A circular patch antenna with parasitic element for UHF RFID applications

Sim, Chow‐Yen‐Desmond; Chen, C. C.; Cao, Rong; Chen, B. S.

doi:10.1002/mmce.20905

Cited by 24 publications

(23 citation statements)

References 15 publications

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“…Table I shows the comparison between proposed CP patch antenna, Refs. [2][3][4][5][6][7][8], and those that are available commercially in the open market that operate at 865 2 956 MHz [9, 10]. By studying this table, the CP bandwidth and peak gain of proposed antenna are compatible with those reported in [2][3][4][5][6][7][8][9][10].…”

Section: Resultssupporting

confidence: 57%

“…Furthermore, unlike [6] that required a parasitic planar area of 30% over the main square patch, this parasitic element has a small planar area of only 7.8% over the main circular patch. Notably, the design of this work is an extension from [8], in which the parasitic element when added into the radiating patch only gives a CP bandwidth of (865 2 946 MHz) that does not satisfy the Universal RFID band. Furthermore, the parasitic element in this work is also much smaller than [8].…”

Section: Introductionmentioning

confidence: 99%

“…Notably, the design of this work is an extension from [8], in which the parasitic element when added into the radiating patch only gives a CP bandwidth of (865 2 946 MHz) that does not satisfy the Universal RFID band. Furthermore, the parasitic element in this work is also much smaller than [8]. Details of the proposed antenna design are presented and discussed.…”

Section: Introductionmentioning

confidence: 99%

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Broadband circularly polarized antenna with moon-shaped parasitic element

Sim

Hsu

Lin

et al. 2016

Int J RF and Microwave Comp Aid Eng

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A broadband circularly polarized (CP) circular patch antenna with an Lshaped ground plane and parasitic element is studied. The use of this L-shaped ground is to achieve short probe feed connection to the circular patch, while maintaining a certain height between the circular patch and ground plane, so that good impedance matching and bandwidth enhancement can be attained. To achieve CP radiation, two notches are initially loaded diagonally into the circular patch, and to further enhance the CP bandwidth, a novel technique of loading a small size moon-shaped parasitic element into the notched circular patch is proposed. By doing so, the CP bandwidth of proposed antenna can be tremendously increased by approximately 10%. The experimental results show that the proposed CP antenna can yield impedance bandwidth and CP bandwidth of 835-1150 MHz and 839-968 MHz, respectively, with good gain level of 7.6 dBic. Therefore, this proposed wideband CP antenna can be used for UHF (ultrahigh frequency) RFID (radio frequency identification) reader antenna that operates within the universal RFID bands (840 2 960 MHz). V C 2016Wiley Periodicals, Inc. Int J RF and Microwave CAE 26:387-395, 2016.

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Section: Resultssupporting

confidence: 57%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Broadband circularly polarized antenna with moon-shaped parasitic element

Sim

Hsu

Lin

et al. 2016

Int J RF and Microwave Comp Aid Eng

Self Cite

View full text Add to dashboard Cite

show abstract

“…Several types of LP UHF tag antennas, such as dipole, patch, and inverted F-antennas, have been studied. [1][2][3][4][5][6][7][8] In this study, the proposed LP tag received only half of the power transmitted by the CP reader antenna because of polarization mismatch. Theoretically, a half-power (3-dB) variation can change the reading range by approximately 41%.…”

Section: Introductionmentioning

confidence: 95%

“…Several types of LP UHF tag antennas, such as dipole, patch, and inverted F‐antennas, have been studied . In this study, the proposed LP tag received only half of the power transmitted by the CP reader antenna because of polarization mismatch.…”

Section: Introductionmentioning

confidence: 99%

Low‐profile CP RFID hard tag antenna with short‐circuited microstrip‐fed line mounted on metallic plane

Chen

Huang

2018

Int J RF Microw Comput Aided Eng

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In this study, a circularly polarized (CP) radio frequency identification (RFID) tag antenna with a capacitive short‐circuited microstrip feed line was mounted on a metallic plane. This tag antenna comprised a low‐profile substrate and a square‐ring patch radiator with two pairs of T‐shaped slots that produced CP radiation. A conjugate match to an Alien Higgs‐4 chip with an impedance of 8‐j149 Ω at 925 MHz was obtained by connecting two short‐circuited microstrip lines in series. This article describes a new method for matching CP impendences. The chip impedance can be easily matched by adjusting the length of microstrip lines and by using coupling gaps. Tests of an RFID reader with a linearly polarized (LP) antenna indicated that the CP tag antenna had a low 3‐dB axial ratio bandwidth (921‐930 MHz) and an omnidirectional reading range. In contrast, the LP tag had double null cancelation in the reading region. The proposed CP tag antenna had a similar reading range but a different attached orientation. This antenna tag (and other RFID hard tags) can also be affixed to surfaces with screws, pop rivets, and industrial adhesives. The proposed antenna can be attached to goods transported by freight trucks.

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Circularly polarized designs of modified isosceles triangular microstrip antennas

Deshmukh

Ray

2020

Engineering Reports

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The modified designs of different isosceles triangular microstrip antennas realized by overlapping two isosceles patches, are proposed for circularly polarized response. An offset distance between the two overlapped patches yield optimum spacing in between the orthogonal modes of the composite patch, to give circular polarization. Proposed configuration is investigated for angle increasing from 50 • to 100 •. An optimum response in terms of the bandwidth (BW) is obtained in 50 • modified isosceles patch. Here, input impedance and axial ratio (AR) BW of 646 MHz (52%) and 76 MHz (6.12%), respectively, is obtained. As an additional design feature, proposed configuration shows variation in the center frequency of AR BW against increasing isosceles angle and the offset distance. Proposed designs exhibit broadside radiation pattern with a gain of above 8 dBi, with a good agreement between the simulated and measured results. A new simpler design for circular polarized response supported with detailed design methodology are the new technical contributions in the proposed work.

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A circular patch antenna with parasitic element for UHF RFID applications

Cited by 24 publications

References 15 publications

Broadband circularly polarized antenna with moon-shaped parasitic element

Broadband circularly polarized antenna with moon-shaped parasitic element

Low‐profile CP RFID hard tag antenna with short‐circuited microstrip‐fed line mounted on metallic plane

Circularly polarized designs of modified isosceles triangular microstrip antennas

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