1. PROPOSAL OF MULTI-BAND BAND PASS FILTER THROUGH DEFECTED GROUND STRUCTURE TECHNIQUE

Authors -  K. Srinivasan, S. Bhuvaneswari

Abstract :  In the present global scenario, owing to the continuous development of wireless communications, the need for different allocated frequency bands for each service increases. The main challenge in the development of wireless technology is to meet this advancement with low cost, small size and high performance. The design of multi-band band pass filters thus finds great interest in wireless receivers. The specifications of the band pass filter such as center frequency and location of transmission zeros can be adjusted depending on the applications. In this paper, the filter is designed using open circuited stubs. The concept of open circuited stubs also adds to one pass band. Also, the concept of defected ground structure is used. The main characteristics of DGS are slow wave effect and improved band stop characteristics. The designed band pass filter has the pass bands at 2 GHz and 4 GHz covering the frequency range of 1.5 GHz-2.5 GHz and 3.5 to 5.6 GHz. 
Keywords :Wireless Communication, Center frequency, Transmission zero, DGS, BPF

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2. AMBIENT RADIO FREQUENCY POWER HARVESTING BY YAGI ARRAY BROADBAND RECTENNA

Authors -  R. Premalatha, T. Jenish

Abstract :  A high efficiency Yagi array rectenna that can harvest ambient radio frequency power of UMTS-2100 band effectively were presented. The rectenna consists of a broad band antenna and a rectifier circuit. The proposed rectenna is based on a 1x4 Yagi array antenna with bandwidth from 1.83 GHz to 2.20 GHz and high gain of 10.920 dBi at 2.14 GHz. The rectifier is designed to convert the harvested RF power into dc voltage and is then combined with 1x4 Yagi array antennas to form a high efficiency rectenna. Simulation results show the Power Conversion Efficiency (PCE) of 86.69% and DC voltage of 200 mV is achieved at the input power of -20dBm respectively. The radiation characteristic and efficiency of the proposed rectenna are suitable for the purpose of ambient RF power harvesting application. 
Keywords : Energy Harvesting, Antenna Array, Yagi Antenna, Rectenna, Rectifier

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3. PROTECTED BIOMETRICS AUTHENTICATION METHOD THROUGH FPGA TECHNOQUE

Authors -  C. Senthil Singh, K. Manivannan

Abstract :  The objective of this research work is to process the iris biometrics for Iris recognition which is used for secured authentication system using Field Programmable Gate Array (FPGA). Iris recognition system is the most reliable system for an individual identification. However it is a complex process and computationally very expensive. Iris patterns possess a high degree of randomness and uniqueness. Our approach is based on the iris segmentation of the eye, using a mechanism called edge detection with different edge detection algorithms such as Sobel, Prewitt and Canny edge detection algorithms. In this work, the iris image is preprocessed using MATLAB Simulink block set to handle the edge detection operation where in the edge detection block finds the edges in an input image by approximating the gradient magnitude of the image. Further it is post processed to get normalized output image. The processing of image in real time is time consuming hence we have adopted hardware level implementation using FPGA which offers parallelism and significantly reducing the processing time. The different edge detection algorithms mentioned above are implemented in Spartan3E FPGA kit. The proposed design implements the architecture of different edge detection algorithms through XSG (Xilinx System Generator Tool). The generated net lists are synthesized using Xilinx ISE 10.2i development suite. The FPGA implementation is done via hardware software co-simulation from XSG, use limited resources at enhanced maximum operating frequency with lower processing time and higher security than commercial systems. 
Keywords : FPGA, Iris, Edge Detection, Thresholding, System Generator, Spartan3E

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ISSN (Online): 2348-3105 | ISSN (Print): 2347-6729
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