We present a small compact crossed-dipole antenna comprising two printed folded crossed-dipole arms and a pair of vacant quarter printed rings to generate circular polarization (CP). The design of a compact, small-sized CP antenna is realized by rotating the arms of a conventional crossed dipole and then folding the rotated arms twice into a figure-eight-like structure. By undertaking these rotation and folding techniques, we achieve a miniaturized CP crosseddipole antenna that performs satisfactorily. The compact crossed-dipole folded antenna with overall dimensions of 22.3 mm×39.9 mm×0.508 mm (0.22 λ0 × 0.39 λ0 × 0.0052 λ0 at 3.07. GHz) has a measured S11| <-10 dB impedance bandwidth of 2.81-3.51 GHz (22.15%) and a simulated 3-dB axial bandwidth of 2.85-3.30 GHz (14.63%).
ACKNOWLEDGMENT This work was supported in part by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (No. 2018R1D1A1A02086071) and in part by \u201cHuman Resources Program in Energy Technology\u201d of the Korea Institute of Energy Technology Evaluation and Planning (KETEP), granted financial resource from the Ministry of Trade Industry & Energy, Republic of Korea (Project No: 20184030292220).
