Circularly polarized rectangular slot antenna with trapezoidal tuning stub for UWB application

Planar microstrip‐fed broadband circularly polarized antenna for UWB applications

“…The measured peak gain is shown in Figure and is almost stable with respect to frequency. Table represents the comparison of the proposed broadband CP antenna with the other antennas reported in the literature. From the table, it can be noted that the proposed antenna has a wider ARBW with a compact size that makes it more useful in the indoor wireless applications.…”

“…By providing the perturbations over the slot aperture arms of Ant4, an improvement in AR over a wide bandwidth can be obtained . Here, the perturbations are introduced across the arms of the hexagonal slot in serial manner, i.e.…”

“…However, the antennas like spiral and helical antennas are very popular for their wide ARBW, but are less preferred because of their large size. Many researchers have used slot antennas with embedded slot asymmetry and/or feed asymmetry for the design of CP antennas with wide ARBW. The introduced asymmetry regulates the magnitude and phase of the orthogonal E‐field components, which effects value of axial ratio (AR) and that leads to CP radiations.…”

“…whether the radiations are right hand circularly polarized (RHCP) or left hand circularly polarized (LHCP). The asymmetrical slot based wideband antennas are presented in . CP antennas with equiangular spiral arm (ESA) shaped feeds are reported in , which use the inherent wideband matching properties of spirals.…”