Binu, Paul; Dr.Mohanan, P(Cochin University of Science & Technology, September , 2005)
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Abstract:
The thesis explores the outcome of the exhaustive theoretical and experimental investigations performed on Octagonal Microstrip Antenna configurations. Development of the MATLAB TM backed 3D-Conformal Finite Difference Time Domain (CFDTD)Modeller for the numerical computation of the radiation characteristics of the antenna is the theme of the work. The predicted results are verified experimentally and by IE3D TM simulation. The influence of the patch dimensions,feed configurations,feed dimensions and feed positions upon the radiation performance of the antenna is studied in detail. Octagonal Microstrip Antenna configurations suitable for Mobile-Bluetooth application is dealt in detail. A simple design formula for the regular Octagonal geometry is also presented. A compact planar multi band antenna for GPS/DCS/2.4/5.8GHz WLAN application is included as appendix A. Planar near field measurement technique is explained in appendix B.
Description:
Department of Electroncis,
Cochin University of Science and Technology
Mridula, S; Dr.Mohanan, P(Cochin University Of Science And Technology, July 7, 2005)
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Abstract:
The thesis relates to the investigations carried out on Rectangular Dielectric
Resonator Antenna configurations suitable for Mobile Communication applications.
The main objectives of the research are to:
- numerically compute the radiation characteristics of a Rectangular DRA
- identify the resonant modes
- validate the numerically predicted data through simulation and experiment
0 ascertain the influence of the geometrical and material parameters upon the
radiation behaviour of the antenna
° develop compact Rectangular DRA configurations suitable for Mobile
Communication applications
Although approximate methods exist to compute the resonant frequency of
Rectangular DRA’s, no rigorous analysis techniques have been developed so far to
evaluate the resonant modes. In this thesis a 3D-FDTD (Finite Difference Time
Domain) Modeller is developed using MATLAB® for the numerical computation of the radiation characteristics of the Rectangular DRA. The F DTD method is a
powerful yet simple algorithm that involves the discretimtion and solution of the
derivative form of Maxwell’s curl equations in the time domain.
Description:
Department of Electronics, Cochin University of Science and
Technology
Sarin, V.P; Dr. K. Vasudevan(Cochin University of Science and Technology, January 14, 2012)
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Abstract:
With the recent progress and rapid increase in mobile terminals, the design of
antennas for small mobile terminals is acquiring great importance. In view of this
situation, several design concepts are already been addressed by the scientists and
engineers. Compactness and efficiency are the major criteria for mobile terminal
antennas. The challenging task of the microwave scientists and engineers is to device
compact printed radiating systems having broadband behavior, together with good
efficiency. Printed antenna technology has received popularity among antenna
scientists after the introduction of microstrip antenna in 1970s. The successors in this
kind such as printed monopoles and planar inverted F are also equally important.
Scientists and Engineers are trying to explore this technology as a viable coast
effective solution for forthcoming microwave revolution. The transmission line
perspectives of antennas are very interesting. The concept behind any
electromagnetic radiator is simple. Any electromagnetic system with a discontinuity
is radiating electromagnetic energy. The size, shape and the orientation of the
discontinuities controls the radiation characteristics of the system such as radiation
pattern, gain, polarization etc. It can be either resonant or non resonant structure.