A5042533970- Antenna Design and Analysis
- Advanced Photonic Communication Systems
- Antenna Design and Optimization
- Advanced Antenna and Metasurface Technologies
- Microwave Engineering and Waveguides
- Optical Network Technologies
- Advanced Optical Network Technologies
- Advanced MIMO Systems Optimization
- Millimeter-Wave Propagation and Modeling
- Photonic and Optical Devices
- Electromagnetic Scattering and Analysis
- Energy Harvesting in Wireless Networks
- Structural Analysis and Optimization
- Software-Defined Networks and 5G
- Electromagnetic Compatibility and Measurements
- Cooperative Communication and Network Coding
- Optical Wireless Communication Technologies
- Power Line Communications and Noise
- Advanced Fiber Laser Technologies
- Satellite Communication Systems
- Calibration and Measurement Techniques
- Neural Networks and Reservoir Computing
- Advanced Optical Sensing Technologies
- Planetary Science and Exploration
- Wireless Networks and Protocols
Aristotle University of Thessaloniki
2021-2024
Institute of Electrical and Electronics Engineers
2023
Eindhoven University of Technology
2016-2022
National Research Tomsk State University
2020
Tomsk Polytechnic University
2020
Democritus University of Thrace
2014-2018
The current work presents the first experimental demonstration of real-time Ethernet (ETH) trial services and 4K-Ultra High Definition (UHD) video application transmission over a 2λ Wavelength Division Multiplexing (WDM) analog Fiber-Wireless (FiWi) mmWave X-haul network, supporting dynamic flexible capacity allocation through an integrated silicon photonic Si <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> N...
This work aims at the establishment of a methodology providing characteristic modes mobile devices realistic models including their metallic parts as well material-dielectric loading. A modified integral equation Moment method is employed to yield impedance matrix such metal-dielectric structures. In turn mode approach formulate and solve related eigenproblem.
The growing demand for ubiquitous broadband connectivity in 5G/6G Radio Access Networks (RANs) has turned Centralized RAN (C-RAN) and reconfigurable Point-to-MultiPoint (PtMP) network topologies into the mainstream approach keeping pace with vastly increasing traffic capacities connection densities. Relying on an all-passive Arrayed Waveguide Grating Router (AWGR), we propose demonstrate allocation of multiple parallel Fiber-Wireless (FiWi) millimeter wave (mmWave) analog (Intermediate...
A novel technique is presented for the design and optimization of waveguide antenna arrays based on overlapping subarrays limited field-of-view (FoV) applications. Each subarray consists one directly fed element several passive reactive-loaded elements. The proposed scheme exploits a free-space reactive coupling instead more conventional schemes complex beamforming networks. This results in drastic reduction number components required feeding network. considered class array structures using...
Towards enabling bandwidth-hungry 5G applications, a Fiber-Wireless (FiWi) mobile fronthaul architecture is experimentally presented supporting the co-existence of spectrally efficient analog transport formats with Digital Radio over Fiber schemes, combined millimeter wave (mmWave) high-capacity wireless channels. Flexible network reconfiguration proposed by means low-loss 1 × 4 Si <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> N...
This work presents a seamless integration of wireless D-band transmission link to fiber network. The is performed by utilizing recently developed direct up-/down- conversion and high gain flat EBG antennas, thus resolving the issue complexity cost optical heterodyne mixing adopted until now for generation signals in fiber-wireless implementations. More specifically baseband signal up 12.5GB/s as well QAM modulated IF 256QAM 900Mbaud demonstrated successfully validating potential become next...
The Characteristic Mode analysis of a drop-like supershaped patch antenna constitutes the main scope this project. Supershapes are abstract shapes generated by J. Gielis' Superformula and used as radiators with wideband properties. eigenanalysis is performed on PMCHWT formulated MoM-matrix, derived from combined field integral equation. characteristic modes analyzed via equivalent magnetic currents printed aperture surface cavity-like subdomain simulated structure.
At the dawning of beyond 5G era, broadband last mile connectivity is stimulating rapid developments in optical and wireless technologies that will efficiently handle traffic generated by mobile users demanding network applications. To this end, multiple Radio Access (multi-RAT) operating at various millimeter wave (mmWave) frequency bands, e.g., V-/E-/D-band are being actively pursued, parallel with investigation efficient fiber fronthaul schemes, e.g. Analog over Fiber (aRoF) or...
This paper presents the design and analysis of an on-rocket antenna used in a radio-interferometry experiment. The goal experiment is to accurately track sounding rocket during flight. operates 70 cm band designed work under tight constraints; confined space, stable center frequency large temperature variations low budget. A microstrip patch on PEEK450G903 substrate was identified as most suitable solution, due relatively cost dielectric properties PEEK material. achieved bandwidth 2.5 MHz....
The goal of this paper is to show that a reactively loaded antenna able provide maximum directivity similar the one featured by uniformly excited array featuring same physical aperture. In particular, it shown superdirectivity behavior such an can be achieved without compromising relevant radiation efficiency.
This paper presents a novel antenna array structure featuring flat-top symmetric two-dimensional radiation pattern. The radiating consists of an active surrounded by reactively loading elements. pattern is achieved properly tuning the reactive loads, which are realized as metal waveguides filled with homogeneous dielectric material and terminated on short circuit. reactance parasitic elements modulated controlling length waveguides. An 11×11 has been designed analyzed. optimized exhibits...
The aim of this paper is to introduce a novel super-elliptical waveguide technology for the design reactively loaded antenna arrays. benefits arising from application proposed geometry based on Lame' equation are described and discussed in detail, with special focus possibility controlling parasitic coupling level between adjacent waveguiding structures by changing relevant cross section. This gives us an additional degree freedom process
In order to meet the ever-increasing 5G and beyond Radio Access Network (RAN) densification demands, Fiber-Wireless transport networks are expected play a key role in accelerating deployment by providing essential RAN flexibility, while at same time avoiding costly fiber-trenching. Due inefficiency of Radio-and-Fiber (R&F) for application dense topologies, Analog-Radio-over-Fiber (A-RoF) technology is regarded as enabling solution, since it greatly simplifies remote antenna offering very...
In this paper, we study the joint problem of real-time user association, traffic routing and Virtual Network Function (VNF) placement towards maximizing mobile network's energy efficiency acceptance ratio. The studied is formulated as a Mixed Integer Linear Program (MILP), under various computational, capacity, flow conservation constraints, while also meeting Service Chain (SFC), throughput delay requirements each service request. addition to optimal solution MILP problem, an efficient low...
This paper introduces an innovative photonic MIMO processing architecture through the adaptation of a crossbar linear operator. The merits this approach, such as restorable fidelity and reduced programming complexity, are highlighted. Experimental validation is conducted using 4×4 crossbar-integrated chip, resulting in reporting 8.4 dB power tunability complete pi-phase shift for every node, validating way tunable weight matrix implementation. Furthermore, outlines potential directions...
A flexibly reconfigurable optical circuit switched edge network architecture relying on wavelength-tunable SFP+ transceivers is presented for the first time reconfigurable, low-latency 5G/6G networks. The proposed solution employs traditional cost-effective, fixed wavelength 10G as grey optics towards access side of and programmable tunable at part Central Office premises, while allowing flexible reconfiguration all-passively via an additional AWG demultiplexer. allows to reconfigurably...
The design of reactively-loaded antenna arrays featuring a pulse-shaped radiation pattern for limited scan-angle applications is presented. use the reactive loading allows reducing complexity feeding structure, eliminating need complex overlapping beam-forming networks and permitting drastic reduction in number control points.
This paper presents the end-to-end integration of a software defined network (SDN) reconfigurable real-time analog-intermediate frequency-over-fiber (A-IFoF)/millimeter wave (mmWave) layout into real mobile operator (MNO) infrastructure. The key part presented infrastructure is fully programmable gateway array (FPGA)-based A-IFoF transceiver (TxRx), equipped with active SDN functionalities based on constant monitoring transport link. was successfully evaluated in physical data management and...
We present an optimized Medium-Transparent MAC (oMT-MAC) protocol for Analog-RoF Fiber-Wireless 5G and beyond X-haul networks, capable of generating optimum transmission schedule, which boosts the protocol's efficiency by utilizing full delay budget higher priority flows. Results show that oMT-MAC's optimization model can reduce delays up to 20% low-priority flows while maintaining Fronthaul URLLC KPIs.
This paper proposes a novel high-gain antenna element that can be used in arrays only require limited scan range. Each uses linear sub-array of highly-coupled open-ended waveguides. The active central this is directly fed, while the remaining passive waveguides are reactively loaded. loads implemented by short-circuits positioned at various distances from radiating aperture. short-circuit positions control radiation pattern properties and scattering parameters array. proposed optimized...
A procedure for calculating the characteristic modes series and parallel resonances calculation based on finite element method (FEM), in contrast to established use of Method Moment (MoM) is developed. mode formulation electric currents yields only analyzed structure. The direct becomes feasible with usage equivalent magnetic current modes. For this purpose we have recently employed. This able handle open-radiating structures even loaded anisotropic media, it utilizes absorbing boundary...
Three D-band Fiber-Wireless Multi-IFoF links each with 0.5 Gb/s per beam are experimentally transmitted across a 7km fiber and V-band MIMO antenna 90°-degree RF-beamsteering, forming the first demonstration of THz X-haul multi-beam mmWave antenna.