Abstract
A Dual-Band circularly polarized (CP) tag antenna is presented in this paper, which combines ultrahigh-frequency (UHF) and ultrawideband (UWB) operations for radio-frequency identification (RFID) and high-precision localization applications. The proposed antenna consists of two CP radiating elements with separated ports, where the UHF element is a planar loop antenna loaded with two pairs of meander lines of different dimensions for compactness and CP radiation, while the UWB element is a modified Archimedean spiral antenna with a tapered metallization ratio and encircled by the UHF loop. In addition, a miniaturized shunt-stub is employed in the UHF element to realize conjugate matching between the antenna and the UHF RFID chip. Experimental characterization of a fabricated prototype has validated the design, which shows that the proposed antenna exhibits very good radiation performance at both the bands, with-10 dB power reflection bandwidths of 0.86-0.975 GHz and 2.6-12 GHz, and 3 dB axial-ratio bandwidths of 0.911-0.938 GHz and 3.1-11.1 GHz, respectively. This antenna can find applications in RFID and indoor positioning systems.
| Original language | English |
|---|---|
| Article number | 7497456 |
| Pages (from-to) | 3794-3802 |
| Number of pages | 9 |
| Journal | IEEE Transactions on Antennas and Propagation |
| Volume | 64 |
| Issue number | 9 |
| DOIs | |
| Publication status | Published - Sept 2016 |
| Externally published | Yes |
Keywords
- Circularly polarized (CP) antenna
- Ultrawideband (UWB)
- dual-band tag antenna
- ultrahigh-frequency (UHF)