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| Content Provider | IET Digital Library |
|---|---|
| Author | Li, Jun Long Liu, Hui Zhang, Shuai Zhang, Yuan He, Sailing |
| Abstract | A compact broadband circularly-polarised (CP) antenna is designed with a novel method for universal ultra-high-frequency (UHF) radio-frequency identification (RFID) readers. It is composed of a compact ring-shaped patch which aims to decrease the size of the antenna. A quadrature 3 dB coupler placed below the ground plane creates 90° phase differences to generate the CP radiation of the antenna. To improve the performance of the proposed antenna and minimise its size, the authors use a coupling feeding method, an FR4 dielectric slab, and a metal cavity. The coupled feeding is implemented to eliminate the mismatching between the long probe and the ring-shaped patch, and to improve the gain over the operating band. The introduction of an FR4 dielectric slab and a cavity can reduce the antenna size and improve the impedance matching and axial-ratio (AR) bandwidth. The antenna with a backed cavity can increase the front-to-back ratio remarkably and improve the CP performance further. The measured results show that the antenna with a low profile (0.45λ 0 × 0.45λ 0 × 0.06λ 0 at 915 MHz) has the impedance bandwidth of 30.2% (730–990 MHz) and 3 dB AR bandwidth of 24.2% (760–970 MHz). Both the impedance and the AR bandwidth cover the worldwide UHF RFID band. |
| Starting Page | 789 |
| Ending Page | 795 |
| Page Count | 7 |
| ISSN | 17518725 |
| Volume Number | 13 |
| e-ISSN | 17518733 |
| Issue Number | Issue 6, May (2019) |
| Alternate Webpage(s) | https://digital-library.theiet.org/content/journals/iet-map/13/6 |
| Alternate Webpage(s) | https://digital-library.theiet.org/content/journals/10.1049/iet-map.2018.5321 |
| Journal | IET Microwaves, Antennas & Propagation |
| Publisher Date | 2019-01-29 |
| Access Restriction | Open |
| Rights Holder | © The Institution of Engineering and Technology |
| Subject Keyword | Antenna Accessory Antenna Feeds Antenna Radiation Pattern Antenna Size AR Bandwidth Axial-ratio Bandwidth Backed Cavity Broadband Antenna Compact Broadband Circularly-polarised Antenna Compact Ring-shaped Patch Coupled Feeding Coupling Feeding Method CP Performance CP Radiation Electromagnetic Wave Polarisation FR4 Dielectric Slab Frequency 730.0 MHz to 990.0 MHz Front-to-back Ratio Ground Plane Impedance Matching Metal Cavity Microstrip Antenna Noise Figure 3.0 DB Phase Differences Quadrature Coupler Radiofrequency Identification RFID System Single Antenna Slot Antenna UHF Antenna UHF Couplers UHF RFID Application UHF RFID Band Ultra-high-frequency Radio-frequency Identification Readers Waveguide And Microwave Transmission Line Component |
| Content Type | Text |
| Resource Type | Article |
| Subject | Electrical and Electronic Engineering |
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