Human effect on on-body selective combining at 2.4 GHz

Al-Saffar, D.; Kadhim, Esraa Habeeb; Edwards, R.M.; Ojerinde, O. A.; AlSabbagh, Haider M.; Panagamuwa, Chinthana

doi:10.1109/lapc.2014.6996402

Cited by 3 publications

(3 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…(1) The difference of approximately 3dBm between the result of equation 1 and the measured values can reasonably be assumed to be cabling and antenna mismatch combined with absorption by the volunteer in the human present set. It has previously been established that the RF link does experience additional signal attenuation for due to a human in the channel [8][9] [10].…”

Section: Resultsmentioning

confidence: 99%

A software defined radio comparison of received power with quadrature amplitude modulation and phase modulation schemes with and without a human

Al-Saffar

Edwards

2016

2016 10th European Conference on Antennas and Propagation (EuCAP)

Self Cite

View full text Add to dashboard Cite

Section: Resultsmentioning

confidence: 99%

A software defined radio comparison of received power with quadrature amplitude modulation and phase modulation schemes with and without a human

Al-Saffar

Edwards

2016

2016 10th European Conference on Antennas and Propagation (EuCAP)

Self Cite

View full text Add to dashboard Cite

“…While this results in an improvement in outage, it will also lead to an increase in infrastructure cost due to the relatively expensive readers. Also, two antennas were used to implement selective combining diversity in [15] for on-body communication that was not RFID.…”

mentioning

confidence: 99%

Tag diversity of inkjet printed body‐worn radio frequency identification integrated medical sticking plasters for wireless monitoring

Oyeka

Batchelor

Ziai

et al. 2016

Healthcare Technology Letters

View full text Add to dashboard Cite

1. Introduction: Radio Frequency Identification (RFID) has found use in areas such as access control systems, point of sale, automatic toll collection, animal tracking, vehicle tracking and immobilization and also in the retail supply chain [1]. For medical applications, RFID technology can be used for patient tracking and safeguarding [2] as well as for equipment inventory management. RFID tags have also been used for physiological monitoring [3].The use of wireless monitoring in a hospital environment aims to improve the efficiency of patient care. Advances have seen the use of RFID technology as a standalone system or in combination with other wireless technologies [4]. Proposed battery-less wireless health sensors [5] will transmit patient vital data and therefore the risks associated with signal outage are high making it important to keep skin mounted RFID tag read failure to a minimum.Human tracking and monitoring can be achieved with RFID chips embedded in the skin [6] however this is very short read range and is inappropriate for non-permanent applications. Alternatively RFID wristbands [7] are widely used but must go on the wrist or ankle and offer only a loose contact to the skin which compromises their use for monitoring. For instance, it may not be optimal for physiological measurements such as heartbeat and pulse which require close skin contact [8]. The use of RFID for medical sensing has also been reported in works such as [9] where an adhesive sensor badge is reported for sensing biomarkers in sweat and in [10] for monitoring surface temperature.Diversity is a technique used in communication systems where alternative transmission mechanisms are introduced to reduce the chance of losing communication (signal outage). In RFID, the chances of successfully reading a tagged object or person are increased if more than one tag is used. This is referred to as tag diversity. In [11] a plaster operating over a few centimetres at the NFC frequency of 13.56 MHz was presented and in [12] the most efficient tag placement for two worn UHF tags communicating with an external reader was studied using 3 mm thick textile slotted patch antennas. The study indicated more than 2 tags of the slotted patch design were required to provide coverage all around the body. Other works such as [13] have sought to improve the performance of on-body RFID tags by using dual tag antenna diversity to reduce the probability of phase cancellation between the RFID reader continuous carrier wave and the backscattered signal from the tag. Diversity is already often implemented at the reader end and in [14] a non-RFID body mounted wireless system utilizes multiple antennas at the off-body base station. While this results in an improvement in outage, it will also lead to an increase in infrastructure

show abstract

“…For reception on the body and to reduce fading a partial solution is to have multiple on-body receive antennas [2][3][4] so that diversity techniques can be used, for example selection combining (SC), maximal ratio combining (MRC) and equal gain combining (EGC) diversity, all on the body.…”

mentioning

confidence: 99%

The effects of water on an on-body monopole diversity antenna pair at 1800MHz

Al-Saffar

Khattak

Edwards

2016

2016 Loughborough Antennas &Amp; Propagation Conference (LAPC)

Self Cite

View full text Add to dashboard Cite

Abstract-This paper presents the effect of water on a pair of 1.8GHz on-body diversity monopole antennas mounted on the forearm of a sitting male static volunteer. Application of a water layer to the forearm was seen to both reduce efficiency and increase directivity leading to a slight overall increase in gain. Increased gain was shown to increase antenna correlation thereby reducing diversity gain in the antenna pair.

show abstract

Human effect on on-body selective combining at 2.4 GHz

Cited by 3 publications

References 4 publications

A software defined radio comparison of received power with quadrature amplitude modulation and phase modulation schemes with and without a human

A software defined radio comparison of received power with quadrature amplitude modulation and phase modulation schemes with and without a human

Tag diversity of inkjet printed body‐worn radio frequency identification integrated medical sticking plasters for wireless monitoring

The effects of water on an on-body monopole diversity antenna pair at 1800MHz

Contact Info

Product

Resources

About