Measurement and Performance of Textile Antenna Efficiency on a Human Body in a Reverberation Chamber

Boyes, Stephen J.; Soh, Ping Jack; Huang, Yi; Vandenbosch, Guy A. E.; Khiabani, Neda

doi:10.1109/tap.2012.2225817

Cited by 61 publications

(35 citation statements)

References 25 publications

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“…In this case, the textiles with the lowest loss have been selected. For more constrained envelopes, where, due to a reduced antenna ground plane, the coupling with the body is higher, the best overall performance is not necessarily obtained using the lowest loss materials, and thicker structures may be required [39].…”

Section: Discussionmentioning

confidence: 99%

A Flexible 2.45-GHz Power Harvesting Wristband With Net System Output From −24.3 dBm of RF Power

Adami

Proynov

Hilton

et al. 2018

IEEE Trans. Microwave Theory Techn.

150

159

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General rightsThis document is made available in accordance with publisher policies. Please cite only the published version using the reference above. Abstract-This paper presents a flexible 2.45-GHz wireless power harvesting wristband that generates a net dc output from a −24.3-dBm RF input. This is the lowest reported system sensitivity for systems comprising a rectenna and impedancematching power management. A complete system has been implemented comprising: a fabric antenna, a rectifier on rigid substrate, a contactless electrical connection between rigid and flexible subsystems, and power electronics impedance matching. Various fabric and flexible materials are electrically characterized at 2.45 GHz using the two-line and the T-resonator methods. Selected materials are used to design an all-textile antenna, which demonstrates a radiation efficiency above 62% on a phantom irrespective of location, and a stable radiation pattern. The rectifier, designed on a rigid substrate, shows a best-inclass efficiency of 33.6% at −20 dBm. A reliable, efficient, and wideband contactless connection between the fabric antenna and the rectifier is created using broadside-coupled microstrip lines, with an insertion loss below 1 dB from 1.8 to over 10 GHz. A self-powered boost converter with a quiescent current of 150 nA matches the rectenna output with a matching efficiency above 95%. The maximum end-to-end efficiency is 28.7% at −7 dBm. The wristband harvester demonstrates net positive energy harvesting from −24.3 dBm, a 7.3-dB improvement on the state of the art.

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Section: Discussionmentioning

confidence: 99%

A Flexible 2.45-GHz Power Harvesting Wristband With Net System Output From −24.3 dBm of RF Power

Adami

Proynov

Hilton

et al. 2018

IEEE Trans. Microwave Theory Techn.

150

159

View full text Add to dashboard Cite

show abstract

“…Measurements on a real human body [105,106] or with a human phantom [107][108][109] should take place. The antenna on-body or on-phantom should be measured in terms of S11, near-field, far-field [110][111][112].…”

Section: Challenges Of Wearable Textile Antennasmentioning

confidence: 99%

Embroidery and Related Manufacturing Techniques for Wearable Antennas: Challenges and Opportunities

et al. 2014

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This paper will review the evolution of wearable textile antennas over the last couple of decades. Particular emphasis will be given to the process of embroidery. This technique is advantageous for the following reasons: (i) bespoke or mass produced designs can be manufactured using digitized embroidery machines; (ii) glue is not required and (iii) the designs are aesthetic and are integrated into clothing rather than being attached to it. The embroidery technique will be compared to alternative manufacturing processes. The challenges facing the industrial and public acceptance of this technology will be assessed. Hence, the key opportunities will be highlighted.

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“…The measurements are performed using an Anritsu 37369A Vector Network Analyser. The efficiencies and realised gain are measured in a reverberation chamber (RC) and an anechoic chamber using the approach described in [19,20], respectively. Mathematically, when acquired using an RC, the radiation efficiency and total efficiency can be calculated as follows…”

Section: Water Antenna Measurementsmentioning

confidence: 99%

Further investigation on water antennas

Xing¹,

Huang²,

Shen³

et al. 2015

IET Microwaves, Antennas & Propagation

Self Cite

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Water antennas are a special type of antennas and have attracted limited attention so far. In this study, a monopole water antenna with a dielectric layer is chosen as an example to study some less obvious characteristics of the water antenna. The resonant frequency, radiation efficiency and fractional bandwidth are of particular interest. Firstly, the effects of the dielectric layer between the water and the ground plane are studied. The results show that this layer has a crucial effect on the antenna resonant frequency and radiation efficiency. Secondly, the water with different conductivity is investigated. With different conductivity, the antenna may be regarded as a dielectric resonant antenna, a conducting antenna or their combination. Thirdly, a water antenna with a supporting structure is fabricated for validation. Measurements are conducted in an anechoic chamber and a reverberation chamber to evaluate its performance as a function of various parameters. Finally, the water temperature electromagnetic characteristics are investigated. Good agreements are achieved between the simulation and measurement results. It is shown that this type of antenna shows better performance than the conventional antenna in aspects such as broadband, cost, reconfigurability, transparency and it can be a promising candidate for a range of applications.

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Measurement and Performance of Textile Antenna Efficiency on a Human Body in a Reverberation Chamber

Cited by 61 publications

References 25 publications

A Flexible 2.45-GHz Power Harvesting Wristband With Net System Output From −24.3 dBm of RF Power

A Flexible 2.45-GHz Power Harvesting Wristband With Net System Output From −24.3 dBm of RF Power

Embroidery and Related Manufacturing Techniques for Wearable Antennas: Challenges and Opportunities

Further investigation on water antennas

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