1 × 2 wideband patch-dipole antenna array with slot coupler

A 1 × 2 wideband patch-dipole antenna array is proposed, which consists of a slot coupler, a cavity and two pairs of bow-tie dipole antennas loaded with meandering loops. The slot coupler has two functions: one is to work as a divider and the other is to generate differential signals for bow-tie dipole antennas. Each bow-tie dipole antenna is conveniently and differentially fed by two parallel probes located symmetrically at both sides of the slot coupler. A prototype is fabricated and measured for verification. The experimental results show that the proposed antenna array achieves a bandwidth of 66.4% ranging from 1.59 to 3.17 GHz. Stable radiation patterns with low cross-polarisation and a flat gain fluctuating in the range of 10.2 ± 1.5 dBi are found over the whole frequency band.