Abstract
This study presents a novel compact circularly polarized antenna for universal ultrahigh-frequency (UHF) radio-frequency identification (RFID) handheld reader applications. The antenna is composed of a coplanar waveguide (CPW) L-shaped feedline mounted at the right edge of the square slot at the bottom of the ground plane to realize a circular polarization; a horizontal stub protruded from the right side of the square slot towards the slot centre, and a vertical stub is mounted at the lower left of the square slot. The designed antenna printed on one ground plane layer of a low-cost FR4 substrate with an overall size of 120×120×1.6 mm3. The measurement results show indicate that the fabricated antenna achieves a wide axial ratio (AR) bandwidth of 460 MHz (818–1278 MHz), wide impedance bandwidth of 54.6% (630–1103 MHz), and a measured peak gain of 4.0 dBi. The proposed antenna is a good candidate for compact universal UHF RFID handheld reader applications (840–960 MHz).
Highlights
Radio-frequency identification (RFID) is an auto-ID technology that uses radio-frequency waves for the purpose of tracking and identifying objects in supply chains, access control, warehouses, commerce, and so on [1, 2]
We propose a novel low-profile circularly polarized (CP) reader antenna printed on a low-cost FR-4 material that has a small size and covers the entire UHF RFID band
The antenna consists of a coplanar waveguide (CPW) L-shaped feedline mounted at the right edge of the square slot at the bottom of the ground plane; a horizontal stub protrudes from the right side of the square slot towards the slot centre, and a vertical stub is placed at the lower left of the square slot
Summary
Radio-frequency identification (RFID) is an auto-ID technology that uses radio-frequency waves for the purpose of tracking and identifying objects in supply chains, access control, warehouses, commerce, and so on [1, 2]. A planar, lightweight, crossed-dipole antenna with CP radiation is introduced for application in a UHF RFID handheld reader in [15], and a CP monopole antenna using a short-circuited sleeve strip for a UHF RFID reader is presented in [16]; both designs have small sizes and printed on a single layer of ground plane. Both antennas have a narrow axial ratio bandwidth and low measured gain, and do not cover the global UHF RFID frequency range. A parametric study for the significant parameters of the designed antenna as well as a comparison between the proposed antenna and other antennas operating in the UHF RFID band is conducted
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