Patent ID: 7633458
Filing Date: 2009-12-15
Classification: H01Q

Abstract:
1. An antenna device, comprising: a first slot element and a second slot element arranged on a conductor plate in parallel and at a predetermined spacing and each having an electrical length of about one half wavelength; a reflecting plate arranged at a position in parallel with and at a predetermined distance from said conductor plate; first to fourth linear parasitic elements so arrayed in series at a predetermined spacing between said conductor plate and said reflecting plate as to intersect said first and second slot elements at right angles; a first switching element interposed between said first and second linear parasitic elements for switching a state to connect said first and second linear parasitic elements electrically and an unconnected state; and a second switching element interposed between said third and fourth linear parasitic elements for switching a state to connect said third and fourth linear parasitic elements electrically and an unconnected state.