Authors - P.K. Prakasha, A. Nalini
Abstract : Recently there have been several new concepts applied to the distributed microwave circuits. One such technique is defected ground structure, where the ground plane metal of a micro strips circuit is intentionally modified to enhance the performance. An analysis of normal and Micro strip patch antenna with defected ground structure is done in this paper. Defect has been created in the ground plane and some slots have been introduced in the patch of an antenna to enhance performance. Conventional form of patch antenna is employed in this technique. The proposed defected ground structure antenna is to increase the gain, bandwidth and directivity of the micro strip patch antenna. Our main aim is to convert this narrow band antenna into wide band and employ this antenna with wide band application. The bandwidth and gain of an antenna increases from 270 MHz and 3.95 dB to 315MHz and 4.77dB respectively by integrating it with defected ground structure. The design has been simulated using advanced design system 2016.
Keywords : Wireless application, DGS, Microstrip Patch Antenna, WIMAX, ADS
Authors - K. Saravanan, M. Swarna
Abstract : In the global scenario the network communication can be accessible to the entire world which is system of interconnected networks. IPv4 protocol in network enables data sharing between two or more computers which minimize time and energy wastages. In February 2011, all IPv4 addresses had vanished and now we are going for IPv6. Migration technique to IPv6 network is proposed in this project that overcomes all the limitations available in existing IPv4 network. Dual Stack migration, tunneling and translation migration techniques has been proposed in this paper to transmit IPv6 packet through IPv4 network that enables and achieves full convergence in IPv6 network. The application of dual stack, tunneling and translation techniques for migration from IPv4 to IPv6 has been simulated using Graphical Network Simulator 3 (GNS 3). The transfer of packets across the network for both static and dynamic scenarios has been implemented. The performance parameters like success rate and the minimum, average and maximum round - trip time, latency have been evaluated and analysed for the transmissions.
Keywords : Internet Protocol, Routers, Switches, Dual Stack, IPv4, IPv6
Authors - Sardar Ali, S. Rama
Abstract : Design of a compact microstrip-fed circularly polarized wide-slot antenna for wireless local area network applications was presented. The 3dB axial ratio band is attained by introducing a horizontal stub above the wide slot. The feed line is placed beneath the ground plane, which is perpendicular to the stub gives a T-shape. It is fabricated with the measurement of 25x25mm2. The antenna attains S11≤ -10dB impedance matching bandwidth of 90.2% from 3.5 to 9.25GHz, and a broadband 3dB AR bandwidth of 40%GHz, ranging from 4.6 to 6.9GHz. A peak gain of 0.8 to 4.5dBi is achieved within the AR band.
Keywords : WLAN, Wide Slot Antenna, Circularly Polarized, DTE, Feed Line
