Dispersion data for open suspended microstrip on Alumina and Gallium Arsenide substrates

Accurate dispersion data for open suspended microstrop on RT-duroid and fused quartz substrates was presented in an earlier paper by the authors. The present work repeats the same exercise for two more commonly used substrate materials, namely, Alumina and Gallium Arsenide. The results are new and will be a very useful addition to the millimeter-wave circuit designer's library.     

Input impedance calculation for a cylindrical microstrip antenna fed by a microstrip line

We consider the problem of excitation of a cylindrical microstrip antenna fed by a cylindrical microstrip line. The problem has been solved by the moments method in the spatial domain using a new representation of the Green’s function. In the model proposed, a cylindrical microstrip line of finite length is attached to the patch and is considered as its part. The so-called lumped delta generator is chosen as the excitation source. At the first stage, current distributions on the patch and in the microstrip line are found by solution of the integral equation. Then using the well-known relations of the transmission-line theory and the equivalent-scheme method, we calculate the reflection coefficient in the microstrip line and the antenna input impedance. Patches of different shapes are discussed. __________ Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Radiofizika, Vol. 51, No. 3, pp. 223–233, March 2008.     

New accurate data for the spectrum of neutral silver

High resolution spectra of neutral silver have been recorded by Fourier Transform Spectrometry in the region 2 000-8 280 ?(50 000-12 000 cm^-1) with silver-neon and silver-argon hollow cathode lamps as sources. This work represents order-of-magnitude improvements, compared to previous work on Ag I, in accuracy of transition wavelengths and wavenumbers, and energy level values. 35 classified Ag I transitions are given, and the wavenumber uncertainty for the strongest lines is less than 0.002 cm^-1. Improved values for 28 energy levels are presented. Received 31 January 2000 and Received in final form 13 June 2000     

Light-controlled microstrip line coupler

Conclusions We have analyzed coupling properties of the coupled microstrip lines whose substrate contain electron-hole plasma by means of the spectral domain method. Scattering parameters in each ports have been evaluated numerically as a function of plasma density.Experiments were carried out using high resistivity silicon and LEDs. The agreement of the theoretical and experimental results was satisfactory. The plasma density observed in the experiments is one-third as large as the theoretically estimated value.     

一种精确计算毫米波矩形微带天线贴片元物理尺寸的新方法

为了使矩形微带天线的实际谐振频率和设计频率相一致,矩形贴片元物理尺寸的精确计算是非常重要的。文中在腔模理论的基础上,计入辐射损耗,提出了一种精确计算毫米波矩形微带天线贴片元物理尺寸的新方法,并利用该方法计算设计了四元毫米波矩形微带贴片天线,仿真和实测结果证实了该方法的有效性。     

Computer-aided design for finlines and suspended-substrate microstrip lines

The computer-aided design of finlines and suspended-substrate microstrip lines are investigated. The numerical results of this paper show good agreement with those computed by other techniques for unilateral finlines and open suspended microstrip lines. The approach of this paper may be used to the computer-aided design of many other kinds of transmission lines and circuits for millimeter wave applications.     

Fundamental and parasitic wave modes of a shielded microstrip line

Conclusions It was demonstrated that for the usually employed widths of the shield in MSL a parasitic quasi-LM₁₀ wave may propagate besides the working quasi-TEM wave; the quasi-LM₁₀ wave interacts with the working wave in the inhomogeneities of the line and may disrupt the normal operation of devices having MSL. The propagation constants of these two lower wave modes may be determined comparatively simply with an accuracy of the order of 1% by means of the first-approximation dispersion equation derived in the present paper. The system of linear algebraic equations derived in the present paper may serve for the analysis and calculation of the characteristics of the higher wave modes.Patrice Lumumba University of Friendship among Peoples. Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Radiofizika, Vol. 16, No. 1, pp. 118–128, January, 1973.     

Impedance of the microstrip line for magnetostatic backward volume waves

We study excitation of magnetostatic backward volume waves on the microstrip line. The relation between the current density in the line and the normal component of the magnetic induction is found. The impedance of the line per unit length, i.e., its reactance and radiation resistance per unit length, is represented as a functional of the current density. The dependence of the operating-wave radiation resistance on the transverse size of the line and the width of the dielectric gap is studied. The radiation resistances of multistrip array and meander-type converters of magnetostatic backward volume waves are calculated     

Analytical expressions for the electrodynamic characteristics of the fundamental mode of a microstrip line

Institute of Radio Engineering, Electronics, and Automation, Moscow. Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Radiofizika, Vol. 34, No. 5, pp. 601–603, May, 1991.     

基于BLT方程的微带线电磁耦合终端响应

为定量研究电磁波与微带线的耦合终端响应问题,提出一种基于BLT方程的电磁波与微带线耦合分析方法,相比传统方法计算效率高、占用内存少。将PCB板上微带线等效为有耗传输线模型,对辐照平面波进行矢量分析并求解等效激励源,运用BLT方程研究不同入射方式、脉冲波形对微带线终端的影响,并对入射波与终端响应进行了时域、频域分析。研究表明:当入射波频率与微带线长度满足一定关系式时对微带线的耦合最强,耦合电压峰值达2.4 mV;电场平行微带线入射比垂直PCB入射时的终端电压峰值大一倍;且同幅同脉宽的矩形脉冲较高斯脉冲和三角脉冲对微带线的耦合峰值电压大;不同波形的脉冲通过调节脉宽都可对微带线耦合终端电压达到mV量级。     

基于BLT方程的微带线电磁耦合终端响应

为定量研究电磁波与微带线的耦合终端响应问题,提出一种基于BLT方程的电磁波与微带线耦合分析方法,相比传统方法计算效率高、占用内存少。将PCB板上微带线等效为有耗传输线模型,对辐照平面波进行矢量分析并求解等效激励源,运用BLT方程研究不同入射方式、脉冲波形对微带线终端的影响,并对入射波与终端响应进行了时域、频域分析。研究表明：当入射波频率与微带线长度满足一定关系式时对微带线的耦合最强,耦合电压峰值达2.4 mV;电场平行微带线入射比垂直PCB入射时的终端电压峰值大一倍;且同幅同脉宽的矩形脉冲较高斯脉冲和三角脉冲对微带线的耦合峰值电压大;不同波形的脉冲通过调节脉宽都可对微带线耦合终端电压达到mV量级。     

An improved approximation to the microstrip line capacitance

A new empirical formula is presented for the normalised capacitance of microstrip lines. The formula uses a single equation to represent the microstrip line capacitance over the useful range of the aspect ratio. The maximum error of the new formula is contained within 0.8 percent and the relative root-mean-square error is contained within 0.55 percent. The new formula can be easily implemented in computeraided design and analysis as well as in hand calculations using pocket calculators.     

Conformal elliptic cone and cone multiconductor microstrip line

A Novel multiconductor elliptic cone microstrip lines are rigorously analyzed under the assumption of quasi-TEM mode. The Maxwell's capacitance matrix and characteristic impedance matrix are determined using the method of coordinates trnasformation and conformal mapping     

A twin slot antenna on a layered substrate coupled to a microstrip feed line

A method is described for calculating the input impedance as seen by the detector for a twin slot antenna structure. This technique is then used to analyze several twin slot antenna configurations, leading to improved performance.     

Optical microstrip patch antennas design and analysis

This paper has presented transparent conductor oxide materials (TCOMs) based microstrip patch antennas with glass substrate and copper ground plane, which have been deeply analyzed in the visible spectrum region in comparison with the practical patch antenna model of indium tin oxide patch with glass substrate and different TCOMs based ground plane. As well as the study have investigated the effect of transparent oxide materials on patch antenna design instead of perfect conductor materials such as copper that has low cost and weight. The tradeoff between optical transparency and electrical conductivity will be evaluated for a range of visible regions. Microstrip transmission line feed method is used to predict the skin effects on a patch antenna and their impact on antenna efficiency, resonance frequency and optical transmission are also described. This study have discussed assessment of these tradeoffs and effect of TCOMs parameters on antenna design.     

微带传输线束流信号展宽处理设计

对束流信号进行展宽处理是储存环逐束团位置测量RF前端设计的重要工作之一。针对上海光源储存环束流信号的特点,对束流信号展宽进行分析,采用低通滤波器和包络检波联合的方法对信号进行展宽。考虑到实现过程需要对信号进行ps量级的延时,使用微带传输线对该方法进行了具体设计。对微带传输线等效为集总参数LC元件进行推导以进行低通滤波器设计,给出了阻抗匹配方案以实现宽带功率分配器与合成器。仿真和实测结果表明,所设计的电路能够对束流信号进行有效展宽处理。