Capacitively fed ultra wide band monopole antenna

摘要

A UWB antenna (10) has an upper dielectric (11), a lower dielectric (13), and a conductive pattern (15) sandwiched therebetween. The conductive pattern has a vertex (151) apart from a feeding point (17) with a predetermined gap. The conductive pattern has a reversed triangular portion (15-1) having a right-hand taper part (152) and a left-side taper part (153) which widen from the feeding point at a predetermined angle toward a right-hand side surface (10rs) and a left-hand side surface (10ls), respectively, and a semicircular portion (15-2) having a base side (15-2b) being in contact with an upper side (15-1u) of the reversed triangular portion. The UWB antenna further has a feeding pattern (25) connected to the feeding point, whereby carrying out feed from the feeding pattern to the conductive pattern by electromagnetic coupling.