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Slot antennas on dielectric-coated perfectly conducting objects have extensively been studied by many investigators. For these problems, exact analytic solutions are available only for a limited number of geometries. These geometries include circular and elliptic cylinders, as well as, spheres and spheroids. Since these solutions maintain mathematical rigor, they provide not only exact solutions for...
The characteristics of a prolate spheroidal antenna, excited by a rotationally symmetric narrow slot, have been discussed by Wait [1]. Sinha and MacPhie[2] have discussed the admittance characteristics of an antenna system consisting of two symmetrically center-fed prolate spheroids in parallel configuration. Ciric and Cooray[3] have further investigated such two spheroidal dipole antennas in an arbitrary...
High frequency systems and techniques are becoming more and more common among the scientific community, like medical and diagnosis applications, military devices, and civil communications. These systems use to rely on slot-array antennas due to their properties of low loss and high gain. Even though this document continues a study specially focused on compound slot antennas, it shows arrays of different...
A dual-polarized ceiling-mounted antenna, based on previous ceiling-mounted antennas is proposed in this letter. It consists of one vertical polarization unit and one horizontal polarization unit. The vertical polarization unit is a transformation of a monopole, looking like a tundish. And the horizontal polarization unit comprises of four dipoles on a substrate ring. The two units compose a nesting...
A simple compact dual-band dipole (48 mm × 12 mm × 0.8 mm) with shorting pins and slots is presented in this paper. The shorting pins helps to realize a compact dipole. The slots are composed of H-shape slots and comb-shape slots. The former is of help to expansion of the impedance band, and the latter to further compactness of the dipole. Its operating bandwidth is 600 MHz in the lower band and 270...
A compact ultra-wideband microstrip-fed planar antenna with dual band-notch characteristic is presented. Two notched frequency bands are achieved by embedding an E-slot in the radiation patch and a U-slot defected ground structure in the feeding line. Moreover, the two notched bands can be controlled by adjusting the length of the corresponding slot. Experimental results show that the proposed antenna,...
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