Wearable Circularly Polarized Antenna for Personal Satellite Communication and Navigation

Kaivanto, Emmi; Berg, Markus; Salonen, E.; Maagt, P. de

doi:10.1109/tap.2011.2165513

Cited by 147 publications

(72 citation statements)

References 12 publications

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“…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. Also the bendable features [11] might be required for an antenna because of 1) a body shape, 2) integration to clothing or 3) the natural movements of a human.…”

mentioning

confidence: 99%

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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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confidence: 99%

“…Several type of antennas have been reported for wearable connections, and probably most of them are monopoles or patches structures, e.g., in [3,11]. Since the aim of the present paper is to examine the interaction and physical behaviour between an antenna and tissue, we have chosen four representatives for investigations.…”

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

Self Cite

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“…Later, other, more sophisticated wearable antennas, with improved performance, were proposed for satellite-based communications. In particular, Kaivanto et al [36] A further improvement to this problem is represented by a recent contribution by Dierck et al [37]. The proposed antenna, which enables dual-band operation in GPS and Iridium bands, is additionally equipped with an active circuit, containing a Low Noise Amplifier (LNA) chip, conveniently integrated on the feed plane on the back side of the structure, enhancing the overall performance.…”

Section: Satellite Communication Bands: Gps Galileo Iridiummentioning

confidence: 99%

Latest developments in the field of textile antennas

Vallozzi¹,

Hertleer²,

Rogier³

2016

Smart Textiles and Their Applications

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“…Being flexible, light weight, and conformable to the wearer, a communication system based on textile antennas can be fully integrated into clothing [1][2][3][4][5]. For example, one type of application for wearable antenna systems involves monitoring the activity and life signs of rescue workers active in the field, with the electronics being integrated into protective garments, setting up the off-body wireless communication link between the wearer and the closest base station [6].…”

Section: Introductionmentioning

confidence: 99%

High-Gain Textile Antenna Array System for Off-Body Communication

Scarpello

Vallozzi

Rogier

et al. 2012

International Journal of Antennas and Propagation

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A novel high-gain textile antenna array system, fully integrated into a rescue-worker's vest and operating in the Industrial, Scientific, and Medical wireless band (2.4-2.4835 GHz), is presented. The system comprises an array consisting of four tiptruncated equilateral triangular microstrip patch antennas (ETMPAs), a power divider, line stretchers, and coaxial cables. The array is vertically positioned on the human torso to produce a narrow beam in elevation, as such reducing fading and allowing to steer the maximum gain in a small angular sector centered around the broadside direction. To allow simple low-cost beam steering, we specifically minimize mutual coupling by using a relative large distance between the patches and by selecting the ETMPA element as the most suited topology from three potential patch geometries. Moreover, we investigate the stability of return loss and mutual coupling characteristics under different relative humidity conditions, when bending the array, when placing the system on-body, and when covering it by different textile layers. Reflection coefficient and gain patterns are simulated and measured for the antenna system in free space and placed on the human body.

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Wearable Circularly Polarized Antenna for Personal Satellite Communication and Navigation

Cited by 147 publications

References 12 publications

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

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

Latest developments in the field of textile antennas

High-Gain Textile Antenna Array System for Off-Body Communication

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