Effect of the antenna-human body distance on the antenna matching in UWB WBAN applications

Tuovinen, Tommi; Kumpuniemi, Timo; Yazdandoost, Kamya Yekeh; Hämäläinen, Matti; Iinatti, Jari

doi:10.1109/ismict.2013.6521727

Cited by 47 publications

(40 citation statements)

References 13 publications

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“…The antenna distance was set to 20 mm from the body surface by inserting ROHACELL material between the antenna-body gap. In [27], the 20 mm body-antenna separation was noted to produce a similar antenna matching to the free space environment. In [28], the 20 mm distance resulted an improved path loss performance compared to smaller gap thicknesses.…”

Section: Selection Of Antenna Locations and Measurement Implementationmentioning

confidence: 97%

See 1 more Smart Citation

Categorized Uwb on-Body Radio Channel Modeling for Wbans

Kumpuniemi¹,

Hämäläinen²,

Yazdandoost³

et al. 2016

PIER B

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Abstract-A categorized radio channel modeling for wireless ultra-wideband on-body body area networks is discussed. Measurements in an anechoic chamber at fourteen antenna locations are conducted in a 2-8 GHz band. The dipole and double loop antenna types are used. Six link classes are formed based on the antenna spots on the torso, head or limb. The limb-limb and the head-limb links have the lowest and highest path losses, respectively. The head-limb links have the shortest channel impulse responses (CIRs) and limb-limb links the longest ones. The CIR amplitudes follow the inverse Gaussian distribution. The tap indexes and the total excess delays are modeled with the negative binomial distribution. In most cases, the CIRs decay faster for the dipole. Otherwise no major differences exist between the antennas.

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Section: Selection Of Antenna Locations and Measurement Implementationmentioning

confidence: 97%

“…The maximum total gains of the antennas in free space are 6 dBi and the usable frequency range is 2-12 GHz. The structures and performances of the antennas used in the work in free space and in on-body cases are described in detail in [26][27][28].…”

Section: Measurement Setupmentioning

confidence: 99%

Categorized Uwb on-Body Radio Channel Modeling for Wbans

Kumpuniemi¹,

Hämäläinen²,

Yazdandoost³

et al. 2016

PIER B

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“…The dimensions, performances and radiation patterns of the planar prototype antenna types (dipole and double loop) are described in details in [14][15][16].…”

Section: T II Measurement Setupmentioning

confidence: 99%

“…The antennas were separated from the body with a 20 mm thick piece of ROHACELL 31 HF with electrical properties corresponding to air. The 20 mm distance is found to be a balanced compromise for simultaneously providing good antenna match and acceptable channel path gains [14,15]. The links LWA-RW, LWA-LA, RW-LA and LWB-AL were measured twice in both forward and reverse direction for both antenna types.…”

Section: Measured Scenariosmentioning

confidence: 99%

Human Body Shadowing Effect on Dynamic UWB On-Body Radio Channels

Kumpuniemi

Hämäläinen

Yazdandoost

et al. 2017

Antennas Wirel. Propag. Lett.

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“…These results indicate that the proper understanding about the antenna alignment on a body has clear influence on the entire wearable system performance. In addition to the on-body antenna position, the distance on a body surface has been reported having a significant impact on the performance [6,9,10]. A natural issue causing variations for the distance on a body is clothing, which might change the wearable device positions on a body, thus should be taken into account in a design.…”

mentioning

confidence: 99%

Analysis of the Impedance Behaviour for Broadband Dipoles in Proximity of a Body Tissue: Approach by Using Antenna Equivalent Circuits

Tuovinen¹,

Berg²,

Iinatti³

2014

PIER B

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Abstract-Ultra wideband (UWB) antenna operation close to tissue is examined by using lumpedelement equivalent circuits in the present paper. The impact of tissue within the reactive near-field of the antenna is introduced in terms of efficiency, impedance and matching to 50 Ω. The parasitic components for the series-and parallel-resonant stages of the equivalent models are proposed for taking the impact of tissue into account on the antenna design. The first time the antenna impedance behaviour is presented in terms of capacitance, inductance and resistance as a function of the radiator distance on the tissue surface for UWB antennas. The capacitance was observed to increase with the distance on the tissue surface by achieving the maximum value close to the reactive near-field boundary. The inductance has the maximum on contact the tissue, decreasing strongly with the first millimetres and remaining constant with the higher distance. The maximum value of input resistance was seen to clearly increase with the distance, having the maximum value in the first third of the studied range, descending close to the value in free space at the boundary at the end. The results are achieved by realising electromagnetic simulations for the antennas and comparing the performance with the operation of the equivalent models.

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Effect of the antenna-human body distance on the antenna matching in UWB WBAN applications

Cited by 47 publications

References 13 publications

Categorized Uwb on-Body Radio Channel Modeling for Wbans

Categorized Uwb on-Body Radio Channel Modeling for Wbans

Human Body Shadowing Effect on Dynamic UWB On-Body Radio Channels

Analysis of the Impedance Behaviour for Broadband Dipoles in Proximity of a Body Tissue: Approach by Using Antenna Equivalent Circuits

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