Patent ID: 6426730
Filing Date: 2002-07-30
Classification: H01Q

Abstract:
A multi-frequency array antenna comprising:a ground conductor having at least one of a flat surface and a curved surface; a plurality of linear-shape antennas, each linear-shape antenna mounted on said ground conductor and configured to operate at an operating frequency; feeders configured to feed said plurality of linear-shape antennas; an array formed by combining the plurality of linear-shape antennas into a plurality of linear-shape antenna groups, said groups configured to operate at least at two frequencies; and cranks formed on antenna elements of a lower-frequency set of the linear-shape antennas, said lower-frequency set configured to operate at a lower frequency than a maximum frequency among a plurality of operating frequencies of the linear-shape antennas, said cranks are configured to suppress excitation current induced on said lower-frequency set by radiation from a higher-frequency set of linear-shape antennas radiating at frequencies higher than said lower frequency.