Circularly polarized UHF-RFID antenna using defected rectangular plate on the ground plane

Phongcharoenpanich, Chuwong; Dentri, Sitthichai

doi:10.1109/apcap.2012.6333157

“…Among many others, Electromagnetic Band Gap (EBG) and/or UC-PBG were introduced in [7][8][9][10][11], to utilize an improvement in the antenna gain for their versatility and ease of fabrication. In this context, various geometries have found their way in designing circularly polarized antennas for RFID readers' applications [12][13][14][15][16][17][18][19][20][21][22]. Therefore, it is the subject for this research to construct a circularly polarized microstrip antenna with a high gain mounted underneath of a double layered UC-PBG structure with 7×7 unit cell arrays.…”

Section: Introductionmentioning

confidence: 99%

On the Performance of a Microstrip Antenna Based UC-PBG Structures for UHF RFID Readers

Jalal¹,

Jwair²

2018

ETJ

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Microstrip antennas suffer from low gain bandwidth product due to surface wave effects and aperture diffractions that limit their use for longrange communications. On top of that, the difficulty of achieving a pure circularly polarized radiation with high gain due to the feeding structure effects. This paper is subjected to design a gain enhanced circularly polarized patch antenna using Uniplanar Compact-Photonic Band Gap (UC-PBG) structu.res for UHF RFID applications. The patch is structured as truncated corners with cross slots at the centre mounted on an FR-4 epoxy substrate of 1.6mm thickness with an overall area of 188×188mm 2. The UC-PBG is constructed of two layers; each is made of 7×7 unit cells, separated by 20mm mounted from the top of the patch at 30mm height. The unit cell characterizations are evaluated in terms of their S-parameters and dispersion diagram CST-MWS environment. The antenna shows a boresight gain of about 8.2 dBi at 915MHz with a front to back ratio (F/B) of 13dB. The benchmark enhancement in boresight gain after adding the UC-PBG layers is found to be 3.4 dBi with a radiation efficiency of 87%. Finally, an excellent agreement is achieved between the obtained measurements and numerical results.

show abstract

“…Among many others, Electromagnetic Band Gap (EBG) and/or UC-PBG were introduced in [7][8][9][10][11], to utilize an improvement in the antenna gain for their versatility and ease of fabrication. In this context, various geometries have found their way in designing circularly polarized antennas for RFID readers' applications [12][13][14][15][16][17][18][19][20][21][22]. Therefore, it is the subject for this research to construct a circularly polarized microstrip antenna with a high gain mounted underneath of a double layered UC-PBG structure with 7×7 unit cell arrays.…”

Section: Introductionmentioning

confidence: 99%

Untitled

2018

ETJ

0

View full text Add to dashboard Cite

Microstrip antennas suffer from low gain bandwidth product due to surface wave effects and aperture diffractions that limit their use for longrange communications. On top of that, the difficulty of achieving a pure circularly polarized radiation with high gain due to the feeding structure effects. This paper is subjected to design a gain enhanced circularly polarized patch antenna using Uniplanar Compact-Photonic Band Gap (UC-PBG) structu.res for UHF RFID applications. The patch is structured as truncated corners with cross slots at the centre mounted on an FR-4 epoxy substrate of 1.6mm thickness with an overall area of 188×188mm 2. The UC-PBG is constructed of two layers; each is made of 7×7 unit cells, separated by 20mm mounted from the top of the patch at 30mm height. The unit cell characterizations are evaluated in terms of their S-parameters and dispersion diagram CST-MWS environment. The antenna shows a boresight gain of about 8.2 dBi at 915MHz with a front to back ratio (F/B) of 13dB. The benchmark enhancement in boresight gain after adding the UC-PBG layers is found to be 3.4 dBi with a radiation efficiency of 87%. Finally, an excellent agreement is achieved between the obtained measurements and numerical results.

show abstract

“…In this context, the antennas for RFID reader play an important role in the communication between the reader and the tag, because there is a need to communicate with the tags in various orientations/positions. Therefore, a circularly polarized antenna is best suited to solve this problem .…”

Section: Introductionmentioning

confidence: 99%

Dual‐band antenna circularly polarized for handheld RFID reader using metasurfaces

Montalvão

¹

,

Montalvão

²

,

Neto

³

et al. 2016

Micro & Optical Tech Letters

4

0

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In this article, the authors proposed a new structure able to convert signals linearly polarized generated by a microstrip antenna for circularly polarized signals at two operating bands (2.45 and 5.8 GHz), for use in portable radio frequency identification readers, using two miniaturized metasurfaces. All simulation results were obtained using the commercial software HFSS™. Prototypes were built and their characteristics were measured. We obtained a good agreement between simulated and measured results. The proposed structure is able to obtain linear to circular conversion in two bands of interesting, with a large bandwidth for return loss and axial ratio. The structure is simple and presents good advantages as low profile and low cost. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:2294–2300, 2016

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Circularly polarized UHF-RFID antenna using defected rectangular plate on the ground plane

Cited by 4 publications

References 6 publications

On the Performance of a Microstrip Antenna Based UC-PBG Structures for UHF RFID Readers

On the Performance of a Microstrip Antenna Based UC-PBG Structures for UHF RFID Readers

Untitled

Dual‐band antenna circularly polarized for handheld RFID reader using metasurfaces

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