Off-Body Antenna Dual-Beam Linear To Circular Polarization Converter Based On Quarter-Wave Cross-Slot Frequency Selective Surface

This paper presents a dual-beam wearable antenna based on AMC-FSS technology with a transmission type polarizer to convert linear to circular polarization at 5.8 GHz. The design is composed of 3 layers, an AMC substrate, a planar monopole and a tilted 45 cross-slots FSS superstrate. The structure provides a 1.69 dB of axial ratio purity polarization and a valuable gain of 7.32 dBi at the ISM band. The dual beam radiation pattern makes the antenna a good candidate for Off-Body underground communications.