Browsing Electrical & Electronics Engineering by Author "(ORCID 0000-0001-8549-2582 & YÖK ID 143103) Tekin, Ahmet"
Now showing items 1-15 of 15
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16-elements helical antenna system integration with a solar cell powered IoT collector
Ullah, Naveed; Tekin, Ahmet (IEEE, 2019)An 868MHz-915MHz 16-elements helical wire antenna array design with a solar-cell integration is presented. Each element is designed to be omni-directional with the corresponding tuning stubs and ground substrate. This is ... -
A 1GS/s, 9-bits DAC interleaved (2+1)-bit then 2-bit per cycle SAR ADC
El-Sawy, Salma; Tekin, Ahmet (Istanbul University, 2020-07)This paper presents a high speed Successive Approximation Register Analog to Digital Converter (SAR ADC) for low-noise low-power satellite transceiver applications. The system is a (2+1) then 2-bit per cycle SAR ADC of ... -
Adaptive 6.78-MHz ISM band wireless charging for small form factor receivers
Abouzeid, Mohamed Osama Hussein Soliman; Tekin, Ahmet (IEEE, 2017)This paper presents a low cost wireless power transfer system tailored particularly for size limited insulation sealed wearable devices. The 5-V USB input system features a crystal oscillator as reference signal source, a ... -
Class E resonant converter design for LED drivers
Zengin, Ö. Ö.; Boztepe, M.; Tekin, Ahmet (IEEE, 2019-06)The LED (Light Emitting Diode) lighting technology has been becoming widespread rapidly due to having advantages such as extremely long lifetime, compact structure and very low energy consumption. In the literature, various ... -
Design and kinematics of 4- DoF multi-purpose wearable mechanical arm (MUWA) support for enhanced operation stability
Nomanfar, P.; Tekin, Ahmet; Bogosyan, S.; Şendur, Polat (IEEE, 2019)A low-cost motor-less simple wearable mechanical arm support unit is presented as a viable alternative to todays assistive exoskeleton support units. By limiting the functionality of the device to stabilization rather than ... -
Design and simulation of microfluidic device for metabolite screening and quantitative monitoring of drug uptake in cancer cells
Asif, Afia; Khawaldeh, S.; Khan, Muhammad Salman; Tekin, Ahmet (Sciendo, 2018)Although liquid-liquid extraction methods are currently being applied in many areas such as analytical chemistry, biochemical engineering, biochemistry, and biological applications, accessibility and usability of microfluidics ... -
The design of a high gain dual-polarized quad-ridged circular horn antenna for wideband EMC test applications
Solak, Bekir; Seçmen, M.; Tekin, Ahmet (The Applied Computational Electromagnetics Society, 2018-09)This paper presents the design of a high gain broadband quadruple-ridged circular horn antenna for Electromagnetic Compatibility (EMC) testing. The proposed antenna contains a wideband feed structure as a transition between ... -
Dopamine detection using mercaptopropionic acid and cysteamine for electrodes surface modification
Khan, Muhammad Salman; Asif, Afia; Khawaldeh, S.; Tekin, Ahmet (Sciendo, 2018)Gold electrodes are often not suitable for dopamine measurements as dopamine creates a non-conducting polymer layer on the surface of the electrodes, which leads to increased amount of electrode passivity with the gradual ... -
An experimental study of a bluetooth communication system for robot motion control
Dalgiç, Oğuzhan; Tekin, Ahmet; Uğurlu, Regaip Barkan (IEEE, 2019)This paper presents a method that aims to reduce the complex cabling problem in robotics applications, so as to prevent difficulties in troubleshooting processes and failures in case of cable breaks. Examples in the ... -
An improved speed controller for PMSM drive with unbalanced load using load torque observer
Yoldaş, Koray; Tekin, Ahmet; Boztepe, M. (IEEE, 2019)In order to overcome disturbance effects as load torque variations in Permanent Magnet Synchronous Motor (PMSM) of washing machines, an improved controller with feed forward compensation is presented in this paper. A few ... -
Low-cost thin-film passive RFID circuits and detector system
El-Sawy, Salma; Nawaz, Wasim; Abouzeid, Mohamed Osama Hussein Soliman; Tekin, Ahmet (Cambridge University Press, 2020-06)This paper discusses the design of chip-less RFID tags of a standard pocket size of 69 mm by 156 mm. These tags are based on lumped elements of copper metal traces constructed on a thin polyamide flexible substrate. Moreover, ... -
Resonance-filtering combo system for continuous wireless charging range coverage
Sağlam, Üstün; Tekin, Ahmet (Cambridge University Press, 2020-09)Distribution of wireless power charging field uniformly on a large area pad is critical for power receivers, particularly for wearable devices, wherein small form factor coils are involved. Since the receiver coil size is ... -
A robust voltage control method for universal EV battery charger LLC resonant converters
Daş, Y.; Tekin, Ahmet; Boztepe, M.; Tarhan, C. (IEEE, 2019)In this study, a novel control method for LLC resonant converter with wide output voltage range and constant switching frequency is proposed targeting wide range of Electric Vehicle (EV) battery charger standards. In ... -
A sub-sampling pulse-resonance OOK modulated digital ultrasound communication system for biomedical IoT
Abouzeid, Mohamed Osama Hussein Soliman; Tekin, Ahmet; Mohieldin, A. N. (Elsevier, 2019-11-01)A pulse-resonance On-Off keying ultrasound communication microsystem is presented. It is a viable alternative to today's widely used RF technologies in order to avoid the associated health risks for a specific group of ... -
Total harmonic distortion and power factor improvement technique for CRM flyback PFC converters
Kavcı, Mustafa; Tekin, Ahmet; Tarhan, C. (IEEE, 2019)In many of today's solid-state lighting applications, Critical Conduction Mode (CCM) Flyback PFC converter is a popular solution due to its limited component count and simple structure with respect to other SMPS topologies. ...
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