Abiodun Komolafe

Abiodun Komolafe
University of Southampton · Faculty of Physical and Applied Sciences

Doctor of Engineering

About

46
Publications
7,277
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
349
Citations

Publications

Publications (46)
Conference Paper
Full-text available
It is often necessary to connect e-textile devices with power supplies and other peripherals using electrical wires. This connection is usually achieved with the use of wires that are consequently bonded to the e-textile circuit using conductive epoxies or solders. This paper reports the mechanical failures that arise from this bonded joint during...
Article
Full-text available
Despite an increasing interest in wearable wireless power transmission (WPT), until now, wearable antennas have been unable to simultaneously harvest from near-field resonant and far-field radiative WPT. Here, a dual-port antenna is proposed, integrating an inductive coil with a broadband monopole for near-and far-field wearable WPT. The coil acts...
Conference Paper
While far-field wireless power transfer (WPT)promises a long range of operation, it falls short on the DC powerwhich can be provided. On the other, hand resonant near-fieldWPT suffers from a short wireless range. In this work, a dual mode high/low-power near/far-field rectenna is demonstrated for the first time based on a flexible rectifier and a t...
Conference Paper
Near-field radiative Wireless Power Transfer (WPT)has the advantage of high-power WPT. In this paper, an all textile high-power WPT receiver is realized for the first time, using an embroidered coil and a printed tuning capacitor on a textile substrate. The proposed coil is demonstrated receiving over 3 W DC power at 6.78 MHz with a 23% end-to-end...
Article
Full-text available
In this paper, a novel multi-layered microstrip line with built-in parallel-plate capacitors is proposed for DC-blocking applications, with its transmission characteristics measured up to 50 GHz. The microstrip lines are fabricated via screen printing directly onto polyurethane films laminated on standard textile substrates which would otherwise be...
Article
Conductive tracks are key constituents of wearable electronics and e-textiles, as they form the interconnective links between wearable electrical devices/systems. They are made by coating or printing conductive patterns or tracks on textiles or by weaving, knitting, or embroidering conductive yarns into textiles. Screen printing is a mature and cos...
Article
Full-text available
Wearable devices are ideal for personalized electronic applications in several domains such as healthcare, entertainment, sports and military. Although wearable technology is a growing market, current wearable devices are predominantly battery powered accessory devices, whose form factors also preclude them from utilizing the large area of the huma...
Article
During the fabrication of printed e-textile devices, it is often necessary to print a low-cost polymer interface layer to level the surface of the fabrics. The typical thickness of this interface layer is usually greater than the thickness of the fabric. This significantly affects the flexibility and wearability of the printed e-textile. This paper...
Conference Paper
Direct-write dispenser printing represents a simple solution to rapid flexible and printed electronics prototyping and low-volume manufacturing. This work presents the design, fabrication and evaluation of magnetic resonance wireless power transfer (WPT) coils fabricated using dispenser printing. A double-sided inductor is designed and printed on a...
Conference Paper
To achieve durable printed circuits on textiles, it is necessary to print low-cost polymer films that interface the fabric with the printed circuit. The film smooths the surface of the fabric to enable the printing of thin and flexible conductive films on the fabric. When printed, the thickness of the polymer films can dominate the fabric and limit...
Conference Paper
We have realised a wireless battery free smart bandage for home and hospital use to monitor skin wound temperature and humidity. The smart bandage is powered wirelessly by Radio Frequency (RF) energy based on Near- Field Communication (NFC) Radio-Frequency Identification (RFID) technology which also communicates the measured temperature and humidit...
Article
Full-text available
This paper details the design, fabrication and testing of flexible textile-concealed Radio Frequency Identification (RFID) tags for wearable applications in a smart city/smart building environment. The proposed tag designs aim to reduce the overall footprint, enabling textile integration whilst maintaining the read range. The proposed RFID filament...
Article
Full-text available
The design of dynamic wearable wireless power transfer systems (WPT) possesses multiple challenges that affect the WPT efficiency. The varying operation conditions, such as the coils coupling, and operation in proximity or through the human body, can affect the impedance matching at the resonant frequency. This paper presents a high-efficiency wear...
Conference Paper
Full-text available
Wireless power transfer (WPT) and Radio Frequency (RF) energy harvesting (EH) are increasingly seen as an enabling technology for power-autonomous Internet of Things (IoT) [1, 2]. RFEH and WPT are a particularly attractive power source for flexible, printed, and e-textile systems due to their compatibility with standard fabrication processes, aboli...
Conference Paper
WEARPLEX is a multidisciplinary research and innovation action with the overall aim to integrate printed electronics with flexible and wearable textile-based biomedical multi-pad electrodes. It aims to answer the growing need for user-friendly electrodes for pervasive measurement of electrophysiological signals and application of electrical stimula...
Article
Full-text available
Achieving a wireless power transfer (WPT) link insensitive to separation is a key challenge to achieving power autonomy through wireless-powering and wireless energy harvesting over a longer range. While coupled WPT has been widely used for near-field high-efficiency WPT applications, the efficiency of the WPT link is highly sensitive to separation...
Article
Full-text available
The weaving of flexible electronic filaments directly into the body of textiles during manufacture represents the state-of-the-art process for integrating electronic functionality into fabrics in a manner that obscures the presence of the electronics from the wearer. The reliability of emerging prototypes under typical stresses from washing and ben...
Article
Full-text available
This paper proposes an integrated smart cycling system for assisted cycling, energy harvesting and wireless power transfer systems on a bicycle, an enabling platform for autonomous e-textiles-based sensing. The cyclist is assisted by a switched reluctance motor, which also acts as a switched reluctance generator that harvests a peak power of 7.5 W,...
Article
Full-text available
The degree of pollution in the environment increases because of the vehicular emissions such as carbon monoxide (CO) and nitrogen dioxide (NO2) gases. To minimize the exposure levels, it is necessary for individuals to be able to determine for themselves the pollution levels of the environments they are in so that they can take the necessary precau...
Conference Paper
Full-text available
The degree of pollution in the environment increases because of the vehicular emissions such as carbon monoxide (CO) and nitrogen dioxide (NO2) gases. To minimize the exposure levels, it is necessary for individuals to be able to determine for themselves the pollution levels of the environments they are in so that they can take the necessary precau...
Conference Paper
Coupled wireless power transfer (WPT) has been widely used for near-field high-efficiency WPT applications. However, the efficiency of the WPT link is highly sensitive to separation and alignment, and is prone to over-coupling, making it unsuitable for mobile systems with unknown or loose coupling such as wearables. While ultra-high frequency (UHF)...
Conference Paper
The weaving of flexible electronic filaments directly into the body of textiles during manufacture represents the state of the art process for integrating electronic functionality into fabrics in a manner that obscures the presence of the electronics from the wearer. The reliability of emerging prototypes under typical stresses from washing and ben...
Poster
Full-text available
This paper proposes an integrated smart cycling system for assisted cycling, energy harvesting and wireless power transfer systems on a bicycle, an enabling platform for autonomous e-textiles-based sensing. The cyclist is assisted by a switched reluctance motor, which also acts as a switched reluctance generator that harvests a peak power of 7.5W,...
Poster
The degree of pollution in the environment increase due to the vehicular emissions such as carbon monoxide and nitrogen dioxide gases. To minimize the exposure levels, it is necessary for individuals to be able to determine for themselves the pollution levels of the environments they are in so that they can take the necessary precautions. Textile b...
Conference Paper
Full-text available
This paper proposes an integrated smart cycling system for assisted cycling, energy harvesting and wireless power transfer systems on a bicycle, an enabling platform for autonomous e-textiles-based sensing. The cyclist is assisted by a switched reluctance motor, which also acts as a switched reluctance generator that harvests a peak power of 7.5W,...
Conference Paper
This presentation introduced the concept of the woven electronic circuits developed at the University of Southampton. It described the photolithographic manufacturing processes involved and the methods used to create the circuit designs to create the ‘strip circuits’ used in the work. Several examples of the robustness of the devices were given as...
Conference Paper
This was the introductory presentation that set the scene for the following talks which focused on specific technologies and expertise of each consortium member. The audience was introduced with the WEARPLEX concept and vision, as well as the profiles of consortium members and their roles in the project. The talk was more oriented towards the domai...
Article
Hydrogen technology is essential to the decarbonisation of global economies because it addresses the variability and storage limitation of renewable energy. Several research literatures on hydrogen technology have focused on energy systems with minimum attention given to other fossil fuel driven sectors such as chemical and material production. For...
Poster
Temperature measurements are useful in the monitoring of foot ulcer and wound infections of diabetic patients, changes in skin or ambient temperatures and cardiovascular health evaluations for health applications. For improved wearability, e-textile garments design for such applications often require the temperature sensors to be completely enclose...
Article
Full-text available
Practical wearable e‐textiles must be durable and retain, as far as possible, the textile properties such as drape, feel, lightweight, breathability, and washability that make fabrics suitable for clothing. Early e‐textile garments were realized by inserting standard portable electronic devices into bespoke pockets and arranging interconnects and c...
Article
Electronic textiles (e-textiles) are an emerging technology comprised of electronic circuit systems embedded into the fabric using traditional textile techniques such as knitting and weaving. Such systems can be formed using off-the-shelf passive components and integrated circuits (ICs) available commercially. An e-textile switching mechanism can b...
Article
Full-text available
Wider adoption of electronic textiles requires integration of small electronic components into textile fabrics, without comprising the textile qualities. A solution is to create a flexible yarn that incorporates electronic components within the fibres of the yarn (E-yarn). The production of these novel E-yarns was initially a craft skill, with the...
Conference Paper
p>This paper summarizes the research at the University of Southampton towards integrated autonomous electronic textiles (e-textiles). Textiles are difficult materials to work with due to their surface roughness and pilosity, and the constraints they impose on the processing of materials such as low-temperature curing. Powering autonomous e-textiles...
Article
Fabrics are stiff in tension but highly compliant in compression in the plane of the textile. The effect of these differing elastic properties on the durability of electronics integrated in or on the fabric is still largely unknown because fabric properties are not easily characterized. Using a mathematical model combining classical beam theory (CB...
Conference Paper
p>The integration of small electronic components into textile fabrics, without compromising the textile qualities such as flexibility and conformability, is necessary in ensuring wider adoption of electronic textiles. A solution is to use flexible, electronic yarns that incorporate electronic components within the fibers of the yarn. The production...
Article
A novel packaging method that enables the reliable mounting and protection of bare die within a textile yarn has been investigated. The reliability of electronic textiles is highly challenging given the flexibility of the fabric and the rigours of typical applications. Achieving reliable operation requires novel packaging approaches. In order to ma...
Article
Full-text available
This paper reports the experimental investigation of the durability of screen printed conductor-based strain gauges on four fabrics of different stiffness by examining the change in the electrical resistances during and after bending. Emphasis is placed on improving the durability of the gauges for both positive and negative bending e-textile appli...
Conference Paper
Full-text available
This paper reports the experimental investigation of the durability of screen printed conductor-based strain gauges on four fabrics of different stiffness by examining the change in the electrical resistances during and after bending. Emphasis is placed on improving the durability of the gauges for both positive and negative bending e-textile appli...
Article
This paper details the enhancements in the dielectric and piezoelectric properties of a low-temperature screen-printable piezoelectric nano-composite film on flexible plastic and textile substrates. These enhancements involved adding silver nano particles to the nano-composite material and using an additional cold isostatic pressing (CIP) post-proc...
Thesis
E-textiles are specially engineered textiles that perform intelligent functions such as sensing and actuation. They find useful applications in medicine, the military, fashion and entertainment. However the durability of these textiles is limited by mechanical failure resulting in degradation of the electrical performance of the electronic circuits...
Article
This paper introduces a new flexible lead zirconate titanate (PZT)/polymer composite material that can be screen-printed onto fabrics and flexible substrates, and investigates the clamping effect of these substrates on the characterization of the piezoelectric material. Experimental results showed that the optimum blend of PZT/polymer binder with a...
Conference Paper
Screen-printed interconnections are one example of interconnect technology that is currently being developed for e-textiles. The simplicity in the fabrication process and the high degree of design freedom it affords, allow electronic circuits to be easily realized on a textile host. Nonetheless, these interconnects often lose their electrical condu...

Network

Cited By