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In this paper, the behavior of the impedance bandwidth, SAR and radiation efficiency of mobile terminal antennas are studied by FDTD-based simulations at a wide frequency range, from 0.6 GHz to 6 GHz. The used models comprise a basic coupling element based antenna structure placed beside a simple dielectric block modeling the user. The results of this paper give novel information about the behavior...
Performance enhancement of small conformal antennas, e.g., microstrip patch antennas (MPA's) is often accomplished by adding a superstrate or a substrate, comprising of artificial dielectrics that are also referred to as metamaterials, especially when the effective parameters differ substantially from those of the constituent media. These embellishments to the MPA are designed to increase its effective...
In this paper, the broadside coupling between zeroth order resonator mushroom structures have been clarified. The dominant factor of the insertion loss was dielectric loss when the dielectric loss tangent is nonzero. The low insertion loss was realized in the offset arrangement including the coupling between the microstrip line and the mushroom structure. The broadside coupling characteristics between...
0.95MgTiO3-0.05CaTiO3 high-permittivity ceramic have been applied in the fabrication of dielectric resonator antenna. The permittivity and quality factor of 0.95MgTiO3-0.05CaTiO3 have been characterized. The dielectric resonator antenna is fed with a mico-strip line. Fabricated dielectric resonator antenna was measured by an Agilent N5230A network analyzer. The measurement result of the antenna composed...
In order to mitigate the problem of unwanted reflections from a homogeneous dielectric lens, a lens based on periodic networks of transmission lines is proposed. Since the propagation constant and the impedance of the network can be varied to a large extent independently from each other, it is possible to realize a lens with a high index of refraction while having almost perfect impedance matching...
This report presents the power pattern calculated by HFSS for the RF-microwave transmitted from a low profile inexpensive small patch antenna and scattered by a spherical object embedded within the confines of cuboid dissipative medium. The localization of the object causes the alteration of the radiation power pattern as well as the efficiency of the antenna. The calculation results indicate a patch...
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