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Karthika, K.
- Comparative Study of Pentagon Shaped Patch Antenna with Different Substrates Operating at WLAN Frequency
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1 Department of Electronics and Communication Engineering, Kumaraguru College of Technology, Coimbatore- 641048, Tamilnadu, IN
1 Department of Electronics and Communication Engineering, Kumaraguru College of Technology, Coimbatore- 641048, Tamilnadu, IN
Source
Research Journal of Engineering and Technology, Vol 8, No 3 (2017), Pagination: 259-262Abstract
Microstrip antenna finds a great attention for the past four decades due to their low profile, low cost and ease of fabrication. This work presents a design and analysis of pentagon shaped patch antenna operating at 5.8GHz (WLAN frequency). Substrate plays a vital role in the design antenna in terms of Miniaturization and bandwidth broadening. The comparative study is made by choosing different substrates such as FR4 and Roger in the design of proposed antenna. The effect of changing substrate material for the given antenna is observed in term of its gain, directivity, return loss, VSWR and Bandwidth. Size of the antenna is 25×25×1.6 mm3 makes it convenient for wireless communication systems. High Frequency Structure Simulator (HFSS) software is used to simulate the proposed antenna design.Keywords
Patch Antenna, Substrates, FR4, Roger, WLAN.References
- N. G. Alexopoulos, P. B. Katehi, D.B. Rutledge, "Substrate Optimization for Integrated Circuit Antennas", IEEE Transactions on Microwave Theory and Techniques, vol. 31, pp. 550-557, 1983.
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- D. Li, Y. Huang, Y. Shen, N. Khiabani, "Effects of Substrate on the Performance of Photoconductive THz Antennas", Proceeding of the iWAT 2010, pp. 1-4, 2010.
- Asok De et al., “Effect of different substrates on Compact stacked square Microstrip Antenna”, Journal of Telecommunications, Vol. 1 pp. 63-65, 2010
- Chuan Xiao et al., ''A New Patch Antenna with Magnetic Substrate for Active RFID Card'', Radio engineering, vol. 21.pp. 414-421, 2012.
- Ravindra Kumar yadav, et al., “Dielectric loading on multiband behaviours of pentagonal fractal patch antennas”, Open Journals of Antennas and Propagation,vol.1, pp. 49-56, 2013
- Kiran Jain, Keshav Gupta “Different Substrates Use in Microstrip Patch Antenna-A Survey", International Journal of Science and Research (IJSR), vol. 3, pp. 1802-1803, 2014.
- Yinting Liu, "Multiband Antenna for Satellite Navigation System", IEEE Antennas and Wireless Propagation Letters, vol. 15, pp. 1329-1332, 2015.
- S. Bedra, T. Fortaki, "Effects of Superstrate Layer on the Resonant Characteristics of Superconducting Rectangular Microstrip Patch Antenna" in Progress In Electromagnetics Research-C, pp. 1937-8718, 2016.
- K. Karthika, et al., "Pentagon Shaped Patch Antenna with EBG Structure for WLAN Applications", International Journal of Advanced Research in Electrical, Electronics and Instrumentation Engineering (IJAREEIE) vol. 6, Issue 5, 2017.
- Colour Image Encryption Using Chaotic System
Abstract Views :440 |
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Authors
Affiliations
1 Department of Electronics and Communication Engineering, Kumaraguru College of Technology, Coimbatore-641049, IN
1 Department of Electronics and Communication Engineering, Kumaraguru College of Technology, Coimbatore-641049, IN
Source
Research Journal of Engineering and Technology, Vol 8, No 4 (2017), Pagination: 301-305Abstract
In this paper, color image encryption using the chaotic algorithm for a highly secure transmission is proposed. The RGB image matrices are divided into blocks of 16 pixels such that every 16 pixels will be encrypted with different session keys using chaotic logistic map. This is done by changing the initial condition with change in key for every block of pixels. The proposed scheme utilizes two chaotic logistic maps and an external key of 80-bit. To make the cipher more sheltered, the secret key is customized after encrypting a block of pixels of the image. To improve the speed and Accuracy, the number of blocks of pixels for which the key has to be changed, is increased. The results of several experimental, statistical analysis and key sensitivity tests show that the proposed image encryption scheme provides an efficient and secure way for real-time image encryption and transmission.Keywords
Secure Image Encryption, Logistic Map, Pixels Block Division.References
- Zhu, Z., et al., “A chaos-based symmetric image encryption scheme using a bit-level permutation”. Information Sciences, 2011. 181(6): p. 1171-1186.
- Musheer ahmad, M. Shamsher Alam, 2009 “A new algorithm of encryption and decryption of image using Chaotic Mapping”, IJCSE, Vol.2 (1), pp.46-50.
- K.W. Wong, B.S.H. Kwok, W.S. Law, 2008 “A fast image encryption scheme based on chaotic standard map,” Phys.Lett. A, vol. 372, pp. 2645–2652.
- G. Chen, Y. Mao, C.K. Chui, 2004, “A symmetric image encryption based on 3D chaotic maps,” Chaos Solitons Fractals, vol. 21, pp. 749–761
- H.S. Kwok, W.K.S. Tang, 2007, “A fast image encryption system based on chaotic maps with finite precision representation,” Chaos Solitons Fractals, vol. 32, pp.1518–1529.
- N.K.Pareek, Vinod Patidar, K.K.Sud, 2006,” Image encryption using choatic logistic map”, Image and Vision Computing Volume 24,Issue 9, pp.926- 934.
- Ravindra K. Purwar, Priyanka, May 2013,” An improved image encryption scheme Using Chaotic Logistic Maps” IJLTET Volume 2, Issue 3, pp.220-227.
- Shubo Liu, Jing Sun, Zhengquan Xu, November 2009, “An improved image encryption algorithm based on chaotic system” Journal of computers, Volume 4, no.11, pp.1091-1100
- S. Li, X. Zheng, 2002, “Cryptanalysis of a chaotic image encryption method,” Proceedings of the IEEE International Symposium on circuits and systems, Scottsdale, AZ, USA.
- Vinod Patidar and K. K. Sud, 2008, “A pseudo random bit generator based on Chaotic Logistic Map and its Statistical Testing”, Informatica 33, May 20, pp.441-452.
- N.K. Pareek, Vinod Patidar, K.K. Sud, 2003, “Discrete chaotic cryptography using external key,” Phys. Lett., vol. 309, pp. 75–82.