The <i>In-Situ</i> Technique for Measuring Input Impedance and Connection Effects of RFID Tag Antenna

Mats, Leonid; Cain, James T.; Mickle, Marlin H.

doi:10.1109/tase.2008.917082

Cited by 11 publications

(2 citation statements)

References 10 publications

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“…Measurement accuracy relies strongly on the setup and environment. It also needs post-processing [6]. As most VNAs are equipped with only single-ended ports, to characterize a balanced device, special procedure and method must be designed.…”

Section: Impedance Measurement Of Differential Devicesmentioning

confidence: 99%

Impedance measurement for balanced UHF RFID tag antennas

Zhu

Ko²,

2010

2010 IEEE Radio and Wireless Symposium (RWS)

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Dipole antennas in UHF RFID tags are driven by differential signals; it is difficult to measure the antenna input impedance accurately using single-ended probes. Furthermore, the testing fixture used in the antenna measurement process also induces additional parasitic effects; accurate measurement cannot be achieved without taking the fixture impact into consideration. In this paper, we propose to characterize the dipole antenna's input impedance using mixed mode S-parameters, the testing fixture impact can also be quantified with port extension and de-embedding techniques. Experiments demonstrate that the proposed measurement method achieves very consistent results over UHF frequency band with very high accuracy.Index Terms -Impedance measurement, radio frequency identification (RFID), balanced antenna, network analyzer, de-embedding, mixed-mode S-parameter.

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Section: Impedance Measurement Of Differential Devicesmentioning

confidence: 99%

Impedance measurement for balanced UHF RFID tag antennas

Zhu

Ko²,

2010

2010 IEEE Radio and Wireless Symposium (RWS)

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“…The tag antenna is an essential circuit in passive or active transponders and RFID systems [6], [7], [8], [9], [10], [11], [12]. Therefore it is necessary to match the input impedance of the antenna to a load in order to efficiently couple the RF power.…”

Section: Introductionmentioning

confidence: 99%

A Novel Low Cost Planar RFID Miniature Antenna

Zbitou¹,

Chakkor²,

Yahya³

et al. 2013

EEE

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This paper presents a new miniature low cost planar RFID antenna designed @ 2.45 GHz. In order to validate the final structure, we have conducted a study on two antenna structures. The first one is based on a rectangular patch with a centred slot line, and the second one is based on a monopole antenna. By comparing the performances of both structures we have chosen the second one because due to the fact that presents a miniature d imensions and especially due to their compactness and robustness against the mechanical tolerances. The antenna achieved and measured demonstrates a good agreement between simulat ion and measurement results. Moreover, for imp roving the matching input impedance of the antenna, we have studied and optimized all geo metry dimensions of the whole structure. For the feed line we have used a CPW feed wh ich permits to integrate this antenna easily with the memo ry circuit to fo rm a tag system.

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