Planar quasi‐Yagi antenna with band rejection based on dual dipole structure for UWB

Abstract

Aiming to realise an end-on-fire antenna with band rejection for ultra-wideband (UWB) system, a planar quasi-Yagi antenna with dual-dipole structure is proposed. The antenna comprises of a coupling transition structure, two stripes and a dual-dipole connected by a coplanar stripline. The compact arrangement of the dual-dipole generates reverse currents at some specific frequency points on their edges, giving rise to phase offsets in far field. This mechanism is used to design band rejection. Simulated and measured results show that the proposed antenna has a bandwidth from 3.08 to 11.1 GHz, which covers the whole UWB band. Meanwhile, the antenna achieves a band rejection from 5.12 to 6.08 GHz, which avoids wireless local area network interference. In pass-band, the antenna achieves a moderate gain, from 4.6 to 7.1 dBi.