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2024-10-28
Small Size Radially Embedded Probe-Fed Dielectric Resonator Antenna for Ultra-Wideband Applications
By
Progress In Electromagnetics Research C, Vol. 149, 87-94, 2024
Abstract
Radially embedded probe-fed circular disc dielectric resonator antenna (DRA) for ultrawideband applications is investigated. Initially, a single-layer probe fed DRA is developed. The probe length is adjusted to optimize S11 performance. For a probe length of 10 mm, a measured -10 dB bandwidth of 47.8% (4.75-7.74 GHz) is obtained. The design is modified with two concentric rings of different dielectric materials with a hollow center. The modified configuration improves the matching from an S11 value of -18 dB at 5.23 GHz to -24.2 dB at 4.56 GHz. However, the measured -10 dB bandwidth reduces to some extent to 38.4% (4.2-6.2 GHz). In another modified design, an air gap is introduced between two inner discs of Alumina supported by a solid outer ring of Teflon. The radially embedded feeding probe, therefore, protrudes into the circular air pocket sandwiched between the two Alumina discs. An improved measured bandwidth of 55.9% (6.66-11.83 GHz) is obtained. Measured S11 of -24.1 dB is similar to that obtained for the concentric ring design but at a higher frequency of 9 GHz. All the three antenna designs feature a reduced size having a volume of approximately 1963.5 mm3, wider bandwidth and consistent radiation pattern over the operating frequency band. It makes the proposed designs suitable for ultra-wideband (UWB) applications.
Citation
Abinash Thakur, and Satyajib Bhattacharyya, "Small Size Radially Embedded Probe-Fed Dielectric Resonator Antenna for Ultra-Wideband Applications," Progress In Electromagnetics Research C, Vol. 149, 87-94, 2024.
doi:10.2528/PIERC24092503
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