/or with finite ground planes where a full wave approach is not available yet. The convergence of the method is examined by numerical experiments. As application examples, the dispersion characteristics of open single and coupled microstrip lines with finite dielectric substrates are calculated and compared with the full wave results for structures with infinite width dielectric/conductor and the available quasi-static results for single microstrip line with finite dielectric in the literature. The effect of dielectric width on the characteristics is also discussed 相似文献
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E. B. Liao Hongyu Li L. H. Guo Guo-Qiang Lo Rakesh Kumar N. Balasubramanian Dim-Lee Kwong 《Electron Devices, IEEE Transactions on》2007,54(3):425-432
In this paper, radio frequency (RF), dc, and reliability performance have been studied on metal-insulator-metal (MIM) capacitors embedded in organic substrates. The MIM structure including ~74-nm SiN dielectric was prefabricated on Si and then transferred onto organic substrates (FR-4) by wafer-transfer technology (WTT). The RF characteristics up to 30 GHz were investigated by equivalent lumped circuit modeling, showing that the parameters associated with the MIM layers including the main capacitance, parasitic inductance, and resistance were only slightly changed by the WTT process. The substrate-related parasitics were reduced as a result of the replacement of lossy Si with insulating FR-4 substrates. Excellent capacitance linearity, low voltage coefficient (~2.2 ppm/V2), and temperature coefficient (~38 ppm/degC) were obtained for capacitors on FR-4 substrates. Current-voltage and time-dependent dielectric breakdown tests verified that, after the harsh processes of WTT, the MIM structures maintained the intrinsic reliability as those originally fabricated on Si. This paper, along with earlier reports, proved that WTT presented a new dimension to realize embedded capacitors for high-density circuit board and system-on-package applications 相似文献
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External field coupling to MTL networks with nonlinear junctions:numerical modeling and experimental validation 总被引:1,自引:0,他引:1
Lapohos T. LoVetri J. Seregelyi J. 《Electromagnetic Compatibility, IEEE Transactions on》2000,42(1):16-28
The problem of predicting the voltages and currents induced on a printed circuit multiconductor transmission line (MTL) network by an impinging transient plane wave electromagnetic field is considered. The MTL network contains nonlinear circuit elements and test cases with various dielectric substrates are examined. Numerical predictions based on quasi-TEM models of the MTL and modified nodal analysis (MNA) models of the lumped element junctions are compared to experimental results obtained in the time domain using a GTEM cell. As has been done in the past, the effect of the incident plane wave is introduced as forcing functions in the MTL equations. The primary goal of this paper is to quantify the accuracy of the various commonly used quasi-TEM mathematical time-domain models. It is shown that when modeling the forcing function terms, it is important to take into account the perturbation of the incident plane wave due to the dielectric substrate. (The experimental-numerical comparisons herein are shown for the case of end-fire illumination since it best demonstrates this point.) Neglecting the dielectric effect on the incident transient pulse, even for substrates with low dielectric constant, produces poor results 相似文献
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《Microwave Theory and Techniques》1975,23(6):504-506
Experimental circulators using ferrite pucks which have been sprayed into cavities in dielectric substrates by an arc-plasma spray (APS) process are described. 相似文献
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Analysis of the tapered slot antenna 总被引:7,自引:0,他引:7
A method for calculating the radiation pattern of end-fire tapered slot antennas with or without dielectric substrate is presented. The method involves a two-step procedure: 1) determine the field distribution of a traveling wave along the tapered slot, and 2) compute the radiation from this slot field by using the half-plane Green's function to account for termination effects. Acceptable estimates of the slot field usually can be obtained from a stepped approximation to the tapered geometry. The method has been verified by comparisons to measured patterns for various dielectric substrates and antenna dimensions. However, the effect of lateral truncation has not yet been successfully modeled. Experimental patterns showing this effect are presented. 相似文献