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Dual-band dual-sense circularly polarized antenna for S- and C-band applications


Huy Hung Tran, Tuan Tu Le, Truong Khang Nguyen

Source title: 
Microwave and Optical Technology Letters, 61(1): 141-146, 2018 (ISI)
Academic year of acceptance: 

This paper presents a dual‐band dual‐sense circularly polarized (CP) antenna for S‐ and C‐band applications. A semicircular patch and a circular slot are first designed to achieve wide operation bandwidth in the C‐band with right‐hand CP (RHCP), and then, a curved slot is properly inserted around the circular slot for S‐band realization with left‐hand CP (LHCP). Final antenna prototype has an overall size of 3.png, where 4.pngis free‐space wavelength at the lowest CP frequency. Experimental results show that good CP characteristics for both RHCP and LHCP can be achieved. The measured −10 dB impedance bandwidth is from 2.2 to 6.5 GHz, equivalent to about 98.8%. Additionally, the measured 3 dB axial‐ratio bandwidths for lower and upper bands are, respectively, 4.9% (2.4‐2.52 GHz) and 40.8% (4.0‐6.05 GHz).