Design and packaging of a compact circularly polarised planar antenna for 2.45‐GHz RFID mobile readers. Issue 13 (26th July 2019)

• Record Type: Journal Article
• Authors: Gautam, Anil Kumar; Farhan, Mohd.; Agrawal, Niraj; Rambabu, Karumudi
• Is Part Of: IET microwaves, antennas & propagation. Volume 13:Issue 13(2019)
• Page Start: 2310
• Page End: 2314
• Publication Date: 2019-07-26
• Subjects: antenna radiation patterns -- radiofrequency identification -- planar antennas -- microstrip antennas -- electromagnetic wave polarisation -- UHF antennas; packaging -- compact circularly polarised planar antenna -- miniaturised planar microstrip antenna -- square‐shaped radiator -- miniaturisation method -- CP radiation -- RFID mobile reader applications -- good radiation performance -- RFID mobile readers -- radio‐frequency identification applications -- frequency 2.42 GHz to 2.5 GHz -- frequency 2.447 GHz to 2.468 GHz -- size 19.6 mm -- size 30 mm -- size 1.6 mm -- bandwidth 21.0 MHz; Microwaves -- Periodicals; Microwave antennas -- Periodicals; Antennas (Electronics) -- Periodicals; Radio wave propagation -- Periodicals; Microwave communication systems -- Periodicals; 621.381305
• DOI: 10.1049/iet-map.2019.0261
• Languages: English
• ISSNs: 1751-8725

Abstract

Abstract : In this study, a novel design and packaging of miniaturised planar microstrip antenna with circular polarisation (CP) that is suitable for 2.45‐GHz radio‐frequency identification (RFID) applications is proposed. The circular polarisation is realised by truncating the corners of the left to right diagonal and 76% of miniaturisation is achieved by incorporating two slots in each of the four directions and one at the centre of the square‐shaped radiator. This type of miniaturisation method is known in the literature but combining with CP radiation is a novel approach. The radiator of the designed antenna has a compact size of 19.6 × 19.6 mm 2 with an overall size of the antenna 30 × 30 × 1.6 mm 3, and this technique offers 76% miniaturisation in antenna size. Finally, a prototype antenna is fabricated and experimentally characterised to verify the design concept as well as to validate the simulation results. The designed antenna achieves measured return loss bandwidth of around 80 MHz (2.42– 2.5 GHz) and axial ratio bandwidth of 21 MHz (2.447–2.468 GHz). The proposed antenna is a good candidate for RFID mobile reader applications as it shows a good radiation performance, when it is installed in various types of housing.