Title :
Compact dual-band circularly polarized microstrip antenna with separated transmitting and receiving ports for RFID reader applications
Author :
Ting-Jui Huang ; Heng-Tung Hsu
Author_Institution :
Dept. of Commun. Eng., Yuan Ze Univ., Chungli, Taiwan
Abstract :
A dual-band (UHF: 900-930 MHz, ISM: 2.35-2.5 GHz for North America Regulations)circularly polarized aperture coupled microstrip RFID reader antenna with separated transmitting (Tx) and receiving (Rx) ports has been designed, fabricated, and measured. The maximum measured LHCP antenna gain is 8.2 dBic at 910 MHz (UHF) and RHCP gain is 8.8 dBic at 2.45 GHz (ISM). The isolations between the two ports are about 10 dB and 33 dB, at 910 MHz and 2.45 GHz, respectively. The measured axial ratios are less than 2dB in the UHF band (870-950 MHz) and 3 dB in the ISM band (2.35-2.5 GHz). The proposed antenna is able to meet all the requirements for RFID reader applications.
Keywords :
aperture antennas; microstrip antennas; multifrequency antennas; polarisation; radiofrequency identification; LHCP antenna gain; RFID reader antenna; RHCP gain; aperture coupled microstrip antenna; circularly polarized microstrip antenna; compact dual-band antenna; frequency 2.35 GHz to 2.5 GHz; frequency 2.45 GHz; frequency 870 MHz to 950 MHz; frequency 900 MHz to 930 MHz; frequency 910 MHz; receiving port; transmitting port; Antenna measurements; Dual band; Microstrip antennas; Radiofrequency identification; UHF antennas; UHF measurements; Circular polarization; ISM; RFID reader; UHF; antenna; dual-band;
Conference_Titel :
Microwave Conference Proceedings (APMC), 2012 Asia-Pacific
Conference_Location :
Kaohsiung
Print_ISBN :
978-1-4577-1330-9
Electronic_ISBN :
978-1-4577-1331-6
DOI :
10.1109/APMC.2012.6421922
