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This paper presents a correction algorithm for metal artefacts in CT images using a novel technique known as dual-step adaptive thresholding (DSAT). The proposed artefact correction algorithm was applied to selected artefactual phantom and clinical CT images. The missing projection data due to metal is detected and extracted by double-thresholding technique. The DSAT-based algorithm allows significant...
This paper presents measurement of 4times4 MIMO channel by using polarization diversity technique at 2.4 GHz. The measurement was carried out in indoor wireless environment and line-of-sight (LOS) condition. A linear polarization antenna was used at the transmitter (Tx) and receiver (Rx) with a distance of 3 meters. The results were compared with power correlation coefficient of different polarization...
In this paper, the meander line antenna (MLA) have been designed to operate at 2.4-GHz for WLAN application. Two different designs of meander line antenna are investigated, without conductor line and with conductor line. Microwave Office software is used for simulation designed process. The antenna is fabricated on a double-sided FR-4 printed circuit board using an etching technique. Then the design...
A beamforming network using Butler Matrix technique at WLAN application is presented. This paper describes the design, simulation and fabrication of a 4 times 4 Butler Matrix for the 2.4 GHz (WLAN). A Butler Matrix is a multiport component which when loaded with radiating elements enables production of a beam of microwave energy in a specified direction in transmission line, dependent upon which input...
In this paper, the meander line antenna have been designed to operate at 2.4-GHz for WLAN application. Two different designs of meander line antenna are investigates, without conductor line and with conductor line. The Microwave Office software is used for simulation design process. The antenna is fabricated on a double-sided FR-4 printed circuit board using an etching technique. Then the design has...
This project describe the design, fabricate and testing of feed network for 2times2 array antenna. This feed network was designed using Microwave Office 2004 with applied Wilkinson power divider to develop the design. The circuit was fabricated on a microstrip substrate with a dielectric constant epsivr =4.7, tan sigma =0.019 and thickness =1.6 mm. The project that had developed can support at IMT...
In data communication system, the outdoor of Wireless Local Area Network (WLAN) technology can be implemented in bridge connection. It allows LANs in separated buildings to be connected over the distance ranging in several hundred meters. In RF system design level, the performance of the WLAN bridge also relies on the RF receiver system where it must be well designed to minimize distortions in the...
In this paper, a modified slotted patch EBG structure has been investigated and followed by a discussion of the design and the evaluation of the structure. The result of the EBG structure in term of S21 is shown in simulation and measurement. The simulation process is being done using microwave office software 2006. The EBG structure is developed using inexpensive Fire Retardant-4 (FR4) board. The...
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