Pyramidal Microwave Absorber Design for Anechoic Chamber in the Microwave Frequency Range of 1GHz to 10GHz

2019 ◽  
Vol 4 (10) ◽  
pp. 1-3
Author(s):  
Stella Ifeoma Orakwue ◽  
Igochi Praise Onu
Keyword(s):  
Computer Simulation ◽  
Microwave Frequency ◽  
Microwave Absorber ◽  
Anechoic Chamber ◽  
Frequency Range ◽  
Simulation Technology ◽  
Port Harcourt ◽  
Simulation Results ◽  
The Cost ◽  
The University

The design of microwave absorbers is directly correlated to the general performance of an anechoic chamber for its signal absorptive capabilities. However, the cost of importing the total required microwave absorber for the 5m × 4m × 3m proposed anechoic chamber in the University of Port Harcourt Nigeria is at the tune of twenty-seven thousand dollars. This research is carried out to simulate and fabricate the microwave absorber using polyurethane material and locally obtained carbon in order to reduce cost. The simulation is done using Computer Simulation Technology (CST) software for the desired frequency range of 1GHz to 10GHz. Simulation results proved to have good absorptive performance and reflectivity loss comparable to that of the conventional microwave absorber. The reflectivity performance is below -30dB across the desired frequency range. With the polyurethane material and locally obtained conducting carbon the estimated cost is five thousand five hundred dollars against the twenty-seven thousand dollars importation cost; thereby reducing the cost by more than 60%.

Simulation and experimentation of wide frequency electromagnetic shielding coating used for carbon fiber composite materials of track vehicles

2019 ◽  
Vol 33 (01n03) ◽  
pp. 1940020 ◽  
Author(s):  
Ming Gong ◽  
Shou-Guang Sun ◽  
Lin Sun ◽  
Ai-Qin Tian ◽  
Qiang Li
Keyword(s):  
Computer Simulation ◽  
Composite Materials ◽  
Carbon Fiber ◽  
Fiber Composite ◽  
Electromagnetic Shielding ◽  
Shielding Effectiveness ◽  
Frequency Range ◽  
Simulation Technology ◽  
Carbon Fiber Composite ◽  
Fiber Composite Materials

Computer Simulation Technology EM and Computer Simulation Technology Microwave Studio electromagnetic simulation software were used to simulate the carbon fiber composite materials with a new type of wide frequency electromagnetic shielding coating. DC magnetic field, low-frequency electromagnetic fields, and mid-high frequency electromagnetic shielding effectiveness analysis model were established in order to study the influence of permeability, conductivity, coating thickness and other parameters in the typical frequency range research on the shielding effectiveness. The results show that the composite coating material with reasonable design can effectively enhance the electromagnetic shielding performance of carbon fiber composite materials in the DC [Formula: see text]18 GHz frequency range.

scholarly journals Performance Study of Coconut Coir Pyra-Shape Absorber Design

2020 ◽  
pp. 409-413
Author(s):  
Juliana Md Sharif ◽  
◽  
Dayana Kamarul Bahrin ◽  
Rohaiza Baharudin ◽  
Asmalia Zanal ◽  
...  
Keyword(s):  
Major Part ◽  
Microwave Absorber ◽  
Anechoic Chamber ◽  
Frequency Range ◽  
Performance Study ◽  
Agriculture Waste ◽  
Microwave Absorbers ◽  
Chemical Substances ◽  
Alternative Material ◽  
Coconut Coir

Agriculture waste has huge potential to be used as an alternative material for constructing microwave absorber which is typically used in an anechoic chamber. The existing microwave absorbers are normally manufactured from chemical substances. This project is proposing the use of a new composite biomass material namely coconut coir, for constructing microwave absorbers. Generally, pyramidal shape is chosen since it is commonly used in the industry. The major part of this project involves an intense study in designing and developing the best techniques to construct pyramidal shape microwave absorber. The frequency range investigated in this work is between 1GHz to 12GHz. Referring to the commercial absorber as the standard, the reflectivity performance of this coconut coir pyramidal absorber was thoroughly investigated in this research. It is then proven that the biomass material used in this study is found to have a significant impact on the microwave absorber performance.

scholarly journals USE OF SIMULATION SIMULATION TO SOLVE THE PROBLEMS OF REENGINEERING BUSINESS PROCESSES IN ANYLOGIC SIMULATION ENVIRONMENT

2021 ◽  
Vol 8 (1) ◽  
pp. 067-075
Author(s):  
Y. Y. Fyalkovskiy ◽  
Keyword(s):  
Computer Simulation ◽  
Business Processes ◽  
Enterprise Management ◽  
Simulation Environment ◽  
Use Of Resources ◽  
Building Models ◽  
Simulation Results ◽  
The Cost ◽  
Simulation Systems ◽  
Models And Modeling

Successful enterprise management in modern conditions requires the optimization of its business processes. This problem can be solved using simulation, which involves the construction of models that describe the processes as they would in reality. Based on the simulation results, decisions are made to improve the technology and methodology for performing business processes, rational use of resources, reduce the cost of business processes, etc. The paper considers the practical aspects of building models and modeling using one of the popular computer simulation systems Anylogic.

scholarly journals Design and simulation double Ku-band Vivaldi antenna

2022 ◽  
Vol 25 (1) ◽  
pp. 396
Author(s):  
Huda Ibrahim Hamd ◽  
Israa Hazem Ali ◽  
Ahmed Mohammed Ahmed
Keyword(s):  
Computer Simulation ◽  
Wireless Communication ◽  
Simulation Technology ◽  
Band Frequency ◽  
Simulation Results ◽  
Vivaldi Antenna ◽  
Microstrip Feed ◽  
Ku Band

Due to the tremendous development in the field of wireless communication and its use in several fields, whether military or commercial was proposed. A novel tapered slot Vivaldi antenna is designed and simulated at double band frequency (Ku-band) using computer simulation technology (CST) software 2020. The dimensions of the antenna are 2.3 × 1 × 0.4 mm<sup>3</sup> with a microstrip feed of 0.5 mm. The proposed antenna is improved by cutting a number of circle shapes on the patch layer in different positions. The simulation results are divided into more sections according to the number of circle shapes cutting. The results are good acceptance and make the improved Vivaldi antenna valuable in many future wireless communication applications.

scholarly journals Radiation Pattern Synthesis of Planar Arrays Using Parasitic Patches Fed by a Small Number of Active Elements

2020 ◽  
Author(s):  
Jafar Ramadhan Mohammed ◽  
Karam Mudhafar Younus
Keyword(s):  
Computer Simulation ◽  
Radiation Pattern ◽  
Sidelobe Level ◽  
Pattern Synthesis ◽  
Active Elements ◽  
Array Pattern ◽  
Planar Arrays ◽  
Planar Array ◽  
Simulation Results ◽  
The Cost

In this chapter, several planar array designs based on the use of a small number of the active elements located at the center of the planar array surrounded by another number of the uniformly distributed parasitic elements are investigated. The parasitic elements are used to modify the radiation pattern of the central active elements. The overall radiation pattern of the resulting planar array with a small number of active elements is found to be comparable to that of the fully active array elements with a smaller sidelobe level (SLL) at the cost of a relatively wider beamwidth and lower directivity. Nevertheless, the uses of only a small number of the active elements provide a very simple feeding network that reduces the cost and the complexity of the array. Simulation results which have been computed using computer simulation technology-microwave studio (CST-MWS) show that the sidelobe level of the designed array pattern with parasitic elements is considerably better than that of the similar fully active array elements. The proposed array can be effectively and efficiently used in the applications that require wider antenna beams.

Integrating Legacy Laboratory Information Systems into a Client-Server World: The University of Minnesota Clinical Workstation (CWS) Project

1995 ◽  
Vol 34 (03) ◽  
pp. 289-296 ◽  
Author(s):  
B. H. Sielaff ◽  
D. P. Connelly ◽  
K. E. Willard
Keyword(s):  
Information Systems ◽  
Clinical Decision ◽  
Database Management System ◽  
University Of Minnesota ◽  
Client Server ◽  
Clinical Workstation ◽  
Future Hospital ◽  
The Cost ◽  
The University ◽  
Laboratory Information Systems

Abstract:The development of an innovative clinical decision-support project such as the University of Minnesota’s Clinical Workstation initiative mandates the use of modern client-server network architectures. Preexisting conventional laboratory information systems (LIS) cannot be quickly replaced with client-server equivalents because of the cost and relative unavailability of such systems. Thus, embedding strategies that effectively integrate legacy information systems are needed. Our strategy led to the adoption of a multi-layered connection architecture that provides a data feed from our existing LIS to a new network-based relational database management system. By careful design, we maximize the use of open standards in our layered connection structure to provide data, requisition, or event messaging in several formats. Each layer is optimized to provide needed services to existing hospital clients and is well positioned to support future hospital network clients.

SIMULATION OF SOFT START OF SYNCHRONOUS ELECTRIC DRIVES

2019 ◽  
Author(s):  
Shakhboz Dadabaev
Keyword(s):  
Computer Simulation ◽  
Electric Drive ◽  
Water Supply Systems ◽  
Factors Affecting ◽  
Electric Drives ◽  
Soft Start ◽  
Simulation Results ◽  
Pumping Units ◽  
Negative Factors ◽  
Supply Systems

The main negative factors affecting the starting modes of synchronous electric drives of pumping units of irrigation water supply systems were identified, computer simulation of direct and soft start of synchronous electric drive was made, the simulation results are shown in graphs and a brief conclusion was made on the study.

Computer simulation to evaluate the economics of landfill gas recovery

1998 ◽  
Vol 38 (2) ◽  
pp. 201-208
Author(s):  
M. W. Milke
Keyword(s):  
Computer Simulation ◽  
Computer Program ◽  
Landfill Gas ◽  
Base Case ◽  
Simulation Tool ◽  
Hypothetical Case ◽  
Gas Recovery ◽  
Fixed Set ◽  
Key Variables ◽  
Simulation Results

A need exists for tools to improve evaluations of the economics of landfill gas recovery. A computer simulation tool is presented. It uses a spreadsheet computer program to calculate the economics for a fixed set of inputs, and a simulation program to consider variations in the inputs. The method calculates the methane generated each year, and estimates the costs and incomes associated with the recovery and sale of the gas. Base case results are presented for a city of 500,000. An uncertainty analysis for a hypothetical case is presented. The simulation results can help an analyst see the key variables affecting the economics of a project.

EBG at microwave frequency range: Bragg and/or resonant effect?

2004 ◽  
Vol 42 (5) ◽  
pp. 383-385 ◽  
Author(s):  
Asier Ibáñez Loinaz ◽  
Carlos del Río Bocio
Keyword(s):  
Microwave Frequency ◽  
Frequency Range ◽  
Resonant Effect
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