Bijumon, P V; Dr.Sebastian, M T; Mohanan, P(Regional Research Laboratory (CSIR), August , 2005)
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Abstract:
This thesis presents the microwave dielectric properties of two novel dielectric
resonator materials with the composition Ca(Ca1/4Nb2/4Ti1/4)O3 and Ca(Ca1/4Ta2/4Ti1/4)O3
ceramics and their application in the fabrication of wideband antennas. The microwave
dielectric properties of the ceramics were tailored by several techniques such as doping,
glass addition and solid solution formations in the complex perovskite A and B-sites with
suitable substitutions. Among the wide variety of DRs developed, ceramic resonators
with optimum properties were identified to fabricate broadband dielectric resonator
loaded microstrip patch antennas. Furthermore, wideband, high permittivity dielectric
resonator antennas were fabricated and explored the possibility of tuning their
characteristics by modifying the feed line geometries.