الفهرس 
Electromagnetic band gap materialsOnly 14 pages are availabe for public view
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Abstract
Polarization converters find wide applications in communications and radar.
Conventional polarization converters suffer from heavy weight, complicated
structure, losses, and / or narrow bandwidth. Polarization converters based upon
electromagnetic band gap materials are low profile, light weight, efficient, and
have large bandwidth.
This thesis is concerned with millimeter wave polarization converters made of
mushroom-like electromagnetic band gap materials. A simple procedure for the
design of these converters is developed. One of the polarization converters
designed transform linear polarization to another linear but the electric field is
perpendicular to the incident field. Other polarization converters transform
linear polarization to right-handed circular or left-handed circular. Different
structures for polarization converters are designed. These structures are: (1)
rectangular patch, (2) square patch with single slot, (3) square patch with two
slots, (4) square patch with offset via, (5) uni-planar compact structure, and (6)
slotted ring structure.
Reconfigurable polarization converter with varactor diodes is designed to
transform linear polarization to linear perpendicular or right-handed circular
according to the values of the varactors.
Reconfigurable polarization converter with square patch and three offset vias
connected to switches is designed. The converter transforms linear polarization
to linear perpendicular, left-handed circular, or right-handed circular according
to thevia chosen.
All simulations are carried out using the software packages HFSS and CST.