High-Directivity and Circularly Polarized Compact Patch Antenna for UHF RFID Reader Devices

This paper presents the design, construction, and testing of a high directivity circularly polarized small patch antenna for RFID Base Stations (Readers) operating in European UHF band. The designed optimized structure has 15cm ×15 cm × 0.6 compact size where -3dB beam angle is reduced by using slotted ring embedded patch. gain at 862 MHz 3.2 dBic with E H plain are 61.6º 65.2º respectively. Finally, compared to single-layer same cross-sectional dimensions as proposed structure.