Abstract
A compact circularly polarized printed slot antenna operating at 2.45 GHz is reported. The antenna consists of a pair of rotated square split ring resonators (SRR) inside a rectangular slot etched on the ground plane of an FR-4 dielectric substrate. A microstrip open-loop feed is etched on the backside of the dielectric substrate to feed the slot and the split ring resonators. The overall size of the antenna is 60x42x1.6 mm3. The measured -10dB impedance bandwidth is 10.48% (2.38-2.64 GHz) and the measured 3dB axial ratio (AR) bandwidth covers the entire impedance bandwidth.
Highlights
Rapid progress in wireless communication technology has demanded the need for developments in antenna designs
The prototype of the proposed slot antenna with optimal geometrical parameters was fabricated and the radiation characteristics were measured in an anechoic chamber
By the introduction of this feeding mechanism, the two split ring resonators (SRR) are excited with 900 phase (a) differences which satisfies the condition for circular polarization
Summary
Rapid progress in wireless communication technology has demanded the need for developments in antenna designs. Since the printed slot antenna is a dual form of the microstrip antenna, it is possible to produce circularly polarized (CP) radiation by introducing some symmetrical or asymmetrical perturbation elements to the slot antenna. The antenna can radiate a CP wave by generating two orthogonal degenerated modes using perturbation cuts or strips These antennas exhibit small impedance and narrow axial ratio (AR) bandwidths. A solution to this problem is introduced in the proposed paper where the split ring resonators inside the slot antenna are rotated and fed by a microstrip open-loop feed. The antenna is designed to operate at 2.45GHz which can be used as RFID reader antennas and in WLAN systems This new design offers enhancement in the axial ratio bandwidth which covers the entire impedance bandwidth
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