Dual-Band Circularly Polarized Microstrip RFID Reader Antenna Using Metamaterial Branch-Line Coupler

• Published in: IEEE transactions on antennas and propagation Vol. 60; no. 2; pp. 786 - 791
• Main Authors: JUNG, Youn-Kwon, LEE, Bomson
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01-02-2012; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Antenna measurements; Antennas; Applied sciences; Circular polarization; Couplers; Dual band; Exact sciences and technology; Gain; Joining; metamaterial; Metamaterials; Noise levels; Radio frequency identification; Radiocommunications; Radiofrequency identification; Radiolocalization and radionavigation; Readers; RFID reader antenna; Telecommunications; Telecommunications and information theory; UHF; UHF antennas; UHF measurements; Polarization diversity; RFID reader; Circular polarization; Microwave; Aperture coupling; Antenna gain; dual-band; UHF wave; Microstrip antennas; Axial ratio; Receiving antenna; Permittivity; Metamaterial; RFID reader antenna; Radio frequency identification
• ISSN: 0018-926X; 1558-2221
• DOI: 10.1109/TAP.2011.2167943

A dual-band circularly polarized aperture coupled microstrip RFID reader antenna using a metamaterial (MTM) branch-line coupler has been designed, fabricated, and measured. The proposed antenna is fabricated on a FR-4 substrate with relative permittivity of 4.6 and thickness of 1.6 mm. The MTM coupler is designed employing the provided explicit closed-form formulas. The dual-band (UHF and ISM) circularly-polarized RFID reader antenna with separate Tx and Rx ports is connected to the designed metamaterial (MTM) branch-line coupler. The maximum measured LHCP antenna gain is 6.6 dBic at 920 MHz (UHF) and RHCP gain is 7.9 dBic at 2.45 GHz (ISM). The cross-polar CP gains near broadside of the RFID reader antenna are approximately less than - 20 dB compared with the mentioned co-polar CP gains in both bands. The isolations between the two ports are about 25 dB and 38 dB, at 920 MHz and 2.45 GHz, respectively. The measured axial ratios are less than 0.7 dB in the UHF band (917-923 MHz) and 1.5 dB in the ISM band (2.4-2.48 GHz).