Seyit Sencer Koç

E-mail

skoc@metu.edu.tr

Department

Department of Electrical and Electronics Engineering

ORCID

0000-0002-1978-4613

Scopus Author ID

7003829699

Effect of Soliton Decomposition on Harmonic Levels in a Lumped NLTL Multiplier Erdem, Fatih; Koç, Seyit Sencer (2024-01-01) A sinusoidal wave entering nonlinear transmission line (NLTL) multipliers undergoes an edge-sharpening effect. As a result, a sharpened waveform with rich harmonic content is obtained. However, the levels of generated harm...
X-Band Near-Field GPR Based on Collimated and Focused Vortex Waves Using Ellipsoidal Reflector Cetiner, Ramazan; Hizal, Altunkan; Koç, Seyit Sencer; Yildiz, Hayrullah (2024-01-01) Electromagnetic vortex waves (VW) with orbital angular momentum (OAM), generated by a uniform circular array (UCA), are collimated and focused in the ground by an elliptical reflector in the near field (NF). This antenna s...
Analytical Computation of Mutual Impedance between Two Closely Spaced Antennas Öztürk, Mehmet Ali; Koç, Seyit Sencer (2024-01-01) Mutual impedance between two closely spaced an-tennas is analytically computed using spherical harmonics and reaction theorem. When two antennas are closely spaced, a reaction surface that lies completely in the convergenc...
A non-conventional planar phased array based on the field equivalence principle for wide angle steering of Gaussian beams Cetiner, Ramazan; Yildiz, Hayrullah; Hizal, Altunkan; Koç, Seyit Sencer (2023-01-01) A non-conventional planar phased array (PA) for generation and steering of Gaussian electromagnetic (EM) beams (GB) is investigated in detail. It includes a new approach. The near field of an ideal virtual antenna (VA), wh...
A Compound ECCM Technique for FMCW Radars Eser, Dogancan; Demir, Şimşek; Koç, Seyit Sencer (2023-01-01) This paper presents a compound electronic counter-countermeasure (ECCM) technique for frequency-modulated continuous-wave (FMCW) radars to counter electronic countermeasure (ECM) techniques such as coherent spoofing, non-c...
Finite-Aperture Microwave Bessel Beams with Vortex Twisting, Fracturing, and Dynamic Phase-Shift Control Yurchenko, Vladimir; ÇİYDEM, MEHMET; Koç, Seyit Sencer (2022-01-01) —Finite-aperture microwave vortex beams of various structures in the near-, middle-, and far-field propagation zones have been simulated. The decay of external sidelobes leading to the end of non-diffractive propagation wi...
Multilayer grid polarizers: Simulations for millimeter waves Yurchenko, Vladimir; ÇİYDEM, MEHMET; Gradziel, Marcin; Koç, Seyit Sencer (2021-1-01) All rights reserved.Multilayer grid polarizers for millimeter waves produced with photolithographic technology have been simulated. Polarizers have spectral bands of enhanced performance where polarization extinction ratio...
Sparse Reconstruction for Near-Field MIMO Radar Imaging Using Fast Multipole Method Miran, Emre A.; Öktem, Sevinç Figen; Koç, Seyit Sencer (2021-01-01) Radar imaging using multiple input multiple output systems are becoming popular recently. These applications typically contain a sparse scene and the imaging system is challenged by the requirement of high quality real-tim...
The Fast Multipole Method for Sparse Solution of Linear Inverse Scattering Problems Miran, Emre Alp; Koç, Seyit Sencer (2018-11-02) The sparse solution for the linear inverse problems provide useful results for many fundamental engineering applications such as radar imaging. The studies in the literature has shown that the computational methods for the...
VHF suspended plate transmitter antenna design for DVB-T and DAB-T Ali, Abdul; Ciydem, Mehmet; ALTINTAŞ, AYHAN; Koç, Seyit Sencer (2018-06-01) This paper presents the design of stacked suspended plate transmitter antenna for digital video and audio broadcasting. Contrary to conventional dipole structures, we have designed the antenna in VHF band (174-254MHz) with...

Citation Formats