Abstract
Conical and cylindrical dielectric resonator elements are vertically stacked and excited by a simple coaxial monopole. Compared to all earlier configurations, the proposed geometry significantly improves the impedance bandwidth. The ultrawideband response is enhanced due to the multiple resonances occurring by the suggested hybrid antenna. The footprint area of the antenna is only 63.6 mm2 or 25.44 x10-3λo 2 at the lowest operating frequency. The performance of the antenna is verified experimentally and numerically. Presented results show that the proposed hybrid monopole-DRA has a measured impedance bandwidth up to 148.6% (S11 < -10 dB) along with consistent monopole-like radiation patterns and peak gain of 7.14 dBi. With such properties, the proposed hybrid monopole-DRA can be used in different ultra-wideband wireless applications and as wideband electromagnetic interference (EMI) sensors.
Highlights
Different basic dielectric resonator antennas (DRAs) are reported in the literature such as hemispherical, cylindrical, and rectangular DRAs [1,2,3]
In [4], the central portion of the rectangular DRA is removed which enhanced the bandwidth up to 28%. Another method to improve the bandwidth is to modify the geometry of the DRA to get different shapes such as a split cylinder [5], conical DRA [6], a tetrahedron and triangular [7], truncated tetrahedron [8]
The largest bandwidth reported so far is 72% using U-shaped DRA covering frequency ranges from 3.87 to 8.17 GHz [9]. Another approach is investigated by using hybrid DRAs
Summary
Different basic dielectric resonator antennas (DRAs) are reported in the literature such as hemispherical, cylindrical, and rectangular DRAs [1,2,3]. These modified geometries have more degree of freedom for the design parameters than all basic DRAs geometries By using this approach, the largest bandwidth reported so far is 72% using U-shaped DRA covering frequency ranges from 3.87 to 8.17 GHz [9]. The largest bandwidth reported so far is 72% using U-shaped DRA covering frequency ranges from 3.87 to 8.17 GHz [9] Another approach is investigated by using hybrid DRAs. In a hybrid DRA, combination of a DRA with other resonators such as microstrip patch, quarter wave monopole MP, or a slot radiator is used to improve the impedance bandwidth. The simulated results are compared with the measured ones of the fabricated antenna loaded with lossy DRs, and a good agreement is revealed
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