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Gönül Sayan

Department of Electrical and Electronics Engineering
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Response to "Comment on 'Sliding planar conjoined cut-wire-pairs: A novel approach for splitting and controlling the absorption spectra'" [J. Appl. Phys. 128, 126101 (2020)]
Karacan, Nezihe; EKMEKÇİ, Evren; Sayan, Gönül (AIP Publishing, 2020-09-01)
In the Comment by S. C. Bakshi and D. Mitra [J. Appl. Phys. 128, 126101 (2020)], it is claimed that "cross-polarization reflection was ignored in calculation of absorptivity of that structure," "the actual absorptivity of ...
Bismuth plasmonics for extraordinary light absorption in deep sub-wavelength geometries
Ozbay, Imre; Ghobadi, Amir; BÜTÜN, BAYRAM; Sayan, Gönül (The Optical Society, 2020-02-01)
In this Letter, we demonstrate an ultra-broadband metamaterial absorber of unrivaled bandwidth (BW) using extraordinary optical response of bismuth (Bi), which is the material selected through our novel analysis. Based on ...
Metasurface Lens for Ultra-Wideband Planar Antenna
Yesilyurt, Omer; Sayan, Gönül (Institute of Electrical and Electronics Engineers (IEEE), 2020-02-01)
In this article, an ultra-wideband metasurface lens is designed and integrated into an antipodal Vivaldi antenna (AVA) to improve its radiation directivity without affecting its efficiency and return loss characteristics. ...
Directivity enhancehment of antipodal vivaldi antenna using broadband metasurface lens
Sayan, Gönül; Yesilyurt, Omer (2019-07-01)
© 2019 IEEE.In this work, radiation performance of an antipodal Vivaldi antenna is enhanced using a broadband metasurface lens structure in 1-6 GHz bandwidth. Radiation pattern for the new antenna is more directive due to ...
Detection and Microwave Imaging of Conducting Objects Buried Very Closely to the Air-Soil Boundary
Dinc, Selman; Elibol, Hande; Guneri, Rutkay; Ozdol, Ali Bahadir; Sik, Furkan; Yesilyurt, Ismail Taylan; DOĞAN, MESUT; Sayan, Gönül (2019-01-01)
Down-looking Ground Penetrating Radar (GPR) is an ultra-wideband electromagnetic sensor which has important applications such as IED and landmine detection, locating people in earthquake rescue operations, detection of arc...
Inside-the-wall detection of objects with low metal content using the GPR sensor: effects of different wall structures on the detection performance
DOĞAN, MESUT; YESİLTURT, Omer; Sayan, Gönül (2018-04-19)
Ground penetrating radar (GPR) is an ultra-wideband electromagnetic sensor used not only for subsurface sensing but also for the detection of objects which may be hidden behind a wall or inserted within the wall. Such appl...
Investigation of the Effects of Buried Object Orientation in Subsurface Target Detection by GPR
Doğan, Mesut; Sayan, Gönül (2017-10-27)
Use of ultra-widehand ground penetrating radars (GPRs) have been the most effective approach in subsurface target detection. Proper preprocessing, prescreening, feature extraction, classification and fusion techniques are ...
Wide Bandwidth Absorption in the MWIR Region using a Thin and Simple Metamaterial Absorber
ÜSTÜN, KADİR; Sayan, Gönül (2017-09-27)
In this study, metamaterial absorber structures that operate in the mid-wave infrared (MWIR) region are presented. The advantage of the design stems from the high absorptance in the region of interest and the ease of fabri...
Through-The-Wall Target Detection using GPR A-Scan Data: Effects of Different Wall Structures on Detection Performance
DOĞAN, MESUT; Sayan, Gönül (2017-09-27)
Ground penetrating radar (GPR) is an electromagnetic sensor based on the ultra-wideband radar technology that can also be used for through-the-wall (TTW) target recognition. Search for the presence of designated targets hi...
Detection of Conducting and Dielectric Objects Buried under a Layer of Asphalt or Concrete Using Simulated Ground Penetrating Radar Signals
DOĞAN, MESUT; GÜMÜŞ, SİNEM; Sayan, Gönül (2017-09-15)
Ground-penetrating radars (GPRs) are ultra-wideband microwave sensors mainly used for detection and identification of mines and other explosive objects buried in soil or hidden under road construction layers. In this stud...