Volume 5, 2026

DOI 25017

EuCAP 2025 SPECIAL ISSUE

Pin-Fin Heatsink Active Antenna Array With Joint Bandwidth Improvement, Footprint Miniaturization and Cooling Benefits
Authors:  Feza Turgay Celik, Alexander Yarovoy, Yanki Aslan

Abstract:  This paper presents a novel heatsink antenna array architecture that addresses electromagnetic (EM) performance, antenna miniaturization, and thermal management challenges in antenna-on-substrate (AoS) configurations. By integrating tilted fin heatsinks onto rectangular patch antennas, the proposed unit element improves convective cooling while maintaining desirable radiation characteristics. A parametric analysis demonstrates that optimizing the fin tilt angle results in an 8 % reduction in the resonant frequency, effectively miniaturizing the antenna. To further enhance array performance, complementary split ring resonator (CSRR) walls are introduced between elements. These structures significantly reduce mutual coupling from approximately −9 dB to −15 dB and more than double the impedance bandwidth, increasing it from 3.3 % to 7.5 %. The results confirm improved radiation performance with a 12.7 % operational radiation pattern bandwidth centered at 24 GHz and stable gain across scan angles. On the thermal side, distributed chip placement and enhanced convective paths reduce chip temperatures from 97.3 °C to 70.3 °C for 1 W heat power per chip, and from 171.7 °C to 138.9 °C for 2 W heat power per chip under forced airflow conditions compared to the standard patch array. The proposed dual-functional design provides an efficient and compact solution for future high-power and thermally constrained antenna systems, with promising applications in 5G, radar, and mm-wave communication.
Measurement-Validated RF-DT Modeling of Dynamic ISAC Channels in UMi Scenarios

EuCAP 2026 SPECIAL ISSUE

Measurement-Validated RF-DT Modeling of Dynamic ISAC Channels in UMi Scenarios
Authors:  César Montaner, Saúl Fenollosa, Hugo Beltrán, Marco Ibáñez, Narcis Cardona

Abstract:  This paper presents a measurement-validated Radio-Frequency Digital Twin (RF-DT) framework for dynamic Integrated Sensing and Communication (ISAC) channel modeling in urban microcell environments at E-band. The proposed methodology combines wideband channel sounding, high-resolution ray tracing, realistic antenna patterns, and material-dependent directive/diffuse scattering to reproduce dynamic propagation conditions in both mono-static and bi-static sensing configurations. The validation comprises six dynamic configurations, involving static transceivers with moving targets and moving user equipment platforms. Measurements and simulations are assessed through power–delay profile (PDP) evolution, snapshot-wise root-mean-square error and correlation, delay–Doppler analysis, temporal-consistency indicators, and a PDP-derived Shannon-equivalent relative link-quality metric. Results show that the RT-based RF-DT reproduces the dominant multipath components and their temporal evolution without channel normalization, achieving low PDP errors and high correlation with measurements across the considered configurations. In addition, the delay–Doppler validation confirms that the simulator captures the phase evolution associated with target motion, while the temporal-consistency and capacity analyses demonstrate a close agreement in channel dynamics and effective link-quality trends. These results highlight the importance of accurate geometry, material characterization, and diffuse-scattering modeling for realistic high-frequency ISAC simulations. The proposed framework provides a scalable tool for the development, validation, and benchmarking of future 6G ISAC systems in dynamic environments.