Antenna unit adaptable to a wideband

摘要

In a UWB antenna (10) having an upper dielectric member (11), a lower dielectric member (13), and a conductor pattern (15) interposed therebetween, the conductor pattern has a feeding point (151) at a generally center portion of a front surface of the antenna. The conductor pattern further has an inverted triangular portion (15-1) including a right tapered portion (152) and a left tapered portion (153) extending from the feeding point towards right and left side surfaces of the antenna, respectively. A main expanding portion (15-2) expands from an upper side (154) of the inverted triangular portion. A right expanding portion (15-3) and a left expanding portion (15-4) expand from the right and the left tapered portions of the inverted triangular portion, respectively.