A simple UHF RFID circularly-polarized reader antenna design

Lu, Youyou; Cui, Hengrong; Sun, Xu-Bao; Xu, Min; Yin, Yuhang

doi:10.1109/edaps.2011.6213755

Cited by 10 publications

(3 citation statements)

References 7 publications

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“…Circularly polarized (CP) antennas can be employed to mitigate the multipath interference effects in various wireless systems. Owing to such a feature, a series of CP antennas has been developed and used in satellite communications, radio frequency identifications, wireless local networks, and the global positioning system . According to their respective operation principle, conventional CP antennas can be categorized into 3 distinctive types.…”

Section: Introductionmentioning

confidence: 99%

Balanced circularly polarized square loop antenna under even-mode resonance

Yuan

Gao

et al. 2018

Int J RF Microw Comput Aided Eng

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Design approach to a novel balanced, circularly polarized (CP) square loop antenna under even‐mode resonance is proposed in this paper. The loop antenna is diagonally fed by a fork‐like dipole launcher. By matching the respective natural boundary condition of the loop radiator and the dipole launcher, the resonant even‐mode with inherent CP radiation characteristic can be sufficiently excited. Both the bi‐ and uni‐directional cases are designed and investigated. A bi‐directional CP loop antenna with a 3‐dB ratio axial ratio (AR) bandwidth of 6.6% is designed at first. A uni‐directional antenna having a planar metallic reflector is further designed. The uni‐directional loop antenna exhibits excellent uni‐directional CP performance with a high front‐to‐back ratio of 40dB and a 3‐dB AR bandwidth of 7.6% in both theory and experiment.

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Section: Introductionmentioning

confidence: 99%

Balanced circularly polarized square loop antenna under even-mode resonance

Yuan

Gao

et al. 2018

Int J RF Microw Comput Aided Eng

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“…Substrate integrated waveguide (SIW) is also used to generate CP reconfigurable antenna [12] while in [13] a cavity backed SIW antenna with a slot generates CP. Other designs are also reported for GNSS system and RFID system using CP antennas for reliable communication [14,15]. The above-mentioned Sub-6 MIMO antennas have no circular polarization, and there is no integrated LTE band and 4G band, which are useful for LTE (800 MHz), 3G, 4G, as well as 5G.…”

Section: Introductionmentioning

confidence: 99%

Pattern Diversity Mimo 4g and 5g Wideband Circularly Polarized Antenna With Integrated Lte Band for Mobile Handset

Chaudhary¹,

Kumar²,

Yadav³

2020

PIER M

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The present work describes a unique planar wideband circularly polarized MIMO antenna for 4G and Sub-6 5G band (1.35-2.75 GHz), with pattern diversity over the entire axial-ratio bandwidth. The design consists of two tri-branch planar inverted-F antenna (PIFA) antennas with a ground T-stub between the antennas, which is used to realize circular polarization and high isolation. The third antenna is an integrated Sub-6 5G (4.45-4.7 GHz) and LTE band (786.7-807.7 MHz) antenna, which is folded above the ground and placed vertically around the side. It also provides circular polarization at LTE band. The 3 dB axial ratio bandwidth (ARBW) of the MIMO antenna is 1.08 GHz (1.47-2.55 GHz); impedance matching bandwidth (IMBW) is 1.4 GHz (1.35-2.75 GHz); and its isolation is better than 13.4 dB in the whole band. It is fabricated on an FR-4 substrate and is suitable for mobile handset.

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“…One of the most common ways to achieve circular polarization is truncating the microstrip patch resonator. With the use of a simple truncated square patch, the design in [2] is able to achieve a 3-dB axial ratio (AR) bandwidth of 2.4%. Other techniques are also combined with the truncated patch with the aim of improving its AR bandwidth.…”

Section: Introductionmentioning

confidence: 99%