WIDEBAND ANTENNA HAVING A BLOCKING BAND

摘要

Disclosed is a wideband antenna for a wideband communication system such as a UWB communication system, which is capable of blocking radiation of a frequency band in which there is a risk of competition with frequency bands utilised by other wireless communication systems. The antenna includes a grounding plate (17) and a main antenna body (10) that is provided at a prescribed distance above the grounding plate (17). The main antenna body (10) includes a power supply element (14) and a dielectric substrate (12). An unpowered element (11) in the shape of a ring is arranged separated by a prescribed gap (13) from the power supply element (14) on the upper surface of the dielectric substrate (12). A prescribed number of short-circuiting pins (15) are arranged at equal intervals at the periphery of the unpowered element (11), the unpowered element (11) and the grounding plate (17) being connected by these short-circuiting pins (15). Slits (16) are provided in the unpowered element (11) in the vicinity of the short-circuiting pins (15). The slits (16) provided in the unpowered element (11) form a resonance circuit, the frequency of which is determined by the shapes of the slits, in the vicinity of the slits in the unpowered element (11), and components having said frequency are prevented from being irradiated from the power supply element (14).