Inverted Sierpinski Carpet fractal‐inspired dielectric resonator antenna for wideband applications

Abstract

AbstractThis communication explains a novel approach for attaining wideband inverted Sierpinski Carpet fractal geometry with a rectangular shape dielectric resonator antenna (DRA). Dielectric Resonators (DRs) have advantages, like, high gain, efficiency, wide bandwidth, low conduction loss, and minimum surface waves. Rectangular shape DR (εrdr = 9.8, 14 × 12 × 8 mm3) made from alumina (Al2O3) is mounted on top of a primary square patch. Inverted Sierpinski fractal geometry provides the benefit to decrease the volume to the surface area without removing elements from the patch. The proposed fractal DRA is printed on an FR4 substrate (εr = 4.4), fed with a 50‐Ω microstrip feed line, and has a compact size of 38 × 38 × 9 mm3. At the backside of the antenna, an extended stub from the partial ground plane enhances impedance matching from 4 to 5 GHz. The prototype of the proposed DRA is fabricated and measured. The antenna functions with an impedance bandwidth of 98.84% for S11 < − 10 dB, covering 3.5–10.34 GHz of the ultrawideband range. The proposed DRA offers a stable omnidirectional radiation pattern, maximum measured gain of 7.01 dBi, and has an average efficiency above 97% over the region of operation. These features make the proposed DRA applicable for cellular communication repeaters, local area networks, and vehicular communication applications.