Circularly Polarized Antennas And Wearable Devices
Circularly Polarized Antennas And Wearable Devices
Provided are a circularly polarized antenna and a wearable device. The circularly polarized antenna includes a circuit board, an annular radiator arranged at a distance from the circuit board, and a coupling excitation unit, where the coupling excitation unit is arranged in proximity to the annular radiator and electromagnetically coupled to the annular radiator. The coupling excitation unit includes a first coupling branch and a first tuning element, a first end of the first coupling branch being electrically connected to a feeding portion of the circuit board, and a second end of the first coupling branch being electrically connected to a reference ground of the circuit board via the first tuning element. An annular current loop is formed between the coupling excitation unit and the circuit board.