Rohith, Raj K; Dr.Mohanan, P(Cochin University of Science & Technology, August , 2007)
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Abstract:
The coplanar wave guide is an attractive device in microwave integrated
circuits due to its uniplanar nature, ease of fabrication and low production cost.
Several attempts are already done to explore the radiating modes in coplanar
wave guide transmission lines. Usually coplanar wave guides are excited by an
SMA connector with its centre conductor connected to the exact middle of the
centre strip and the outer ground conductor to the two ground strips. The mode
excited on it is purely a bound mode. The E-field distribution in the two slots are
out of phase and there for cancels at the far field. This thesis addresses an
attempt to excite an in phase E-field distribution in the two slots of the co planar
wave guide by employing a feed asymmetry, in order to get radiation from the two
large slot discontinuities of the coplanar waveguide. The omni directional
distribution of the radiating energy can be achieved by widening the centre strip.The first part of the thesis deals with the investigations on the resonance
phenomena of conventional coplanar waveguides at higher frequency bands.
Then an offset fed open circuited coplanar waveguide supporting
resonance/radiation phenomena is analyzed. Finally, a novel compact co planar
antenna geometry with dual band characteristics, suitable for mobile terminal
applications is designed and characterized using the inferences from the above
study.
Description:
Department of
Electronics, Cochin University of Science and Technology