US Patent 10218426 Antenna device, wireless communication device and signal transmission method

According to one embodiment, an antenna device includes a branch circuit, a first phase shifter, a second phase shifter and a radiating element. The branch circuit divides an input signal and generates a first signal and a second signal. The first phase shifter is capable of shifting a phase of the first signal. The second phase shifter is capable of shifting a phase of the second signal. The radiating element transmits a right-hand circularly polarized wave based on a first output signal of the first phase shifter and transmits a left-hand circularly polarized wave based on a second output signal of the second phase shifter.