Antenna

A method for an antenna having first to Nth antenna elements, where N is an integer that is four or more, the method comprising:

• controlling input of signals to each of the first to Nth antenna elements,
• wherein, among the first to Nth antenna elements, open ends of the second to Nth antenna elements extend in directions substantially 360/N degrees different from a direction in which the first antenna element extends,
• wherein, among signals input to the first to Nth antenna elements, signals input to the second to Nth antenna elements have phases that are substantially 360/N degrees different from a phase of a signal input to the first antenna element, and
• wherein controlling input of signals includes controlling a state to be a first state or a second state, wherein the first state is a state in which signals are input to the first to Nth antenna elements to radiate a circularly polarized wave in a first direction, and the second state is a state in which signals are input to one or more of the first to Nth antenna elements to radiate a linearly polarized wave in a direction different from the first direction.

A non-transitory computer-readable storage medium storing a program to cause a computer to perform a method for an antenna having first to Nth antenna elements, where N is an integer that is four or more, the method comprising:

• controlling input of signals to each of the first to Nth antenna elements,
• wherein, among the first to Nth antenna elements, open ends of the second to Nth antenna elements extend in directions substantially 360/N degrees different from a direction in which the first antenna element extends,
• wherein, among signals input to the first to Nth antenna elements, signals input to the second to Nth antenna elements have phases that are substantially 360/N degrees different from a phase of a signal input to the first antenna element, and
• wherein controlling input of signals includes controlling a state to be a first state or a second state, wherein the first state is a state in which signals are input to the first to Nth antenna elements to radiate a circularly polarized wave in a first direction, and the second state is a state in which signals are input to one or more of the first to Nth antenna elements to radiate a linearly polarized wave in a direction different from the first direction.