Wideband low-profile CPW-fed slot-loop antenna using an artificial magnetic conductor

Abstract

A wideband low-profile slot-loop antenna is proposed based on an artificial magnetic conductor (AMC) reflector which is applied to a slot-loop antenna to obtain directional radiation patterns. Compared with an antenna using a metal reflector, the AMC reflector can reduce the profile of the antenna and enhance operating bandwidth. The AMC consists of 4 × 6 patches with ring slots and slits. A coplanar waveguide is introduced to the proposed slot-loop antenna so that the antenna can directly attach to the AMC surface. Thus, a low profile of 0.05λL is realised (λL is the wavelength at the lowest operating frequency). Simulation and experimental results indicate that the proposed antenna obtained a 37.9% impedance bandwidth, a 36.7% 3-dB gain bandwidth, and a 6.85 dBi peak gain.