A Novel Design of Dual-Band Circularly Polarized Antenna Based on Patches Having Rotation Angles

Abstract

Abstract-In this paper, a dual-band circularly polarized (CP) patch antenna with left-hand circular polarization (LHCP) in the lower band and right-hand circular polarization (RHCP) in the higher band is proposed. On the basis of aperture coupled feed, the dual-band circular polarizations are achieved by adopting two rectangular patches with different rotation angles on the front and back of a substrate. A good agreement between the simulated and measured results is obtained. The 10-dB impedance bandwidths and 3 dB Axial Ratio (AR) bandwidths are 18.4% (1.93-2.32 GHz) and 3.2% (2.14-2.21 GHz) in the lower band and 12.4% (2.58-2.92 GHz) and 1.7% (2.84-2.89 GHz) in the higher band, respectively. The proposed antenna with its simple structure, compact size and excellent performance provides a reference for communication system applications.

CPW-Fed Dual-Band Dual-Sense Circularly Polarized Antenna for Wimax Application

“…1. The antenna has overall dimensions of 50 × 50 × 1.58 mm 3 . Initially the antenna is designed for dual-band application with linear polarization (LP), as shown in Fig.…”

“…However, limitation of AR bandwidth is the immense drawback, which leads to the restriction of broadband CP antenna applications. Multiband CP antenna can be realized by rotating two rectangular patches [3], placing a T-shaped stub with two spiral slots or an asymmetric feed line in a square slot ground plane [4][5][6], implementing a crane-shaped grounded stub with two parallel monopoles or a Cshaped grounded strip with slots loaded in a square slot ground plane [7,8], stacking two different corner truncated patches [9], exciting a spiral, annular ring slot or two circular eccentric rings [10][11][12][13], implementing four T-shaped elements or slits into the edge of the square slot [14], perturbing the patch with modified ground plane [15,16], using a tilted-D shaped or grounded stub loaded monopole antenna [17][18][19]. However, design of wider ARBW for a dual-band dual-sense CP antenna is still a big challenge for researchers.…”