A5083733518- Millimeter-Wave Propagation and Modeling
- Microwave Engineering and Waveguides
- Advanced Photonic Communication Systems
- Advanced Wireless Communication Technologies
- Electromagnetic Compatibility and Noise Suppression
- Interactive and Immersive Displays
- Antenna Design and Analysis
- Photonic and Optical Devices
- Photorefractive and Nonlinear Optics
- Advanced Antenna and Metasurface Technologies
- Advanced MIMO Systems Optimization
- Advanced Fiber Laser Technologies
- 3D IC and TSV technologies
- Innovative Human-Technology Interaction
- Power Line Communications and Noise
- Green IT and Sustainability
- RFID technology advancements
- Advancements in PLL and VCO Technologies
- Optical Wireless Communication Technologies
- Radio Frequency Integrated Circuit Design
- Full-Duplex Wireless Communications
- Cooperative Communication and Network Coding
- Integrated Circuits and Semiconductor Failure Analysis
- Antenna Design and Optimization
Ghent University
2021-2024
Imec the Netherlands
2021-2023
IMEC
2022
Integrated photonic systems require fast modulators to keep up with demanding operation speeds and increasing data rates. The silicon nitride integrated platform is of particular interest for applications such as datacom, light detection ranging (LIDAR), quantum photonics, computing owing its low losses CMOS compatibility. Yet, this inherently lacks high-speed modulators. Heterogeneous integration lithium niobate on waveguides can address drawback strong Pockels effect. We demonstrate the...
Beyond-5G wireless systems require significant improvement to enable the Internet of Everything, offering ultra-reliability, ultra-low-latency and high data-rates for holographic telepresence, immersive augmented virtual reality, cyber-physical in Industry 4.0. The mmWave frequency band (30–300 GHz) provides required bandwidths, but very challenging propagation conditions exist. Conventional co-located multi-antenna counter higher path loss, are insufficient real-life scenarios with frequent...
This article presents a novel <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$4\times 4$ </tex-math></inline-formula> Butler matrix implemented in the grounded co-planar waveguide (GCPW) technology, compactly integrated with highly efficient and broadband notation="LaTeX">$1\times air-filled substrate (AFSIW) cavity-backed patch antenna array (AA), giving rise to broad operational frequency range [23.75,...
A high-speed modulator on silicon nitride is demonstrated using 2 mm-long micro-transfer printed lithium niobate coupons. This device has a 3-dB bandwidth >50GHz, and an insertion loss of 3.3 dB that allowed us to transmit 70 Gb/s.
A low-complexity and efficient mmWave-over-fiber remote antenna unit (RAU) is proposed that enables broadband transmission wide-angle squint-free beam steering in the full [26.5-29.5]GHz n257 5G band.It leverages an in-house developed optical beamforming network (OBFN), implemented on a silicon photonics integrated circuit, optically enabled 1x4 uniform linear array (ULA), enabling grating-lobe-free between [-50 • , 50 ].The elements (AEs) of ULA are air-filled substrate-integratedwaveguide...
Recent technological advancements in the field of antenna design and microwave photonics have paved way for broadband efficient mmWave-over-fiber distributed systems. In this work, we discuss practical realization measurement setup a link tackle unfavorable propagation conditions that arise at mmWave frequencies. First, demonstrate 24 Gbps fiber-wireless through use highly robust air-filled substrate-integrated-waveguide antennas custom co-designed photoreceiver with low-noise amplifier....
Although challenging propagation conditions reduce its reliability, the mmWave spectrum is considered a cornerstone of (beyond-)5G networks. Recently, distributed antenna systems (DASs) surrounding mobile users with multiple remote units (RAUs) interconnected by mmWave-over-fiber technology were identified as prime candidate to unlock high throughput and reliable coverage. This article proposes dedicated simulation suite facilitating deployment such mmWave-over-fiber-based DAS accurately...
In this paper, we propose passive millimeterwave (mmWave) components for Butler matrix beamforming networks implemented in grounded-coplanar waveguide (GCPW) technology designed integration and co-optimization with an antenna array operating the 28 GHz 5G band. Within frequency band of interest, covering [26.5 GHz–29.5 GHz] spectrum, insertion loss hybrid coupler crossover stays well below 0.75 dB, while amplitude imbalance remains 0.5 dB phase does not exceed 5°.
In high-speed differential interconnects on printed circuit boards, signal integrity (SI) issues arise when neglecting the inherent low-pass characteristic and ubiquitous presence of common-mode noise. This work proposes a novel open-circuited stub equalizer with integrated filter in order to compensate for while simultaneously suppressing transmission unwanted noise receiver. A theoretical analysis is conducted, suitable approximations are derived facilitate synthesis. Experimental...
This contribution discusses several recently proposed remote antenna units (RAUs) based on air-filled substrate-integrated-waveguide technology, specifically focusing the co-design between elements and optoelectronic transducers. These include two passive sub-6 GHz transmit RAUs one active mmWave RAU. It is concluded that RAU's performance benefits from a thorough co-design, aiming for conjugate-match both components, when compared to diakoptic design procedure, optimizing components...
We propose a packaging technique for the intricate routing networks in millimeterwave (mmWave) applications based on substrate integrated coaxial lines (SICLs), to eliminate spurious feed network radiation that may influence antenna array's pattern. Next thorough comparison with grounded co-planar waveguides (GCPWs), via transition and novel packaged hybrid coupler are designed, fabricated measured 28 GHz 5G bands. The proposed shielded from SICL exhibits insertion loss smaller than 0.7 dB...
A mmWave-over-fiber distributed antenna system (DAS), in combination with highly efficient air-filled substrate-integrated-waveguide (AFSIW) remote units (RAUs), proves to be a prime candidate counter the harsh propagation conditions that arise at mmWave frequencies. This paper proposes system-level model accurately analyze link quality of downlink wireless time-efficient way. The includes realistic description, fiber losses, and non-linear effects opto-electrical/electro-optical transducers...
To support the most demanding new applications, beyond5G systems will more than ever rely on multi-antenna deployments and mm-wave spectrum. Unfortunately, due to its propagation properties, ultra-reliable high-data-rate coverage seems elusive. Distributed antenna based mm-wave-over-fiber constitute a strong candidate technology unlock reliable coverage, although concept critically depends for large part availability of cost-effective power-efficient remote units (RAUs). This contribution...
In this contribution, we investigate the implementation of air-filled substrate-integrated-waveguide (AFSIW) components based on assembly multiple standard manufactured single printed circuit boards (PCBs) as a cost-effective, low loss routing alternative for millimeterwave antenna arrays. To end, transition from grounded co-planar waveguide (GCPW) to AFSIW is designed, fabricated and measured integration purposes with active electronics in n257 5G band. The minimal insertion equals 0.7 dB...
An electromagnetic interference (EMI) assessment of mmWave interposers becomes increasingly important as the need for heterogeneous systems increases. However, small size and complexity these platforms make it more difficult to accurately measure them and, thus, a dedicated set-up isolate interposer's emission is required. In this contribution, we first show experimentally that at frequencies surface waves originating on interposer test vehicles may interact with larger measurement board...