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Proceedings Article

Compact and conformal ultra wideband antenna for wearable applications

TL;DR: In this article, the characteristics of a compact and conformal ultra wideband (UWB) antenna fabricated on Liquid Crystal Polymer (LCP) substrate to be used in wearable applications are presented.
Abstract: This paper presents the characteristics of a compact and conformal ultra wideband (UWB) antenna fabricated on Liquid Crystal Polymer (LCP) substrate to be used in wearable applications. The presented return loss and radiation pattern measurements demonstrated that the characteristics of the antenna are not compromised when the antenna is bent or even folded. The antenna shows similar and reliable electrical and mechanical performances in wearable electronics, where their planar condition cannot be guaranteed. The antenna's ability to work under adverse environments (i.e. under heating and in water) are also investigated and negligible impact of these conditions on antenna performance promises the use of such antenna in wearable applications.
Citations
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Journal ArticleDOI
TL;DR: This article presents a new design of an ultra-wideband conformal antenna for Unmanned Aerial Vehicle (UAV) applications which is a low-profile structure which is very suitable to diminish aerial vehicle drag problem.
Abstract: This paper was supported by the Mexican Council for Science and Technology (CONACyT), under Grant no. 2016-01-1680.

39 citations


Cites background from "Compact and conformal ultra wideban..."

  • ...Additionally, a conformal antenna was also proposed for wearable applications in [14]....

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Proceedings ArticleDOI
26 Mar 2012
TL;DR: In this paper, a conformal textile antenna structure is presented for wearable personal area networks in civil, medical, sport wear and military domains, which can replace wired communication networks in the near future in which antennas play a paramount role.
Abstract: In this article, a novel and compact super wide band (SWB) conformal textile antenna structure is presented. The increasing interest in wearable personal area networks in civil, medical, sport wear and military domains promises to replace wired — communication networks in the near future in which antennas play a paramount role. In this antenna, the substrate is made from jeans material while patch and ground is made out of copper tape. This antenna resonates at frequencies from 1.8GHz to 23.8 GHz. Here, the performance of this antenna in terms of resonance frequency fluctuations, return loss and radiation pattern deformation at different bending angles is observed as well.

21 citations


Cites background from "Compact and conformal ultra wideban..."

  • ...[1] UWB antennas for body-centric wireless communications as well as the bending effect of these antennas have been presented extensively in the open literature recenty[1-2]....

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Journal ArticleDOI
TL;DR: An approximately linear relation between temperature and textile’s dielectric constant is shown, giving to fabric-based antennas temperature sensing properties with capability up to 1 degree Celsius at millimeter-wave frequencies.
Abstract: Seamless integration of electronics within clothing is key for further development of efficient and convenient wearable technologies. Therefore, the characterization of textile and fabric materials under environmental changes and other parametric variations is an important requirement. To our knowledge, this paper presents for the first time the evaluation of dielectric characterization over temperature for non-conductive textiles using resonating structures. The paper describes the effects of temperature variations on the dielectric properties of non-conductive fabrics and how this can be derived from the performance effects of a simple microstrip patch antenna. Organic cotton was chosen as the main substrate for this research due to its broad presence in daily clothing. A dedicated measurement setup is developed to allow reliable and repeatable measurements, isolating the textile samples from external factors. This work shows an approximately linear relation between temperature and textile’s dielectric constant, giving to fabric-based antennas temperature sensing properties with capability up to 1 degree Celsius at millimeter-wave frequencies.

20 citations


Cites background from "Compact and conformal ultra wideban..."

  • ...Different options for dielectric materials arise for building flexible wearable antennas, such as several types of papers, Kapton, polyethylene terephthalate (PET) [22], polydimethylsiloxane (PDMS) [23], liquid-crystal polymer (LCP) [24] and textiles [25]....

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01 Jan 2013
TL;DR: The review presented here intended to disclose the unconventional antenna technology including UWB technology for wearable applications, keeping in mind background of UWBTechnology, the wearable antenna, and specification of the antenna, material for the antenna and analysis that must be done to design proper UWB wearable antennas for various applications.
Abstract: There has been a tremendous rumble in UWB research after the U.S. Federal Communications Commission (FCC) allocated a frequency range with a bandwidth of 7.5 GHz from 3.1–10.6 GHz for UWB applications. Ultra wideband (UWB) technology was earlier limited to special applications, primarily in the military area and there primarily to electronic warfare. The antennas were usually horn antennas or modified, ridged horn antennas, sometimes in combination with reflectors. Wearable intelligent textile system is an innovative fast growing field in application oriented field. In recent years, body-centric wireless communication becomes an important part of fourth generation mobile communication systems (4G). Utilization of wearable textiles in the antenna segment has been seen on the rise due to the recent miniaturization of wireless devices. Wearable and fabric-based antennas have become one of the dominant research topics in antennas for body-centric communications. The review presented here intended to disclose the unconventional antenna technology including UWB technology for wearable applications. Contributions by various researchers have been compiled keeping in mind background of UWB technology, the wearable antenna, and specification of the antenna, material for the antenna and analysis that must be done to design proper UWB wearable antennas for various applications.

15 citations


Additional excerpts

  • ...4: Compact UWB antenna proposed by [37]...

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Journal ArticleDOI
TL;DR: In this paper, three designs of textile antennas, namely, a rectangular microstrip patch antenna, annular slot antenna, and planar inverted-F antenna (PIFA), operating in the 2.45 GHz WLAN band were developed for smart clothing applications.
Abstract: Abstract In this work, three designs of textile antennas, namely, a rectangular microstrip patch antenna, annular slot antenna, and planar inverted-F antenna (PIFA), operating in the 2.45 GHz WLAN band were developed for smart clothing applications. Conductive textile, a copper-plated polyester fabric, was used for fabricating antenna radiators and grounds. An insulating neoprene fabric with a thickness of 4 mm and a permittivity of 1.5 was used for preparing the substrates. The textile patch antenna achieved a maximum gain of 5.96 dBi and a bandwidth of 4.6%. The annual slot antenna showed a moderate gain and bandwidth of 2.9 dBi and 13.1%, respectively. The PIFA achieved the widest bandwidth of 31% but the smallest gain of 1.2 dBi. Furthermore, the performance deterioration of the proposed antennas under various bending conditions was analyzed to evaluate their suitability for wearable applications. Moreover, two 2 × 2 patch and slot antenna arrays were assembled to increase gain and bandwidth. The measured results proved that the developed antenna designs provide superior performance.

15 citations

References
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01 Jan 2006
TL;DR: In this article, on-body propagation modeling has been investigated applying various numerical computational techniques, and propagation measurements with body-worn antennas have been carried out at 2.4 GHz inside and outside an anechoic chamber respectively for narrowband communication channel characterisation.
Abstract: In this paper, on-body propagation modelling has been investigated applying various numerical computational techniques. Propagation measurements with body-worn antennas have been carried out at 2.4 GHz inside and outside an anechoic chamber respectively for narrowband communication channel characterisation. Both simulation and measurement results have been also obtained at the UWB (ultra wide-band) band.

652 citations

Journal ArticleDOI
TL;DR: In this article, the dielectric properties of liquid crystal polymer (LCP) have been investigated for millimeter-wave frequency bands at different LCP substrate thicknesses, and various transmission lines are fabricated on different thicknesses and the loss characteristics are given in decibels per centimeter.
Abstract: Liquid crystal polymer (LCP) is a material that has gained attention as a potential high-performance microwave substrate and packaging material. This investigation uses several methods to determine the electrical properties of LCP for millimeter-wave frequencies. Microstrip ring resonators and cavity resonators are measured in order to characterize the dielectric constant (/spl epsi//sub r/) and loss tangent (tan/spl delta/) of LCP above 30 GHz. The measured dielectric constant is shown to be steady near 3.16, and the loss tangent stays below 0.0049. In addition, various transmission lines are fabricated on different LCP substrate thicknesses and the loss characteristics are given in decibels per centimeter from 2 to 110 GHz. Peak transmission-line losses at 110 GHz vary between 0.88-2.55 dB/cm, depending on the line type and geometry. These results show, for the first time, that LCP has excellent dielectric properties for applications extending through millimeter-wave frequencies.

542 citations


"Compact and conformal ultra wideban..." refers background in this paper

  • ...UWB antennas for body-centric wireless communications has been presented extensively in the open literature [3]–[7]....

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  • ...002 [3], which makes LCP an ideal choice for circuits operating in different conditions and environments....

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Journal ArticleDOI
TL;DR: In this paper, two approaches for describing the time-domain performance of an antenna were described, one of which uses the transfer function, a function which describes the amplitude and phase of the response over the entire frequency spectrum, and the other one uses time domain parameters, such as efficiency, energy pattern, receiving area, etc.
Abstract: Frequency-domain concepts and terminology are commonly used to describe antennas. These are very satisfactory for a CW or narrowband application. However, their validity is questionable for an instantaneous wideband excitation. Time-domain and/or wideband analyses can provide more insight and more effective terminology. Two approaches for this time-domain analysis have been described. The more complete one uses the transfer function, a function which describes the amplitude and phase of the response over the entire frequency spectrum. While this is useful for evaluating the overall response of a system, it may not be practical when trying to characterize an antenna's performance, and trying to compare it with that of other antennas. A more convenient and descriptive approach uses time-domain parameters, such as efficiency, energy pattern, receiving area, etc., with the constraint that the reference or excitation signal is known. The utility of both approaches, for describing the time-domain performance, was demonstrated for antennas which are both small and large, in comparison to the length of the reference signal. The approaches have also been used for other antennas, such as arrays, where they also could be applied to measure the effects of mutual impedance, for a wide-bandwidth signal. The time-domain ground-plane antenna range, on which these measurements were made, is suitable for symmetric antennas. However, the approach can be readily adapted to asymmetric antennas, without a ground plane, by using suitable reference antennas. >

329 citations


"Compact and conformal ultra wideban..." refers methods in this paper

  • ...been measured for all ten locations for three orientations of antenna using reference pulse [10] (as shown in fig....

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Book
01 Sep 2021
TL;DR: In this paper, on-body propagation modeling has been investigated applying various numerical computational techniques, and propagation measurements with body-worn antennas have been carried out at 2.4 GHz inside and outside an anechoic chamber respectively for narrowband communication channel characterisation.
Abstract: In this paper, on-body propagation modelling has been investigated applying various numerical computational techniques. Propagation measurements with body-worn antennas have been carried out at 2.4 GHz inside and outside an anechoic chamber respectively for narrowband communication channel characterisation. Both simulation and measurement results have been also obtained at the UWB (ultra wide-band) band.

226 citations


"Compact and conformal ultra wideban..." refers background in this paper

  • ...UWB technology provides a very high data rate while transmitting low-power short pulses that gives rise to late time of arrival, when considering multipath components in an indoor environments, which features some distinctive properties that makes it attractive for various wireless wearable applications [ 1 ], [2]....

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Journal ArticleDOI
TL;DR: Fidelity analysis is applied to evaluate the time-domain behavior of body-worn antennas and it is found that average fidelity obtained is 88% and 86% for the conventional coplanar waveguide fed antenna and the tapered slot antenna, respectively, however, the tapeed slot antenna shows a significant size reduction and hence is suited for body-centric wireless communications.
Abstract: This paper presents transient characterization of ultrawideband (UWB) body-worn antennas and on-body radio propagation channels for body-centric wireless communications. A novel miniaturized CPW-fed tapered slot antenna is proposed and used for transient measurements of UWB radio channels for body area network (BAN) and personal area network (PAN) scenarios. Unlike conventional UWB CPW-fed antennas, the proposed antenna employs two diverging tapered slots to provide smooth and stable impedance matching. Fidelity analysis is applied to evaluate the time-domain behavior of body-worn antennas and it is found that average fidelity obtained is 88% and 86% for the conventional coplanar waveguide fed antenna and the tapered slot antenna, respectively. However, the tapered slot antenna shows a significant size reduction and hence is suited for body-centric wireless communications.

200 citations