Compact broadband circularly-polarised antenna with a backed cavity for UHF RFID applications

Junlong Li, Hui Liu, Shuai Zhang, Yuan Zhang, Sailing He

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

Resumé

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.

OriginalsprogEngelsk
TidsskriftIET Microwaves, Antennas & Propagation
Vol/bind13
Udgave nummer6
Sider (fra-til)789–795
Antal sider7
ISSN1751-8725
DOI
StatusUdgivet - 22 maj 2019

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Radio frequency identification (RFID)
Antennas
Bandwidth
Radiation
Metals

Citer dette

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title = "Compact broadband circularly-polarised antenna with a backed cavity for UHF RFID applications",
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.",
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Compact broadband circularly-polarised antenna with a backed cavity for UHF RFID applications. / Li, Junlong; Liu, Hui; Zhang, Shuai; Zhang, Yuan; He, Sailing.

I: IET Microwaves, Antennas & Propagation, Bind 13, Nr. 6, 22.05.2019, s. 789–795.

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

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AU - Zhang, Yuan

AU - He, Sailing

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