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This letter is devoted to a circularly polarized (CP) low-profile antenna radiating parallel to its ground plane. The proposed antenna has a capacitive feeding structure resulting in a small dimension of 0.127λ0 × 0.059λ0 and the short height of 0.01λ0 at 1.77GHz, where λ0 is the wavelength at the resonant frequency. Even though the structure is low-profile, the radiation efficiency can reach at 70% (Simulated) with a small gap. The proposed antenna can radiate LHCP (Left-hand CP) and RHCP (Right-hand CP) in the opposite directions parallel to the ground plane.

Low-profile helical-like antenna for radiating circular polarization parallel to ground plane