Radiation Efficiency Measurement Method for Passive UHF RFID Dipole Tag Antennas

Koski, Eveliina; Björninen, Toni; Ukkonen, Leena; Sydänheimo, Lauri

doi:10.1109/tap.2013.2261448

Cited by 10 publications

(6 citation statements)

References 14 publications

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“…However, it is noted that the transmission coefficient of metallic car body presence is almost identical with free space. In theory, objects in contact or in close proximity to an antenna, such as highloss and high-dielectric human body and metallic objects, will severely degrade the antenna radiation efficiency due to reduction in the antenna radiation resistance [11]. By intuition, the antenna tends to radiate efficiently when the antenna electrical size is in the same range as the wavelength, indicating that favourable antenna geometry is required for good radiation efficiency performance as well.…”

Section: Resultsmentioning

confidence: 99%

Multi-Band Antenna Array Based on Double Negative Metamaterial for Multi Automotive Applications

Alqadami¹,

Jamlos²,

Islam³

et al. 2017

PIER

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Abstract-This paper presents a design of multi-band array antenna based on Double Negative Metamaterial (DNM) unit cells for multi-automotive applications. The antenna consists of 4 × 4 rectangular and circular radiating patches connected in series using microstrip lines and fed by a 50 Ω corporate microstrip line. An array of 4×6 wire loaded complementary spiral resonator (CSR) unit cells is placed on its reverse side to provide miniaturization and multiband features to the proposed design. The reflection coefficient (S 11 ), mutual coupling, effective diversity gain (EDG), envelope correlation coefficient (ECC), and radiation patterns are evaluated for four elements of the proposed antenna placed in four different locations on the car body model. Simulations and measurements indicated that the proposed antenna features a low mutual coupling (< −34 dB), low ECC (< 0.01), high EDG (> 9.995), high efficiency (72%-95%), and low on-car detuning over the desired five bands; 1.99 GHz to 3.03 GHz, 5.15 GHz to 6.369 GHz, 7.67 GHz to 7.99 GHz, 9.91 GHz to 10.23 GHz, and 11.79 GHz to 12.2 GHz. The performance of ECC between four antennas on car body has been investigated in different cases of isotropic, indoor, and outdoor. The metallic effect on antennas performance also has been investigated by evaluating the mutual coupling and transmission coefficient between two antennas served as transmitter and receiver with presence of car body. The results show transmission coefficient of proposed DNM antenna with metallic presence almost identical to free space across desired frequency bands. With all capabilities mentioned the antenna has potential for WiFi/WiMAX, Vehicleto-Vehicle (V2V), transportable earth exploration satellite, military requirement for land vehicles, and earth stations on vessels applications.

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Section: Resultsmentioning

confidence: 99%

Multi-Band Antenna Array Based on Double Negative Metamaterial for Multi Automotive Applications

Alqadami¹,

Jamlos²,

Islam³

et al. 2017

PIER

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“…The proposed tag antenna has an impedance of 23+j224 Ω which is mismatched with the conventional commercially available PNA impedance ( 50 Ω ). A method is presented in [ 11 ] to measure the radiation pattern of the tag antenna. However, the method involves a Tagformance measurement system.…”

Section: Resultsmentioning

confidence: 99%

Design of a Miniaturized Meandered Line Antenna for UHF RFID Tags

et al. 2016

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A semi-circle looped vertically omnidirectional radiation (VOR) patterned tag antenna for UHF (919–923 MHz for Malaysia) frequency is designed to overcome the impedance mismatch issue in this paper. Two impedance matching feeding strips are used in the antenna structure to tune the input impedance of the antenna. Two dipole shaped meandered lines are used to achieve a VOR pattern. The proposed antenna is designed for 23-j224 Ω chip impedance. The antenna is suitable for ‘place and tag’ application. A small size of 77.68×35.5 mm2 is achieved for a read range performance of 8.3 meters using Malaysia regulated maximum power transfer of 2.0 W effective radiated power (ERP).

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“…The monostatic configuration uses the same antenna for both receiving and transmitting purposes . A circulator is used between the reader and the antenna in order to isolate the transmitted signal from receiving one.…”

Section: Realizations and Measurementsmentioning

confidence: 99%

Analysis, design, and measurements of an ultrasmall on‐metal UHF RFID tag antenna

Abdallah¹,

Carle²,

Mondon³

2019

Micro & Optical Tech Letters

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An ultrasmall radiofrequency identification (RFID) tag antenna is proposed for metallic applications. The antenna consists of a loop structure on FR4 substrate with a chip on the side. The overall dimensions of the tag are 10 × 10 × 2.07 mm (0.03λ × 0.03λ × 0.006λ). Studies demonstrate that the proposed antenna is a good candidate for RFID tags to be mounted on metallic surfaces. Experimental results demonstrate that the tag is able to achieve a read distance of 20 cm with an equivalent isotropic radiated power of 1.64 W when attached to a metallic object. The proposed antenna is proved to be competitive against state of the art.

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Radiation Efficiency Measurement Method for Passive UHF RFID Dipole Tag Antennas

Cited by 10 publications

References 14 publications

Multi-Band Antenna Array Based on Double Negative Metamaterial for Multi Automotive Applications

Multi-Band Antenna Array Based on Double Negative Metamaterial for Multi Automotive Applications

Design of a Miniaturized Meandered Line Antenna for UHF RFID Tags

Analysis, design, and measurements of an ultrasmall on‐metal UHF RFID tag antenna

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