Abstract
In this communication, the circularly polarized properties of 4x4 element planar microstrip equilateral triangular array antenna (METAA) printed on Yttrium ferrite substrate are presented. Two hands of circular polarization are generated when the magnetic bias is applied parallel to the wave propagation in the antenna geometry. The values of antenna parameters of array geometry as radiation conductance, radiation efficiency and bandwidth are investigated for biased and unbiased case. The analysis is based on cavity model.
Highlights
One of the most important applications microstrip antennas is generation of circular polarization, which is widely required for many satellite and radar communication systems
Single feed microstrip antennas for circular polarization are usually achieved by truncating patch corners of square patch, using nearly square or nearly circular patches, inserting a pair of symmetric perturbation elements at a boundary of a circular patch (Roy & Vandon, 1992; Chen & Wong, 1999; Haung, 1999; Iwasaki & Chiva, 1999)
For circular polarization on ferrites, the degenerate orthogonal modes are generated with an application of a dc magnetic bias field normal to the ferrite and patch
Summary
Introduction One of the most important applications microstrip antennas is generation of circular polarization, which is widely required for many satellite and radar communication systems. This circular polarization is obtained when two orthogonal modes are excited with equal amplitude and in phase quadrature. For circular polarization on ferrites, the degenerate orthogonal modes are generated with an application of a dc magnetic bias field normal to the ferrite and patch.
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