Thomas Lee, S; Dr.Nampoori,V P N; Dr. Radhakrishnan, P(Cochin University of Science & Technology, May , 2003)
[+]
[-]
Abstract:
Advent of lasers together with the advancement in fiber optics technology has revolutionized the sensor technology. Advancement in the telemetric applications of optical fiber based measurements is an added bonus. The present thesis describes variety of fiber based sensors using techniques like micro bending, long period grating and evanescent waves. Sensors to measure various physical and chemical parameters are described in this thesis.
Description:
International School of Photonics,
Cochin University of Science and Technology
Jacob,George; Dr.Mohanan, P(Cochin University of Science & Technology, June , 1998)
[+]
[-]
Abstract:
The thesis is the outcome of the experimental and theoretical investigations on a new compact drum-shaped microstrip antenna. A new compact antenna suitable for personal communication system(PCS), Global position System(GPS) and array applications is developed and analysed. The generalised cavity model and spatial fourier transform technique are suitably modified for the analysis of the antenna. The predicted results are compared with experimental results and excellent agreement is observed. The experimental work done by the author in related fields are incorporated as three appendices in this thesis. A single feed dual frequency microstrip antenne is presented in appendix A.Appendix B describes a new broadband dual frequeny microstrip antenna. The bandwidth enhancement effect of microstrip antennas through dielectric resonator loading is demonstarted in Appendix C.
Description:
Department of Electronics,
Cochin University of Science and Technology
Jacob,George; Aanandan,C K; Mohanan, P; K G Nair; Sreemoolanathan,H; Sebastian,M T(Microwave and Optical Technology Letters, February 20, 1998)
[+]
[-]
Abstract:
A new method for enhancing the 2.1 VSWR impedance
bandwidth of microstrip antennas is presented. Bandwidth enhancement
is achieved by loading the microstrip antenna by a ceramic microwave
dielectric resonator (DR). The validity of this technique has been established
using rectangular and circular radiating geometries. This method
improves the bandwidth of a rectangular microstrip antenna to more
than 10% (= 5 times that of a conventional rectangular microstrip
antenna) with an enhanced gain of I dB
Binoy,G S; Dr.Vasudevan, K(Cochin University of Science & Technology, June , 2002)
[+]
[-]
Abstract:
The thesis is the outcome of the experimental and theoretical investigations carried out on a novel slotted microstrip antenna.The antenna excites two resonance frequencies and provides orthogonal polarization. The radiation characteristics of the antenna are studied in detail. The antenna design is optimized using IE3D electromagnetic simulation tool. The frequency-Difference Time-Domain (FDTD) method is employed for the analysis of the antenna.The antenna can be used for personal and satellite communication applications.
Description:
Department of Electronics, Cochin University of Science and Technology.
Sreedevi, Menon K; Lethakumary,B; Bijumon, P V; Sebastian,M T; Mohanan, P(Microwave and Optical Technology Letters, May 5, 2005)
[+]
[-]
Abstract:
In this paper, the advantages of using L-shaped microviij)
feed to e.tcite a rectangular dielectric resonator cuuenna (DRA) by elemanagnetic
coupling are presented. This feeding technique enhances the
hardsvidth and gain of the antenna without affecting its size. The experimental
re srdts are validated using Fidelity software based on the finitedifference
tine-domain (FDTD) method
Poulose Jacob,K; Preetha, K G; Unnikrishnan, A(arXiv preprint arXiv:1208.4192, August 21, 2012)
[+]
[-]
Abstract:
Mobile Ad-hoc Networks (MANETS) consists of a collection of mobile nodes without having a central
coordination. In MANET, node mobility and dynamic topology play an important role in the performance.
MANET provide a solution for network connection at anywhere and at any time. The major features of
MANET are quick set up, self organization and self maintenance. Routing is a major challenge in MANET
due to it’s dynamic topology and high mobility. Several routing algorithms have been developed for
routing. This paper studies the AODV protocol and how AODV is performed under multiple connections in
the network. Several issues have been identified. The bandwidth is recognized as the prominent factor
reducing the performance of the network. This paper gives an improvement of normal AODV for
simultaneous multiple connections under the consideration of bandwidth of node.
Description:
International Journal on AdHoc Networking Systems (IJANS) Vol. 2, No. 3, July 2012