Joseph, V P; Dr.Mathew, K T(Cochin University of Science And Technology, July , 1999)
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Abstract:
Investigations on the design and development of certain new hollow
dielectric hom antennas of rectangular cross section have been carried out. The main
shortcoming of the existing ordinary hollow dielectric hom antenna (HDH) is the
abrupt discontinuity at the feed-end. A new launching technique using a dielectric rod is
introduced to overcome this limitation. Also a strip loading technique is employed for
further modification of the antenna. Radiation parameters of new I-IDH antennas of Eplane
sectoral, H-plane sectoral and pyramidal types were studied and are found to be
very attractive. Theoretical approach based on Marcatili’s principle and two aperture
theory along with diffraction theory and image theory is used to support the experimental
findings. The HDH is considered as solid horn of effective dielectric constant and the
aperture field is evaluated. The antenna is excited by the open waveguide in the dominant
TE1o mode and so the existence of any hybrid mode is mled-out. The theoretical results
are observed to be in good agreement with the experimental results.
Description:
Department of Electronics, Cochin University of Science and Technology