In this letter, a novel fractal tree shaped two‐element dielectric resonator antenna (DRA) design for wideband multiple input multiple output (MIMO) applications is proposed. Fractal tree shaped geometry is proposed to achieve wideband characteristics while a C‐shaped periodic defected ground plane structure (PDGS) is used to achieve reduction in mutual coupling between two closely spaced antenna elements. Extensive parametric study is carried out to obtain desired mutual coupling reduction without much affecting the bandwidth of the DRA array. The proposed antenna was fabricated and its performance was tested. Measured impedance bandwidth of around 89.9% (–10 dB as reference) is achieved over a frequency band of 3.95–10.4 GHz. Measured mutual coupling less than −15 dB is obtained over the entire band of interest. Both the measured results are quite in accordance to the simulated results. The antenna design parameters, its associated results and parametric study of antenna parameters are discussed in the paper.

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In this letter, a stacked triangular prism shaped dielectric resonator antenna (DRA) is proposed for ultrawideband (UWB) applications. A combination of three techniques namely, stacking of DRAs, introduction of triangular shaped conformal patch loop excited by coaxial feed, and fractal geometries are utilized on triangular prism shaped DRA to achieve UWB. Improvement in bandwidth (BW) is achieved by introduction of triangular shaped fractal slots and by sandwiching low permittivity DR material is sandwiched between two high permittivity DR materials. Finally, by introduction of triangular loop shaped conformal patch, UWB is achieved. The proposed antenna is fabricated and measured impedance BW of about 120.9% covering frequency range from 3.3 to 13.4 GHz (C‐ and X‐band) is achieved. 98.8% radiation efficiency and average gain of 7 dBi has been achieved over the entire frequency band of interest. Discussions on various design parameters and its associated results are included in this letter.

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Abstract-In this paper, a fractal tetrahedron shaped dielectric resonator antenna (DRA) design for wideband applications is proposed. Two triangular-shaped fractal slots of different sizes are introduced to reduce Q-factor of DRA and in turn to achieve wide bandwidth (BW). Internal coaxial feeding is utilized for good impedance matching and ease of fabrication. The proposed fractal DRA is fabricated and tested. The measured results are in good agreement with the simulated ones. Measured impedance bandwidth of about 72.3% covering frequency band of 3.8-8.1 GHz is achieved. Good separation between co-and cross-polarized radiation patterns in the broadside direction is achieved. Various design parameters and associated results are discussed in this paper.