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Triple Notched Band Characteristics UWB Antenna Using C-Shaped Slots and Slot-Type Capacitively-Loaded Loop (CLL)

Journal of Electromagnetic Analysis and Applications 2013年第8期5卷 342-345页

作者： ahmed zitouni Noureddine Boukli-Hacene Laboratory of Telecommunications Faculty of Science and Engineering University Hassiba Benbouali of Chlef Chlef Algeria Laboratory of Telecommunications Faculty of Technology University of Tlemcen Tlemcen Algeria

Ultra wide bands antennas with notched bands characteristics have recently been considered for efficient communication between devices. In this paper, a compact ultra-wideband antenna (UWB) for UWB applications with triple bandnotched characteristics is presented. The proposed antenna consists of a square patch with four truncated corners and a partial ground plane with a rectangular slit. The operation bandwidth of the designed antenna is from 2.66 GHz to more than 13.5 GHz. Band-notched characteristics of antenna to reject the frequency band of 3.18 - 3.59 GHz and 4.70 - 5.88 GHz, is realized by inserting two C-shaped slots in the patch, the third band of 9.54 - 12.22 GHz is achieved by slottype capacitively-loaded loop (CLL) inserted in the patch near the feed line. Details of the proposed antenna design and simulated results are presented and discussed.

关键词： Microstrip Antenna Ultra-Wideband Antenna UWB C-Shaped Slot Capacitively-Loaded Loop (CLL) Three-Band Notched Characteristics

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A New Approach Based on Set Partitioning in Hierarchical Tree Algorithm for Image Compression

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Computer Technology and Application 2011年第4期2卷 270-279页

作者： zitouni Athmane Baarir Zine Eddine Ouafi Abd Elkarim Taleb ahmed Abdelmalik LESIA Laboratory of Research Electronic Department University of Biskra Algeria Universite of Valenciennes and Hainaut Cambrdsis FRE CNRS 3304 UVHC LAMIH le mont houy 59313 Valenciennes Cedex 9 France

In this paper, the authors propose a new approach to image compression based on the principle of Set Partitioning in Hierarchical Tree algorithm （SPIHT）. Our approach, the modified SPIHT （MSPIHT）, distributes entropy differently than SPIHT and also optimizes the coding. This approach can produce results that are a significant improvement on the Peak Signal-to-Noise Ratio （PSNR） and compression ratio obtained by SPIHT algorithm, without affecting the computing time. These results are also comparable with those obtained using the Embedded Zerotree Wavelet （EZW） and Joint Photographic Experts Group 2000 （JPG2） algorithms.

关键词： Image compression set partitioning in hierarchical tree (SPIHT) MSPIHT entropy coding peak signal-to-noise ratio (PSNR) compression ratio.

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