Wideband circularly polarized antenna for dual‐band operation

Abstract

In this paper, we propose a wideband antenna with circular polarization (CP) characteristics in two different bands. The proposed antenna consists of two radiator elements on the top layer of the substrate and a feeding structure on the bottom layer of the substrate. A square wide slot with 45 rotation achieves low resonant frequency. High resonant frequency is formed by a square patch implemented in a square slot. To obtain CP characteristics in the low-frequency band, a pair of opposite edges of the ground plane/substrate is cut off. By applying a pair of slits to the diagonal part of the patch antenna, good CP performance can be obtained in the high-frequency band. The measured 3-dB axial ratio (AR) bandwidths are 11% and 10.4% in two different bands, respectively. Right-handed CP (RHCP) characteristics are exhibited in both bands; these measurements are congruent with the simulated data.

A wide circularly polarized dual‐band isosceles trapezoidal monopole antenna with modified ground plane

“…But single‐feed CP antenna has a constraint of narrow 3‐dB axial ratio BW. Various single‐fed monopole CP antennas with different configuration have been designed in the recent few years 8–14 …”

“…Various single-fed monopole CP antennas with different configuration have been designed in the recent few years. [8][9][10][11][12][13][14] In this paper, an isosceles trapezoidal monopole antenna (ITMA) with dual broadband characteristics of impedance bandwidth (IBW) and a single wideband axial ratio bandwidth (AR BW) is proposed. The antenna is designed on a single layer, single microstrip line feed configuration, and low-cost substrate (FR4).…”