Lukas Vojtech

Application of Shielding Textiles for Increasing Safety Airborne Systems - Limitation of GSM Interference

Increasing air traffic requires adherence to strict safety rules, including mobile technology interferences. The rules of air traffic define operator duties, e.g. restriction of using electronic devices, which can affect efficiency of board systems and equipments. An operator has to adhere to the rules. Most of airlines solve these duties by verbal or graphical warnings. The article is focused on shielding textiles utilization at special shielding textile case development, which restricts GSM mobile terminals to interfere electronic airborne systems.

Solar and wireless energy harvesting semi-active UHF RFID tag design and prototyping

In this paper we describe the main phases of an ideation, hardware design, development, prototyping and testing of UHF RFID high memory capacity TAG supported with two external independent power sources. There were used current best practices to design and build a proof of concept with two energy sources: Solar and Wireless which made the TAG battery free and semi-active. Harvested energy should help to support RFID semi-active tag whenever radio signal or light is available. Based on the parallel experience, existing research of similar projects and requirements there was decided to create our own PCB layout for tag board carrying two modules. First source is Solar panel; second one is a Wireless power receiver at frequency of 915MHz. Concerning the RFID circuit Monza Dura family chip as the main microprocessor for RFID transponder was used and a printed PCB antenna as per vendor specification to allow it to interact with remote RFID transmitter. All the system is printed on a FR4 substrate. The main goal was RFID tag reading distance extension. Than it was prototyped and tested the potential of an external power supply for the specific RFID tag based on globally available, harvesting ready RFID chip. In addition to this goal it was validated how does it influence the reading distance and if there will be a positive impact to amplification for more efficient backscatter effect to be able to improve overall Quality of Service. There is a perspective to continue with development and to add other complementary power sources, optimize their switching and management of tag functionalities as well as to fulfill extensive energy requirements for future applications.

Embedded system with RFID technology and inductive proximity sensor

Monitoring of technology processes is crucial for quality management and also for effectiveness of following logistics chain to achieve customer expectations and requirements. The control of upheavals of moulding presses often fails in using manual records. It is crucial mainly for owners moulds. The improvement is solved by RFID technology and read-write tags. This paper focuses on full description of the system which controls the number of upheavals of the moulding press. It is not based on direct recording into tags, but on clientserver application. It uses web based interface with access by mobile phone. The evaluation in real operation confirms improvement in controlling of moulds operation.

UHF RFID tag design for disaster management

This paper deals with the Ultra High Frequency (UHF) Radio Frequency Identification (RFID) tag design as a part of RFID localization system primarily designated for mass disasters. The design of RFID tag considers many casualties in an area of hundreds square meters, human body impedance, battery lifetime, maximal output power, resistant encapsulation etc. All requirements are taken into account in the design of several versions of RFID tag and the best one is chosen. Subsequently the design is manufactured and measured. Results show the designed RFID tag prototype is suitable for application in a disaster management.

Design of RFID outdoor localization system: RFID locator for disaster management

This paper presents an RFID outdoor localization system that is able to localize hundreds of active transponders in the area of one square kilometer using three RFID receiving stations. The RFID outdoor locator is designed for the tracking of casualties during mass disasters. Active transponders are included in triage tags that are fastened to all casualties during the first wave of rescue operations. Direction of arrival of each transponder and GPS position of three receiving stations determine the position of each active transponder in the area. The location of the transponder is displayed on a mobile terminal in maps. The paper describes a design and simulations of such system. The precision of localization of realized prototypes of the system is measured. The results and applications using the proposed RFID outdoor locator are discussed.

RFID Textile Antenna and Its Development

Textile fabric material has become one of the most important things in life. In early times people used to wear the animal skin to cover their body. The advance form of this is all the clothes we wear today. They protect our body from changing environment conditions and keep us warm. As the technology is increasing day by day, it is influencing every sector. With the increase in wireless technology the electromagnetic radiation also increases. This increased radiation may affect human body severely. Thus with invent of problem, cure was also proposed to make a conductive textile material that could be equally wearable but at the same time work as a filter and does not allow the harmful frequency signal to penetrate into the human body. This completely changed the purpose of fabric material which was previously assumed to be used only for keeping human body warm as now it can be used for protection against the harmful electromagnetic radiation.

Surface Area Evaluation of Electrically Conductive Polymer-Based Textiles

In this paper, the surface area of coated polymer-based textiles, i.e., copper and nickel plated woven polyester fabric, copper and acrylic coated woven polyester fabric, and copper and acrylic coated non-woven polyamide fabric, is investigated. In order to evaluate the surface area of the woven fabrics, Peirce’s geometrical model of the interlacing point and measurement using an electron microscope are used. Non-woven fabrics are evaluated using an optical method, handmade method, and MATLAB functions. An electrochemical method, based on the measurement of the resistance between two electrodes, is used for relative comparison of the effective surface area of the coated woven and non-woven fabrics. The experimental results show that the measured and calculated warp lengths do not differ within the standard deviation. The model for the surface area evaluation of the Pierce’s geometrical model for monofilament (non-fibrous) yarns is extended to multifilament yarns and to a uniform sample size. The experimental results show the increasing trend of surface area evaluation using both modeling and electrochemical methods, i.e., the surface area of the copper and acrylic coated woven Polyester fabric (PES) is the smallest surface area of investigated samples, followed by the surface area of the copper and acrylic coated non-woven fabric, and by copper and nickel plated woven PES fabric. These methods can be used for surface area evaluation of coated polymer-based textiles in the development of supercapacitors, electrochemical cells, or electrochemical catalysts.

Electromagnetic Shielding Effectiveness of Woven Fabrics with High Electrical Conductivity: Complete Derivation and Verification of Analytical Model

In this paper, electromagnetic shielding effectiveness of woven fabrics with high electrical conductivity is investigated. Electromagnetic interference-shielding woven-textile composite materials were developed from a highly electrically conductive blend of polyester and the coated yarns of Au on a polyamide base. A complete analytical model of the electromagnetic shielding effectiveness of the materials with apertures is derived in detail, including foil, material with one aperture, and material with multiple apertures (fabrics). The derived analytical model is compared for fabrics with measurement of real samples. The key finding of the research is that the presented analytical model expands the shielding theory and is valid for woven fabrics manufactured from mixed and coated yarns with a value of electrical conductivity equal to and/or higher than σ = 244 S/m and an excellent electromagnetic shielding effectiveness value of 25–50 dB at 0.03–1.5 GHz, which makes it a promising candidate for application in electromagnetic interference (EMI) shielding.

Object Localization for Determining Customer's Behavior: Auto-ID Based Approach

The paper discusses the possibilities of radio frequency identification technology for identification objects in defined space and thus determine customers behavior. This paper aims to analyze current methods of detecting movement and behavior of customer in the st ore area and to achieve the greatest automation possible with more accurate, faster processes of increased quality. The proposed system will collect a large amount of operational data, one of the objectives will also be to transform this data into information and extract the greatest possible amount of knowledge. The experiments described in this paper demonstrate feasibility and possibility of solution enabling tracking of objects in a given area.

Novel approach to shopping experience

The paper deals with application of new technologies for virtual shopping which is a part of the international project titled Internet of Things in Future Stores. The project aims to bring many novelties from the field of automatic identification and smart sensors into the shopping processes. One of the project results is also a retail store model created in 3D, designed to go through using virtual reality. The main purpose of this concept is to bring buyers a whole new look and experience of shopping compared to regular e-shops. Besides the experience for the consumer, the scientific potential is also hidden in this result. By analyzing the movement of individual shoppers in a virtual store, we can monitor their behavior, whether they shop in groups, where they look while shopping and which paths they take. Additionally, the virtual store model can be easily customized based on customer behavior analysis and serves as a product placement and arrangement of store lay out tool.