Browsing Engineering by Author "Koziel, Slawomir"
Now showing items 1-9 of 9
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Correlation Reduction in Closely-Spaced MIMO Antenna with Circular Polarization Diversity
Ullah, Ubaid; Al-Hasan, Muath; Ben Mabrouk, Ismail; Koziel, Slawomir; Abbasi, Qammer; Alomainy, Akram (Institute of Electrical and Electronics Engineers Inc., 2020)Radiator correlation in multiple-input-multiple-output (MIMO) antenna has always been a serious concern for MIMO systems. In this paper, an antenna consisting of two parallel-placed coplanar waveguide (CPW)-fed radiators ... -
Cost-Efficient Bi-Layer Modeling of Antenna Input Characteristics Using Gradient Kriging Surrogates
Pietrenko-Dabrowska, Anna; Koziel, Slawomir; Al-Hasan, Muath (Institute of Electrical and Electronics Engineers Inc., 2020)Over the recent years, surrogate modeling has been playing an increasing role in the design of antenna structures. The main incentive is to mitigate the issues related to high cost of electromagnetic (EM)-based procedures. ... -
Design-Oriented Two-Stage Surrogate Modeling of Miniaturized Microstrip Circuits with Dimensionality Reduction
Koziel, Slawomir; Pietrenko-Dabrowska, Anna; Al-Hasan, Muath (Institute of Electrical and Electronics Engineers Inc., 2020)Contemporary microwave design heavily relies on full-wave electromagnetic (EM) simulation tools. This is especially the case for miniaturized devices where EM cross-coupling effects cannot be adequately accounted for using ... -
Expedited re-design of multi-band passive microwave circuits using orthogonal scaling directions and gradient-based tuning
Koziel, Slawomir; Pietrenko-Dabrowska, Anna; Ullah, Ubaid (Nature Research, 2024-12)Geometry scaling of microwave circuits is an essential but challenging task. In particular, the employment of a given passive structure in a different application area often requires re-adjustment of the operating ... -
Highly integrable planar-structured printed circularly polarized antenna for emerging wideband internet of things applications in the millimeter-wave band
Ullah, Ubaid; Koziel, Slawomir; Pietrenko-Dabrowska, Anna (Nature Research, 2024)This paper proposes a numerically and experimentally validated printed wideband antenna with a planar geometry for Internet of Things (IoT) applications. This design tackles the challenges associated with deploying IoT ... -
Improved-efficacy optimization of compact microwave passives by means of frequency-related regularization
Koziel, Slawomir; Pietrenko-Dabrowska, Anna; Al-Hasan, Muath (Institute of Electrical and Electronics Engineers Inc., 2020)Electromagnetic (EM)-driven optimization is an important part of microwave design, especially for miniaturized components where the cross-coupling effects in tightly arranged layouts make traditional (e.g., equivalent ... -
Mutual Coupling Reduction in Antenna Arrays Using Artificial Intelligence Approach and Inverse Neural Network Surrogates
Roshani, Saeed; Koziel, Slawomir; Yahya, Salah I.; Chaudhary, Muhammad Akmal; Ghadi, Yazeed Yasin; Roshani, Sobhan; Golunski, Lukasz (Multidisciplinary Digital Publishing Institute (MDPI), 2023)This paper presents a novel approach to reducing undesirable coupling in antenna arrays using custom-designed resonators and inverse surrogate modeling. To illustrate the concept, two standard patch antenna cells with 0.07λ ... -
Reduced-cost microwave modeling using constrained domains and dimensionality reduction
Koziel, Slawomir; Pietrenko-Dabrowska, Anna; Ullah, Ubaid (Nature Research, 2023-12)Development of modern microwave devices largely exploits full-wave electromagnetic (EM) simulations. Yet, simulation-driven design may be problematic due to the incurred CPU expenses. Addressing the high-cost issues ... -
Reduced-cost two-level surrogate antenna modeling using domain confinement and response features
Pietrenko‑Dabrowska, Anna; Koziel, Slawomir; Ullah, Ubaid (Nature Research, 2022)Electromagnetic (EM) simulation tools have become indispensable in the design of contemporary antennas. Still, the major setback of EM-driven design is the associated computational overhead. This is because a single full-wave ...