| Title |
Circularly Polarized Hybrid Slot/ring Antenna for Dual-band Operation |
| DOI |
https://doi.org/10.5573/ieie.2023.60.1.12 |
| Keywords |
Circular polarized antenna; Hybrid antenna; Slot/ring antenna; Dual-band antenna |
| Abstract |
A dual-band circularly polarized (CP) hybrid antenna, realized by combining two different types of radiators?slot and ring resonators?is proposed in this paper. The first resonant frequency f1 (Model A: 1.96 GHz, Model B: 2.58 GHz) is generated by the square slot resonator in the hexagonal patch, and the second resonant frequency f2 (Model A: 3.74 GHz, Model B: 4.09 GHz) is formed by the square ring resonator. An asymmetric structure is obtained by cutting a pair of diagonal corners of the proposed antenna to produce CP characteristics at f1. CP performance at f2 is achieved by introducing a gap in the ring. The hexagonal patch with a slot works as a resonator at f1 and GND at f2. In this study, two types of antennas are designed. In the first model, the ring resonator is placed on the same layer with the feeding structure, and in the second model, the ring resonator is placed on the same layer with the hexagonal patch. Since f1 and f2 are formed by separate resonators, they can be adjusted independently. For the first model, the measured 3 dB bandwidths are 9.2% and 5.1%. On the other hand, for the second model, the measured 3 dB bandwidths are 10.4% and 7.5%. |