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The dielectric metamaterial lens antenna for wide angle beam scanning is discussed as an applicative antenna. The availability of the low-loss structure using dielectric resonator and the cause of the reduction of the antenna efficiency are clarified by the electromagnetic simulations. The validation of the design of the metamaterial lens antenna is clarified through the experiment.
In this paper, the NRI lens antenna using dielectric resonators for wide angle beam scanning is presented. The constant beam scanning characteristics of the NRI lens antenna is confirmed. And the reduction of the antenna efficiency is due to the dielectric loss of the parallel plate waveguide and the staircase approximation of the lens shape.
The practical array feed is achieved through developing the array element and the power divider. Important technical results developed are summarized as follows. (1) As array element antenna, the convenient patch antenna configuration is developed. (2) For the 30deg beam scanning, the 8 branch power divider is fabricated. Accurate excitation coefficients are ensured through the measured results. (3)...
In order to increase beam shapes and antenna gains, patch array feed for the shaped dielectric lens antenna is developed. Important technical progresses are summarized in the following. The array element patch antenna that has the similar radiation patterns as a rectangular horn is developed. Excitation coefficient of the patch array feed is obtained through the radiation pattern synthesis method...
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...
NaxNd(2-x)/3TiO3 solid solutions possess tetragonal or orthorhombic perovskite structure, where the A-sites are characterized by 2 kinds of cations (Na+, Nd3+) and vacancies. We have measured microwave dielectric properties of NaxNd(2-x)/3TiO3 solid solutions (x = 0.05 to 0.5) to investigate an effect of the compositional ordering in the A-sites of the perovskite structure. According to powder X-ray...
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