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1.
Analysis of a centered-inclined waveguide slot coupler 总被引:5,自引:0,他引:5
Integral equations are developed for a centered-inclined coupling slot (including the effect of finite wall-thickness of the common broad-wall) and the slot-aperture electric intensity field is found using the method of moments. Numerical results for resonant length, backscattered wave amplitude, and phase variation off-resonance are presented over a range of values of the waveguide b dimension, wall thickness, slot width, and frequency. It is shown that the resonant length is relatively insensitive to slot tilt, &thetas;, for a standard-height X -band waveguide, whereas its dependence on &thetas; is significant for reduced-height waveguides. The phase variation of scattered TE10 waves in both waveguides off-resonance is less for wider slots and smaller b dimensions. Shunt-series coupling slots exhibit greater phase variation off resonance when compared to a centred-inclined coupling slot. Also, the former has a longer resonant length for a smaller b dimension and for a wider slot. Thus the centred-inclined slot coupler possesses superior characteristics. The higher-order mode coupling between a centred-inclined slot coupler and a pair of straddling radiating slots in the branch waveguide is significant 相似文献
2.
Mohanapriya Marimuthu Santhosh Rajendran Reshma Radhakrishnan Kalpana Rengarajan Shahzada Khurram Shafiq Ahmad Abdelaty Edrees Sayed Muhammad Shafiq 《计算机、材料和连续体(英文)》2023,74(3):4729-4745
Continuous improvements in very-large-scale integration (VLSI) technology and design software have significantly broadened the scope of digital signal processing (DSP) applications. The use of application-specific integrated circuits (ASICs) and programmable digital signal processors for many DSP applications have changed, even though new system implementations based on reconfigurable computing are becoming more complex. Adaptable platforms that combine hardware and software programmability efficiency are rapidly maturing with discrete wavelet transformation (DWT) and sophisticated computerized design techniques, which are much needed in today’s modern world. New research and commercial efforts to sustain power optimization, cost savings, and improved runtime effectiveness have been initiated as initial reconfigurable technologies have emerged. Hence, in this paper, it is proposed that the DWT method can be implemented on a field-programmable gate array in a digital architecture (FPGA-DA). We examined the effects of quantization on DWT performance in classification problems to demonstrate its reliability concerning fixed-point math implementations. The Advanced Encryption Standard (AES) algorithm for DWT learning used in this architecture is less responsive to resampling errors than the previously proposed solution in the literature using the artificial neural networks (ANN) method. By reducing hardware area by 57%, the proposed system has a higher throughput rate of 88.72%, reliability analysis of 95.5% compared to the other standard methods. 相似文献
3.
C. Lakshmi Vasudharini Moranam Ravi K. Thenmozhi John Bosco Balaguru Rayappan Rengarajan Amirtharajan 《Multimedia Systems》2020,26(3):301-311
Owing to the rapid development and advancements in the field of networks and communication, sharing of multimedia contents over insecure networks has becom 相似文献
4.
Surface impedance of elliptical hollow conducting waveguides 总被引:1,自引:0,他引:1
Currently the literature describes two approaches to the determination of power loss in the hollow metallic elliptical waveguide. The well known perturbation method employing the intrinsic impedance of the metal has frequently been used, and an ?-dependent surface impedance in two different forms has recently been proposed by several workers. In this work it is suggested that sufficient evidence exists to indicate that the ?-dependent formulation is unnecessary. 相似文献
5.
A rigorous analysis of a broad-wall slot coupler between two crossed rectangular waveguides is presented. The slot is longitudinal and offset from the center line in the main guide and is centered transverse in the branch guide. Integral equations are developed, taking into account finite wall thickness. The integral equations are then solved for the aperture electric field. Coupling slot characteristics are obtained, including the resonant length and dominant mode scattering. Numerical results for resonant length and scattering parameters are presented over a range of offsets, waveguide dimensions, and frequencies 相似文献
6.
1. Introduction The requirement of minimal bottom coverageand thick sidewall coverage for PVD-based films forlow via resistance and improved stress migration isnot easy to achieve with traditional depositionmethods. Modern I-PVD techniques give high bot-tom coverage, due to the ionized component of thedeposition flux. Sidewall coverage tends to be low,which is mainly due to off-normal deposition fluxand a less than unity sticking coefficient. 相似文献
7.
A simple and accurate technique is presented for obtaining the resonance frequency of the dominant odd and even modes of elliptical microstrip antennas and resonators. This method is validated by experiment. A previously published method is found to be inaccurate.<> 相似文献
8.
Rengarajan S.R. Gillespie E.S. Jr. 《Antennas and Propagation, IEEE Transactions on》1988,36(3):405-414
A detailed analysis is presented of assumptions and limitations of physical optics and stationary phase techniques for radome analysis. A two-dimensional ogival structure with an electric or magnetic line source inside is investigated. A method-of-moments analysis using J.H. Richmond's (1965) polarization current technique is performed to obtain reference results. Physical optics, uniform geometrical theory of diffraction, and stationary phase techniques of order 1 and 2 are analyzed 相似文献
9.
Ares F. Rengarajan S.R. Villaneuva E. Skochinski E. Moreno E. 《Electronics letters》1996,32(3):148-149
Simulated annealing and genetic algorithms are used for finding optimum excitations for patterns with null-filling. These methods have the advantage that the optimum aperture distribution with a minimal variation between excitations of adjacent elements is found without searching the entire solution space. A comparison between the performance of both methods shows that genetic algorithms are faster than simulated annealing, for this problem 相似文献
10.
B. Gopal Reddy Dr. Jonathan D. Silk Dr. Mariolina Salio Dr. Rengarajan Balamurugan Dr. Dawn Shepherd Gerd Ritter Dr. Vincenzo Cerundolo Prof. Dr. Richard R. Schmidt Prof. Dr. 《ChemMedChem》2009,4(2):171-175
Based on the crystal structures of human α‐GalCer–CD1d and iNKT–α‐GalCer–CD1d complexes, nonglycosidic analogues of α‐GalCer were synthesized. They activate iNKT cells resulting in dendritic cell maturation and the priming of antigen‐specific T and B cells. Therefore, they are attractive adjuvants in vaccination strategies for cancer and infectious diseases.