Design of the Planar Cross Dipole Reader Antenna for UHF RFID Systems

• Published in: Journal of electromagnetic waves and applications Vol. 26; no. 7; pp. 962 - 972
• Main Authors: Lee, J.-N., Jung, J.-H.
• Format: Journal Article
• Language: English
• Published: Routledge 01.05.2012
• ISSN: 0920-5071; 1569-3937
• DOI: 10.1080/09205071.2012.710424

The planar dipole reader antenna using a dual polarization, which consists of two dipole radiating patches and Wilkinson power divider, is presented. The electric cross dipole is added to generate a symmetric radiation pattern and to compensate the high back radiation due to the shortened patches. From experimental results, the measured impedance bandwidth of the antenna (defined by −10 dB return loss) is 30 MHz (907 MHz-954 MHz, Korea standard = 917 MHz-923.5 MHz). Simulated isolation between the two input ports is over 35 dB. The measured gain of the proposed antenna is stable with frequency. The average gain is about 6.3 dBi.