Patent ID: 7542007

Claim:
An antenna comprising: an unbalanced power feeder line; first and second antenna elements; and an unbalanced/balanced converter which includes an input port and first and second output ports, the unbalanced power feeder line being connected to the input port, the first and second antenna elements being connected the first and second output ports, respectively, the unbalanced/balanced converter having a first filter circuit provided between the input port and the first output port and a second filter circuit provided between the input port and the second output port, the first filter circuit rejecting frequencies within a first frequency range, the first and second filter circuits passing frequencies within a second frequency range different from the first frequency range, in response to a signal, inputted to the input port, which falls within the second frequency range, the first and second filter circuits outputting signals that are inverted in phase and equal in amplitude with respect to each other.