Circular-polarization antenna

摘要

The invention provides a low-profile circular-polarization antenna (1) that can be implemented at a reduced mounting cost of components. Two linear-polarization surface-mount antennas (3, 4) are mounted on a mounting substrate (2) such that their planes of polarization are perpendicular to each other in the direction normal to the mounting surface, and an amplification circuit, a shield case (5) for covering the circuit, and a phase circuit (6) for sending signals having the same amplitude and a phase difference of 90 degrees to the two surface-mount antennas (3, 4) are provided on the same mounting surface. <IMAGE>