Radio engineering for wireless communication and sensor applications - Book Review

Räisänen, Antti V.; Lehto, A.

doi:10.1109/mei.2004.1307098

Cited by 18 publications

(31 citation statements)

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“…In addition, related to the best use position/distance on-body, studies in [1,9] have concluded that when no body tissues are in the range of the closest space surrounding an antenna (i.e., within reactive near-field [14,15] or Wheeler's radiansphere [16]), achievable performance can be relatively close to that of up to free space. However, the boundary of the field is challenging to explain unambiguously, because of the changes in fields happen gradually [17]. Further, it should be understood that the reactive proportion of the near-field does not radiate.…”

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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mentioning

confidence: 99%

“…Further, it should be understood that the reactive proportion of the near-field does not radiate. Nevertheless, it is the important proportion of the radiation mechanism [17]. We assume that the most of the wearable antennas will be used in the said range, which is the content of the present paper to examine.…”

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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“…In theory, a resonance frequency f res for a circuit including L n and C n can be given by the well-known equation [20] …”

Section: Equivalent Circuits For Single-and Multi-resonant Dipole Antmentioning

confidence: 99%

“…First, planar UWB dipole antenna simulation models that are redesigns of the traditional single-and multi-resonant dipole structures are designed for the frequencies of interest. Then, antenna equivalent circuit model structures to be studied are chosen based on the literature review in the previous publications [3,16,18] and common circuit theory [20]. Finally, the circuit component values are defined by following the consideration of the correspondence between equivalents and physical antenna dimensions.…”

Section: Introductionmentioning

confidence: 99%

Impedance Dependency on Planar Broadband Dipole Dimensions: An Examination With Antenna Equivalent Circuits

Tuovinen¹,

Berg²

2014

PIER

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Abstract-The present paper considers the connection between complex input impedance and the physical dimensions for planar ultra wideband (UWB) antennas. The first time the effect of both the actual radiator width and length for impedance behaviour is comprehensively presented. Also the effect of feed point dimensions on complex impedance is studied. The investigations involve both UWB single-resonant dipoles to cover bandwidth ≥ 500 MHz and a multi-resonant dipole for the entire Federal Communications Commission's (FCC) frequency band of 3.1-10.6 GHz. Lumped-element equivalent circuits are used identically with 3D antenna simulations in order to observe the corresponding impedance behaviour with the studied antennas. The used equivalent circuits consisting of seriesand parallel-resonant stages are widely accepted in the open literature. The series-resonant circuit of equivalent is observed to have the analogue to the antenna feeding area. The physical dipole dimensions in terms of a length and width are connected to parallel-resonant part, which mainly determines the antenna input impedance. The resistance of a parallel-resonant stage behaves as the maximum value of real part of dipole impedance with an influence on bandwidth together with the ratio of parallel capacitance C and inductance L. The increase of the antenna physical width has an effect on bandwidth, because of the wider the antenna, the higher the capacitance in the antenna feed. Since the traditional dipoles are used for these studies, the results can be extended in several ways for other antenna types or, for instance, to verify the effect of body tissue, close to a wearable antenna.

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“…The array factor (AF) is a function of the geometry of the antenna array element and the excitation phase and it quantifies the effect of combining radiating elements in an array without the element specific radiation pattern taken into account. The array factor of an Nelement antenna array is given by (Raisanen & Lehto, 2003):…”

Section: ×8 Its Rotman Lens Microwave Bfn Design and Performancementioning

confidence: 99%

Microwave Beamforming Networks for Intelligent Transportation Systems

Rahimian¹

2012

Intelligent Transportation Systems

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Radio engineering for wireless communication and sensor applications - Book Review

Abstract: 65This is a very handy and informative book that would be useful to polymer formulators, polymer researchers, and polymer chemists who need a convenient source for the latest information on polymeric fillers and the effects fillers have on polymer properties.

Cited by 18 publications

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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

Impedance Dependency on Planar Broadband Dipole Dimensions: An Examination With Antenna Equivalent Circuits

Microwave Beamforming Networks for Intelligent Transportation Systems

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