Title :
A Koch-Shaped Log-Periodic Dipole Array (LPDA) Antenna for Universal Ultra-High-Frequency (UHF) Radio Frequency Identification (RFID) Handheld Reader
Author :
Heng-Tung Hsu ; Ting-Jui Huang
Author_Institution :
Dept. of Commun. Eng., Yuan Ze Univ., Taoyuan, Taiwan
Abstract :
In this communication, we propose a printed log-periodic dipole array (LPDA) antenna covering the universal ultra-high-frequency (UHF) radio frequency identification (RFID) band of operation. Koch-shaped dipoles together with closely-coupled parasitic elements as directors were utilized for compactness in size and improvement in front-to-back ratio (F/B ratio). The experimental results demonstrate that the proposed antenna features good impedance match, moderate gain, better than 80% total radiation efficiency and excellent front-to-back ratio over the universal UHF RFID band from 840 MHz to 960 MHz. The antenna is well suitable for applications in RFID handheld readers.
Keywords :
UHF antennas; dipole antenna arrays; radiofrequency identification; Koch-shaped LPDA antenna; Koch-shaped log-periodic dipole array antenna; RFID handheld readers; UHF RFID band; closely-coupled parasitic elements; frequency 840 MHz to 960 MHz; universal ultrahigh-frequency radiofrequency identification band; Antenna; array; dipole; log-periodic; radio frequency identification (RFID); ultra-high-frequency (UHF);
Journal_Title :
Antennas and Propagation, IEEE Transactions on
DOI :
10.1109/TAP.2013.2264451