Abstract
We propose a wide bandwidth antenna with a circular polarization for universal Ultra High Frequency (UHF) radio-frequency identification (RFID) reader applications. To achieve a wide 3 dB axial ratio (AR) bandwidth, three T-shaped microstrip lines are inserted into the ground plane. The measured impedance bandwidth of the proposed antenna is 480 MHz and extends from 660 to 1080 MHz, and the 3 dB AR bandwidth is 350 MHz and extends from 800 to 1155 MHz. The radiation pattern is a bidirectional pattern with a maximum antenna gain of 3.67 dBi. The overall size of the proposed antenna is 114 × 114 × 0.8 mm3.
Highlights
Radio-frequency identification (RFID) technology is used in devices that transmit and receive information using radio frequency (RF) from electronic tags attached to objects in various applications
The (UHF) RFID full coverage band in each country is about 840–960 MHz
In the Ultra High Frequency (UHF) band RFID system, the antenna plays an important role in the communications between the reader and tag
Summary
Radio-frequency identification (RFID) technology is used in devices that transmit and receive information using radio frequency (RF) from electronic tags attached to objects in various applications. RFID applications in the UHF band use different frequency bands in different countries. The (UHF) RFID full coverage band in each country is about 840–960 MHz. In the UHF band RFID system, the antenna plays an important role in the communications between the reader and tag. The characteristics of the antenna determine the recognition distance between the reader and the tag. The return loss characteristics of the antenna should be as small as possible in the operating frequency band, and the antenna should be designed with a circular polarization [6,7,8]. We describe the design and fabrication of an antenna with circular polarization for an RFID reader in the UHF band. We used a T-shaped microstrip line to induce a circular polarization characteristic
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