Wide bandwidth left-handed circularly polarized printed antenna with crescent slot

Investigation of a wide bandwidth left-handed circularly polarized printed antenna with crescent slot is presented in this paper. The antenna is proposed to be applied for telemetry communication of GAIA II/LAPAN-Chiba satellite. Here, the satellite is categorized as 100kg class satellite including payload and featured with an L-band circularly polarized synthetic aperture radar (SAR) system. The proposed antenna is designed on an NCP220H dielectric substrate with the relative permittivity of 2.17 and the thickness of 1.6mm. The bottom side of antenna acts as feeding line and port excitation, meanwhile the front side is set as groundplane. Furthermore, at the groundplane side it is also set a square parasitic patch as radiator element. From the characterization result, the antenna could produce fractional bandwidth of -10 dB reflection coefficient (S
₁₁
) up to 101% (1.3 GHz-3.58 GHz) at the center frequency of 2.25 GHz and -3 dB bandwidth of axial ratio up to 13.7% (2.14 GHz-2.45 GHz). In addition, the gain of proposed antenna is about 5.6 dB at the center frequency.