Browsing by Author "Ozbakis, Basak"

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Citation - WoS: 1
A Numerical Parametric Study of SAR from a Dual-Band PIFA Based Antenna for Mobile Communication
(IEEE, 2017) Serdar Okuyucu; Mustafa Secmen; Korkut Yegin; Basak Ozbakis; Ozbakis, Basak; Secmen, Mustafa; Yegin, Korkut; Ozbakts, Basak; Okuyucu, Serdar
Specific Absorption Rate (SAR) analysis is a vital part of compliance tests for commercial mobile phones performed in accordance with the set of comprehensive standardized practices provided by authoritative bodies. Dependence of SAR on a variety of parameters with the structure of the handset pronounced the most calls for bringing in the SAR analysis of various types of phones into the field of study for reference. This paper focuses on the SAR analysis of a PIFA based mobile phone antenna when operated next to standardized and anatomically correct head models. The effect of averaging method used positioning of the phone frequency of operation and the presence of a homogeneous hand model on SAR is investigated along with the antenna performance in terms of terminal and radiational characteristics.
Citation - Scopus: 1
Multi-band frequency tunable LTE antenna for mobile phone applications
(Electromagnetics Academy chew@jpier.org Suite 207777 Concord Avenue Cambridge MA 02138 USA 02138 Massachusetts, 2017) Basak Ak Ozbakis; Serdar Okuyucu; Mustafa Seçmen; Korkut Yeǧin; Ozbakis, Basak; Secmen, Mustafa; Yegin, Korkut; Okuyucu, Serdar; W.C. Chew , S. He , S. He
The progress shown in mobile phone technology in dealing with multiple band transmission and high data transmission rates has been followed by an increased demand in favor of rich content mobile services and new functionalities. To provide these services multi-band and wide-band antennas have to be integrated into the compact structure of modern mobile phones. In this paper as part of the results of a research project we propose a multi-band frequency reconfigurable main antenna along with a receive diversity antenna for use in 4G (4th generation) mobile terminals. The main antenna is a Planar Inverted F Antenna (PIFA) mounted on bottom of the mobile phone and grounded by a variable reactance for operation in 790-960 MHz and 1710-2690 bands covering GSM DCS PCS and UMTS standards. The receive diversity antenna on the other hand is a monopole antenna to be operated in the 1710-2690 MHz band. Use of LDS (laser direct structuring) structure in both antennas are proposed for fine-tuning of their response. Simulated frequency responses of reflection coefficients and radiation patterns of the prototype antennas are given. © 2018 Elsevier B.V. All rights reserved.
Citation - WoS: 1
Parametric SAR Study for 4G Cellular Phone Applications
(IEEE, 2018) Serdar Okuyucu; Korkut Yecin; Mustafa Secmen; Basak Ozbakis; Yecin, Korkut; Ozbakis, Basak; Secmen, Mustafa; Okuyucu, Serdar
Multiple-Input Multiple-Output antenna structures in mobile terminals constitute an important part of advanced LTE communication services employing carrier aggregation in serving users with multiple band transmission at high data rates. In that sense 4G/LTE system utilize at least two-antenna diversity system for mobile communication. Considering factors such as the move towards cloud computing and online storage of information in cloud services requiring both receive and transmit modes of operation in multiple bands mobile phones with two antennas often raise the issue of specific absorption rate in diversity antenna operation. In this study SAR characteristics of a PIFA antenna element is investigated as the cellular antenna when operated next to a standard specific anthropomorphic mannequin head model in various relative positioning of antenna and mobile terminal. In conclusion while the opposite does not raise a concern positioning the antenna on the upper part of the phone was seen to degrade the terminal and radiational characteristics of the antenna and produce average SAR values higher than standard maximums at the operational 4G frequencies of 2.1 and 2.6 GHz. Relatively low SAR values are obtained for 10g averaging scheme and tilted holding position.