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Antennas with dual linear slant polarization over a wide band are necessary for modern personal communication base-station applications. A plusmn45deg polarization diversity antenna element constructed by novel umbrella-shaped dipoles is presented in this paper. The antenna has a half-power beam width of 63deg plusmn5deg in the horizontal plane by designing(More)
A state-of-the-art review of the behavior of interfaces between granular materials and solid structural components is presented. The review includes both the experimental and theoretical researches on the interfaces between soils and steel, as well as those between soils and concrete. Development of constitutive relations of such interfaces is also(More)
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