Elektronik ve Otomasyon Bölümü
Department of Electrical and Automation
https://hdl.handle.net/11491/3781
2024-03-29T07:22:11Z
2024-03-29T07:22:11Z
Design and analysis of quad-band grid array microstrip antenna at UWB and ISM channel frequencies for WBAN operations
Türkmen, Mustafa
Yalduz, Hüseyin
https://hdl.handle.net/11491/2100
2021-10-31T09:54:12Z
2018-01-01T00:00:00Z
Design and analysis of quad-band grid array microstrip antenna at UWB and ISM channel frequencies for WBAN operations
Türkmen, Mustafa; Yalduz, Hüseyin
In this paper, we present design and simulation of a compact grid array microstrip patch antenna. In the design of antenna a RT/duroid 5880 substrate having relative permittivity, thickness and loss tangent of 2.2, 1.57 mm and 0.0009 respectively, has been used. The simulated antenna performance was obtained by Computer Simulation Technology Microwave Studio (CST MWS). The antenna performance was investigated by analyzing its return loss (S11), radiation pattern, voltage standing wave ratio (VSWR) parameters. The simulated S11 parameter has shown that antenna operates for Industrial, Scientific and Medical (ISM) band and Wireless Body Area Network (WBAN) applications at 2.45 GHZ ISM, 6.25 GHZ, 8.25 GHZ and 10.45 GHZ ultra-wideband (UWB) four resonance frequencies with bandwidth > 500MHz (S11 <; -10dB). The antenna directivity increased towards higher frequencies. The VSWR of resonance frequency bands is also achieved succesfully less than 2. It has been observed that the simulation result values of the antenna are suitable for WBAN applications.
10th International Conference on Electrical and Electronics Engineering, ELECO 2017, 29 November 2017 through 2 December 2017,
2018-01-01T00:00:00Z
Mechanical characterization of ruthenocuprates by nanoindentation technique
Alp, Utkan
Yılmaz, Fikret
Uzun, Orhan
Topal, Uğur
Ergen, Semra
Kölemen, Uğur
https://hdl.handle.net/11491/1635
2021-10-30T20:46:25Z
2014-01-01T00:00:00Z
Mechanical characterization of ruthenocuprates by nanoindentation technique
Alp, Utkan; Yılmaz, Fikret; Uzun, Orhan; Topal, Uğur; Ergen, Semra; Kölemen, Uğur
The nanomechanical properties of RuSr 2 RECu 2O8 (RE = Eu, Gd and Ho) prepared by ammonium nitrate melt technique (ANMT) were investigated using nanoindentation technique. The indentation load–displacement curves of the samples were obtained at different peak loads ranging from 10 to 400 mN. Reduced elastic modulus and hardness of the superconductors calculated from loading–unloading curves were peak load dependent, i.e., indentation size effect (ISE). We observed that Ho substitution led to a substantial improvement in mechanical properties of the RuSr2RECu2O8, which was attributed to the strong grain connectivity and dense and less porous structure of RE = Ho sample. © 2014, Springer Science+Business Media New York.
2014-01-01T00:00:00Z