Flexible Low-Profile On-Metal Tag Antenna for Asset Tracking and Identification

A flexible tag antenna with a compact size of 59mm × 10mm × 3.2mm is designed for an on-metal application. However, a compact size tag will suffer radiation pattern distortion and a shorter read range. Therefore, a folded stacked radiation patch with stub has been employed to reduce the size while maintaining a good read range and wider beamwidth. The proposed tag antenna operates at 911MHz with a good read range of 20m with 154.7 degrees (E-plane) and 102.6 (H-plane) beamwidth for on-metal application.