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

Abstract

This 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 (ε rdr = 9.8, 14 × 12 × 8 mm 3 ) made from alumina (Al 2 O 3 ) 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 (ε r = 4.4), fed with a 50-Ω microstrip feed line, and has a compact size of 38 × 38 × 9 mm 3 . 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 S 11 < − 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.

A dielectric‐loaded broadband single‐ and dual‐polarized slot antenna with low profile and low cross‐polarization

“…What the dielectric-loaded slot antenna proposed in this paper consists of three layers, respectively, feeding network, low permittivity substrate and high permittivity substrate. Embedding dielectric substrate of low permittivity below high permittivity substrate has been theoretically [32][33][34][35][36][37][38][39][40] and experimentally [6][7][8][9][10][11] proved to be an effective method to achieve broadband impedance match, which can be figuratively understood that it aims to bridge the gap between the effective permittivity of the whole DRA and air region. Undoubtedly, it is a proven approach to achieve simultaneously low profile and broadband for DRA [6][7][8][9][10][11] and DD patches antenna.…”

A Compact Sierpinski Gasket Fractal Antenna for S, C, X, and Ku Band Applications

“…antenna's resonance is adjusted and customized by choosing an appropriate fractal design [10]. The proposed design incorporates a Sierpinski gasket pattern into an octagonal-shaped printed monopole, leading to a smaller cross-sectional area for the radiator while achieving a wide resonance with increased gain [11]. In the proposed design, an electric field is channeled into the printed monopole through the utilization of a partial ground, and a lumped port is utilized to enable the transfer of electromagnetic fields between the radiator and the ground [12].…”