Wideband circularly polarized Spidron fractal slot antenna with a grooved dielectric resonator

Abstract

A single-feed wideband circularly polarized Spidron fractal slot antenna with a grooved dielectric resonator is presented. To realize a wideband axial ratio, the circular polarizations of both a Spidron fractal slot and a grooved rectangular dielectric resonator are merged. The proposed antenna is excited by a simple 50-Ω microstrip feed line which is located underneath the Spidron fractal slot. A prototype of the proposed antenna is fabricated and tested. The measured −10 dB reflection coefficient bandwidth and 3 dB axial ratio bandwidth are 40.33% (1.94-2.92 GHz) and 23.75% (2.30-2.92 GHz), respectively. The measured peak gain of the antenna is 4.23 dBic.

A Wideband Circularly Polarized Antenna with a Multiple-Circular-Sector Dielectric Resonator

“…In order to evaluate the performance of the antenna, a comparison of the proposed antenna and antennas presented in earlier works [11,12,13,14,15] was performed. These results are illustrated in Table 2.…”

“…Compared to LP antennas, CP antennas are more feasible, because they can reduce the losses caused by propagation effects and misalignment between the transmitting and receiving antennas [9]. Thus, the designs of CP DRAs have received much attention recently [10,11,12,13,14,15,16]. The technique for realizing circular polarization through a DRA mostly requires either modifying the excitation mechanism or using a specially-shaped dielectric resonator (DR).…”

“…Meanwhile, designs of CP DRAs with specially-shaped DRs fed by the aperture-coupled feeding technique were also investigated. In one such study [13], an AR bandwidth of 11.57% was achieved using a Spidron fractal-shaped DR. A CP DRA with a grooved rectangular DR was also presented, reportedly showing an AR bandwidth of 23.75% [14]. Pan et al introduced a trapezoidal DRA [15] which offered an AR bandwidth of 21.5%.…”

3D-Printed Super-Wideband Spidron Fractal Cube Antenna with Laminated Copper

“…According to the exponential function, the widths of the ends of the balun (w 0 , w 1 and w 2 ) are optimized smoothly to transform the impedance from 145-Ω to 50-Ω in broadband. The exponential function can be expressed as [13]: …”

“…Previously, we introduced two-dimensional Spidron fractal configurations for various antenna applications-specifically, a Spidron fractal slot antenna with a grooved dielectric resonator [13] and a uniplanar electromagnetic bandgap employing a modified Spidron fractal geometry [14]. In the present paper, a novel 3D-printed SWB cube antenna with a Spidron fractal configuration is proposed.…”