The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
This paper presents the design of a subwavelength electromagnetic band gap (EBG) isolator for a biomedical repeater device. The repeater device is meant to amplify the attenuated RF signal sent from reader antenna and retransmits it to a miniature implant sensor. The EBG isolator working at UHF RFID frequency of 900 MHz occupies an area of 3.1 cm × 2 cm. It increases isolation between orthogonal loops...
A fully wireless implantable system can be used for long-term monitoring of intracranial pressure. In this type of system, an implant is placed under the skull and monitored pressure is transmitted wirelessly outside the skull. Moreover, the implant is powered through an inductive coupling. To avoid any infection and damage to the implant, the implant should be coated with biocompatible material....
An implantable pressure monitoring system is a compelling approach to home monitoring of intracranial pressure in the long term. In our approach, an on-body unit powers a cranially concealed system where a piezoresistive element senses the pressure. A data transmission unit built in the same platform emits a signal at a pressure dependent frequency through a miniature far field antenna. In this work,...
This paper presents the pressure readout results from a piezoresistive pressure sensor in a biological environment mimicking the human head properties for intracranial pressure (ICP) monitoring application. The piezoresistive pressure sensor is powered wirelessly through inductively coupled antennas. After successful activation of the sensor, the pressure readout is demonstrated from 0 mmHg to 30...
We analyze the structure of the level sets of voltage gain and transducer power gain in two-port systems and based on the findings, present a semi-analytical method for finding the minimum values of these quantities as the port terminations vary in bounded rectangles in the complex plane. This provides a numerically efficient way to assess the impact of variability in the port terminations to the...
We attest the feasibility of a textile antenna in remote powering of a piezoresistive pressure sensor through inductive coupling for monitoring of intracranial pressure. The textile antenna made of metallized fabric on light-weight cell foam rubber substrate. Simulated and measured results of the wireless link performance along with measured output voltage versus pressure are presented.
Due to the massive increase in the number of wireless devices, studying the use of cost-effective and environmental-friendly materials to be used together with effective additive manufacturing methods has been a growing trend in electronics during the recent years. Especially graphene materials have a huge potential to revolutionize the fabrication of wireless electronics. In this paper, passive graphene,...
This paper presents a design of a 23-DOF small humanoid robot with force sensors for zero moment point (ZMP) measurement. Piezoresistive strain gauges are used under the feet of the robot to measure ground reaction force which is used to locate ZMP under the robot foot support area. The robot also uses gyroscope and acceleration sensor for motion control.The robot developed is capable of all directional...
The performance of amplitude- and phase-based passive direction finding (DF) systems is evaluated in a multi-path environment. For performance analysis and fair comparison, a parametric circular DF array is modelled and analyzed in a two-wave (direct and reflected) environment. The parameterized model varies the aperture size and number of antenna elements of DF array, frequency, strength and angle-of-incidence...
In this paper, we propose a software defined reconfigurable digital beam forming (DBF) system. The system produces 43-degrees beam-width with 22.7 dB main-to-side-lobe ratio (MSLR) and steer the beam with beam pointing accuracy of ±2 degrees with just 4 element antenna array. The proposed system is realized on the latest field programmable gate arrays (FPGA) and digital signal processor (DSP). One...
This paper presents the performance evaluation of a circularly polarized wearable antenna on flexible Ethylene Propylene Diene Monomer (EPDM) foam substrate. EPDM is a rubber based material with high flexibility, good shock resistance and easy attachment to any curved surface. The designed antenna operates for Industrial, Scientific and Medical (ISM) band and Wireless Body Area Network (WBAN) applications...
We analyze a two-turns antenna to provide power wirelessly to 2×2×2 mm3 cubic cortical implant. We present simulation of available power and voltage to the implant and assess the impact of a inserting a magnetic core in the antennas for further performance enhancement. We have fabricated the studied antennas and verified the simulated link power efficiency through measurement in a liquid phantom.
Real Time Kinematic (RTK) Global Positioning System (GPS) uses carrier phase measurement from GPS signal and it has a high accuracy but has integer ambiguity resolution problem which causes cycle slips and requires good satellite visibility as well. RTK was originally developed for applications such as surveying; in our case the target application is the tracking and the control of a robot hexacopter...
In this work, coordination of energy trading and unidirectional vehicle to grid services taking into account generation emissions is considered. The study has investigated the case of a Load Serving Entity (LSE) with owns a number of wind and thermal generation units and has to cater a certain amount of load with large concentration of a special controllable load, Electric Vehicles (EVs). The objective...
In Fixed Wireless Applications (FWA), the Direct Sequence Code Division Multiple Access (DS-CDMA) is the most promising candidate for wideband data access. The reason is the high throughput and soft limit on the number of active mobile devices. Soft limit on the network capacity means degradation of the performance by increasing the number of mobile devices. In many Fixed Wireless Applications, it...
A fractal monopole antenna based on the Sierpinski gasket is studied in this paper. The monopole antenna based on the Sierpinski gasket constructed through three iterations displays a multiband behaviour with three bands that are log-periodically spaced by a factor of 2, the same scale factor that defines the geometrical self-similarity of the Sierpinski fractal. The simulated as well as measured...
The SONET systems are faster than the other optical network but there is a problem of allocation of static channels to the users. If one of the users is in idle condition the channel remains unused through out the whole process of frame transmission, this problem decreases the efficiency of the SONET system. In order to overcome this deficiency it is required to design the allocation of the channels...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.