A Simple Design of Compact Size UWB Microstrip Antennas with Improved Performance
Mohamed Mahmoud Abdelwahab,
Ali Mohamed Gomaa,
Mahmoud Abdelhaliem Mohana,
Moataza Abdelhamied Hindy
Issue:
Volume 3, Issue 5, September 2017
Pages:
50-56
Received:
25 June 2017
Accepted:
17 July 2017
Published:
9 August 2017
Abstract: A compact size ultra-wideband (UWB) microstrip antenna with improved performance is proposed in this communication. In this article, the design of the antenna, which is based on the interaction between the circular patch and the rectangular slot cutting in the metal ground plane, as a result the required starting frequency can be achieved due the coupling between the metal ground plane and patch. UWB microstrip antenna is studied and designed using computer simulation. For verification of simulation results, the antenna is fabricated and measured. The simulation and measured results as reflection coefficient and radiation pattern are presented. Its measured results indicate that the proposed antennas achieve UWB from 1.49 GHz up to 18 GHz with improved the radiation pattern performance in the upper frequency range(up to 10 GHz). Proposed antenna achieve many wireless services including wireless local area (WLAN 2.5 or 5.6 GHz), GSM (1.71-1.88 GHz), PCS (1.93-1.99 GHz), Multiband GNNs, UWB (3.1-10.6 GHz), and for see through wall and concrete application.
Abstract: A compact size ultra-wideband (UWB) microstrip antenna with improved performance is proposed in this communication. In this article, the design of the antenna, which is based on the interaction between the circular patch and the rectangular slot cutting in the metal ground plane, as a result the required starting frequency can be achieved due the c...
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Further Results on Model Structure Validation for Closed Loop System Identification
Wang Jian-hong,
Wang Yan-xiang
Issue:
Volume 3, Issue 5, September 2017
Pages:
57-66
Received:
18 May 2017
Accepted:
28 June 2017
Published:
24 August 2017
Abstract: In this paper, further results on the problem of the model structure validation for closed loop system identification are proposed. One probabilistic model uncertainty is derived from some statistical properties of the parameter estimation. The uncertainties bound of the model parameter is constructed in the probability sense by using the inner product form of the asymptotic covariance matrix. Further a new technique for estimating bias and variance contributions to the model error is suggested. One bound described as an inequality corresponds to a condition on the model error. Due to this proposed bound, model structure validation process can be transformed to verify whether the model error obeys this inequality. Finally the simulation example results confirm the identification theoretical results.
Abstract: In this paper, further results on the problem of the model structure validation for closed loop system identification are proposed. One probabilistic model uncertainty is derived from some statistical properties of the parameter estimation. The uncertainties bound of the model parameter is constructed in the probability sense by using the inner pro...
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An Enterprise Resource Planning (ERP) Framework for Polytechnique Colleges in Ethiopia
Kassaye Tilahun,
Patrick Cerna
Issue:
Volume 3, Issue 5, September 2017
Pages:
67-74
Received:
23 May 2017
Accepted:
23 June 2017
Published:
26 October 2017
Abstract: Enterprise Resource Planning (ERP) is information system that integrates departments and functions across an organization into one computer system to streamline all the organizational process. Thus, each department across the organization shares a common centralized database, which enables the flow of information in the organization to be faster and reliable. Since, there is no common ERP framework design for specific domain; but most existing ERP framework design is based upon SOA (Service Oriented Architecture). This is because of SOA based ERP framework allows different applications to exchange data with one another effectively. This paper describes ERP framework design and implementation for Poly technique colleges in Ethiopia. To achieve this goal, we reviewed existing general ERP framework components and the process of various departments of poly technique colleges. The basic components we used in the framework are SOAP (Simple Object Access protocol) over HTTP (Hyper Text Transfer Protocol) protocol for communication between service consumers and service provider. The other component we applied is web service remote façade module integration mechanism to integrate each module. Finally, the researcher designed a novel framework that is suitable for the Poly Technique Colleges which show the integration among the internal department.
Abstract: Enterprise Resource Planning (ERP) is information system that integrates departments and functions across an organization into one computer system to streamline all the organizational process. Thus, each department across the organization shares a common centralized database, which enables the flow of information in the organization to be faster an...
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