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

Abstract

This paper presents a CPW-fed dual-band dual-sense circularly polarized square slot antenna (CPSSA). The antenna consists of a rectangular radiator with two unequal rectangular strips, connected by a CPW feed line. An inverted L-shaped grounded stub is placed in the right side of the slotted ground plane with the orthogonal direction of the feed line to create CP modes. The proposed antenna obtained two CP bandwidths of 3.30-3.78 GHz and 5.4-5.86 GHz with axial ratio (AR) value less than 3 dB, and both the CP bands are overlapped by impedance bandwidth (IBW) of the antenna, ranging from 2.72 to 7.34 GHz. Total size of the proposed antenna is 50× 50× 1.58 mm 3. The antenna is fabricated on an FR4-epoxy substrate and measured. Simulation results are verified by measurement for the given antenna. The designed antenna is well used for WiMAX (3.5 GHz and 5.5 GHz) band with CP characteristics. Design procedures of the antenna are discussed in details for further understanding of the antenna design. Parametric study has been done for describing the mechanism of the dual-band CP with the analysis of electric current distribution of the antenna. Meanwhile, wide axial ratio bandwidth has been obtained in both the bands using this structure compared to other published structures.

Triple Band Dual Sense Circularly Polarized Slot Antenna for S and C Band Applications

“…In [7], a slot antenna loaded with metallic strips, and a split-ring resonator (SRR) is proposed in which the CP bands are generated when the SRR and copper strips are excited by the microstrip feed. The coplanar waveguide (CPW)-fed antenna structure is proposed in [8] and [9]. In [8], a rectangular patch with two unequal rectangular strips is connected by a CPW feedline, and an inverted L-shaped stub is placed in the ground plane to create CP modes.…”

“…The coplanar waveguide (CPW)-fed antenna structure is proposed in [8] and [9]. In [8], a rectangular patch with two unequal rectangular strips is connected by a CPW feedline, and an inverted L-shaped stub is placed in the ground plane to create CP modes. In [10], an antenna is designed in which a U-shaped radiator, rotated by 45 • , is placed at the top in which an I-shaped strip is connected, and then an inverted L-shaped strip is connected to the end of the I-shaped strip in order to generate different CP modes.…”