"uuid","repository link","title","author","contributor","publication year","abstract","subject topic","language","publication type","publisher","isbn","issn","patent","patent status","bibliographic note","access restriction","embargo date","faculty","department","research group","programme","project","coordinates"
"uuid:597a8ae2-9730-435f-842a-d5585deae681","http://resolver.tudelft.nl/uuid:597a8ae2-9730-435f-842a-d5585deae681","5G SIW-Based Phased Antenna Array With Cosecant-Squared Shaped Pattern","Puskely, J. (TU Delft Microwave Sensing, Signals & Systems); Mikulasek, Tomas (Brno University of Technology); Aslan, Y. (TU Delft Microwave Sensing, Signals & Systems); Roederer, A.G. (TU Delft Microwave Sensing, Signals & Systems); Yarovoy, Alexander (TU Delft Microwave Sensing, Signals & Systems)","","2022","In this article, a concept of a phased antenna array based on substrate integrated waveguide (SIW) technology for 5G base stations is proposed. The array has a cosecant radiation pattern in the vertical plane for uniform illumination in a sector area. The array itself consists of 16 SIW traveling wave subarrays of 12 slot-coupled microstrip patch antennas associated with a pair of reflection-canceling vias and phasing elements to get the tapered distribution both in amplitude and phase for the cosecant-shaped radiation pattern. The array is designed to be operational at 28 GHz with a bandwidth of more than 10%, a candidate mm-wave frequency band for 5G. The phased antenna array supports wide-angle scanning of +/-60° in azimuth and exhibits good active impedance properties. The array design is successfully verified experimentally.","5G base station; 5G mobile communication; Antenna arrays; Antenna radiation patterns; Microstrip; Microstrip antenna arrays; Microstrip antennas; Phased arrays; cosecant-squared radiation pattern; microstrip patch antenna; phased antenna array; substrate integrated waveguide","en","journal article","","","","","","Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2022-07-01","","","Microwave Sensing, Signals & Systems","","",""
"uuid:502b2213-3968-42e9-8d49-35e87c6a449d","http://resolver.tudelft.nl/uuid:502b2213-3968-42e9-8d49-35e87c6a449d","Shaped Elevation Patterns for 5G Base Stations","Roederer, A.G. (TU Delft Microwave Sensing, Signals & Systems); Puskely, J. (TU Delft Microwave Sensing, Signals & Systems); Aslan, Y. (TU Delft Microwave Sensing, Signals & Systems); Yarovoy, Alexander (TU Delft Microwave Sensing, Signals & Systems)","","2021","This paper discusses the advantages and an example of using shaped elevation patterns for 5G base stations. A simple iterative power synthesis method involving the phase of shaped patterns, and suitable for both center- and end-fed sub-arrays, is used. Numerical simulations and some experimental results for an array of linear sub-arrays with cosecant squared patterns are presented to validate the concept.","Array antennas; 5G base stations; array antenna synthesis; power synthesis; cosecant squared pattern","en","conference paper","IEEE","","","","","Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2022-08-16","","","Microwave Sensing, Signals & Systems","","",""
"uuid:27d37907-9b02-4790-bb08-3ac3a7b2f8ea","http://resolver.tudelft.nl/uuid:27d37907-9b02-4790-bb08-3ac3a7b2f8ea","Trade-offs Between the Quality of Service, Computational Cost and Cooling Complexity in Interference-Dominated Multi-User SDMA Systems","Aslan, Y. (TU Delft Microwave Sensing, Signals & Systems); Puskely, J. (TU Delft Microwave Sensing, Signals & Systems); Roederer, A.G. (TU Delft Microwave Sensing, Signals & Systems); Yarovoy, Alexander (TU Delft Microwave Sensing, Signals & Systems)","","2020","The future fifth generation (5G) systems will aim to design low-cost phased array base station antenna systems at mm-waves for simultaneous multiple beamforming with enhanced spatial multiplexing, limited interference, acceptable power consumption, suitable processing complexity, and passive cooling. In this study, a multi-user space division multiple access (SDMA) model is developed to investigate the trade-off between the quality of service (QoS), computational complexity in beamforming and cooling requirements for various use cases, and a number of users. The QoS at the user ends is rated by assessing the statistical signal-to-interference-plus-noise ratios (SINRs). Two beamforming algorithms, namely conjugate beamforming (CB) and zero-forcing (ZF), are considered and compared. Depending on the deployment scenario, rotated and optimised array layouts are proposed to be used in CB with the least computational complexity while providing relatively good QoS. Different reduced-complexity ZF algorithms are introduced as a compromise between the SINR performance and computational burden. The impact of the number of simultaneously served users on the thermal management in active integrated 5G base station antenna arrays is investigated as well.","","en","journal article","","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2020-06-01","","","Microwave Sensing, Signals & Systems","","",""
"uuid:d498f402-4f08-4d1e-b8fe-2d612a7628b1","http://resolver.tudelft.nl/uuid:d498f402-4f08-4d1e-b8fe-2d612a7628b1","Performance Comparison of Single- and Multi-Lobe Antenna Arrays in 5G Urban Outdoor Environments at mm-Waves via Intelligent Ray Tracing","Aslan, Y. (TU Delft Microwave Sensing, Signals & Systems); Puskely, J. (TU Delft Microwave Sensing, Signals & Systems); Roederer, A.G. (TU Delft Microwave Sensing, Signals & Systems); Yarovoy, Alexander (TU Delft Microwave Sensing, Signals & Systems)","","2020","The effect of forming single and multi-lobe beam
patterns at mm-wave base station antennas on the received signal
strength and co-channel interference is studied for mm-wave urban outdoor environments. A sample, simplified urban city model is used with randomly selected user positions. Ray tracing simulations are performed to analyze the channel’s directional characteristics towards the test users. Depending on the number of dominant paths, single or multiple main lobes are created in the appropriate directions. Through the simulations, it is observed that in comparison with the multi-lobe beam option, the single-lobe beam provides similar or better received power results (unless the ray phases are equalized at the transmitter or receiver with perfect channel information or there is an unexpected sudden blockage in the main path), while providing better interference cancellation capabilities towards other cochannel users.","beamforming; fifth generation (5G); mm-wave propagation; pattern shaping; phased arrays; ray tracing","en","conference paper","","","","","","Several elements - such as Best Paper Award sessions, Short Courses, and Industrial Workshops - will take place live on-line, while many other elements - such as the technical-scientific papers and presentations - will be accessible on-line. Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2023-10-19","","","Microwave Sensing, Signals & Systems","","",""
"uuid:452546e8-94ff-4e76-bb23-f0c0eecf56de","http://resolver.tudelft.nl/uuid:452546e8-94ff-4e76-bb23-f0c0eecf56de","Effect of Element Number Reduction on Inter-User Interference and Chip Temperatures in Passively-Cooled Integrated Antenna Arrays for 5G","Aslan, Y. (TU Delft Microwave Sensing, Signals & Systems); Puskely, J. (TU Delft Microwave Sensing, Signals & Systems); Roederer, A.G. (TU Delft Microwave Sensing, Signals & Systems); Yarovoy, Alexander (TU Delft Microwave Sensing, Signals & Systems)","","2020","The impact of reducing the total number of elements in passively-cooled, chip-integrated and space-tapered 5G base station antenna arrays on inter-beam interferences and chip temperatures is investigated for multi-user spacedivision-multiple-access applications. A convex element position optimization algorithm is used to synthesize the array layouts with minimized side lobes within a pre-defined cell sector. The multi-beam radiation patterns are computed to study the average trend of the maximum side lobe level with the element number. Thermal simulations are also performed by considering the same EIRP for all the arrays. The results indicate that, after an optimal number of elements, adding more elements to an array does not help reduce the inter-user interference further or provide significant advantage on decreasing the chip temperatures.","antenna synthesis; base station antennas; fifth generation (5G); irregular arrays; passive cooling; sparse arrays","en","conference paper","","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public. Virtual/online event due to COVID-19: Several elements - such as Best Paper Award sessions, Short Courses, and Industrial Workshops - will take place live on-line, while many other elements - such as the technical-scientific papers and presentations - will be accessible on-line.","","2021-12-01","","","Microwave Sensing, Signals & Systems","","",""
"uuid:5cb85188-9671-4b5e-a03d-a1d219c0ae63","http://resolver.tudelft.nl/uuid:5cb85188-9671-4b5e-a03d-a1d219c0ae63","Synthesis of Quasi-Modular Circularly Polarized 5G Base Station Antenna Arrays Based on Irregular Clustering and Sequential Rotation","Aslan, Y. (TU Delft Microwave Sensing, Signals & Systems); Puskely, J. (TU Delft Microwave Sensing, Signals & Systems); Roederer, A.G. (TU Delft Microwave Sensing, Signals & Systems); Yarovoy, Alexander (TU Delft Microwave Sensing, Signals & Systems)","","2020","An unconventional, yet quasi-modular base station phased array architecture synthesis technique is proposed for multiuser fifth-generation applications. By keeping uniform amplitudes and linearly progressing phases at the elements of an optimal irregular array, power-efficient side lobe suppression is achieved for effective inter-user interference mitigation. The layout irregularity is achieved within a slice of an array, which is repeated rotationally. The sequential rotation technique is applied to obtain modularity and improve the circular polarization characteristics. A modified k-means clustering algorithm is used to form the optimal subarrays. The simulation results indicate that the proposed quasi-modular topologies provide a good compromise between the side lobe performance and integrated array design complexity.","antenna optimization; clustered arrays; fifth-generation; irregular architectures; sequential rotation","en","journal article","","","","","","","","","","","Microwave Sensing, Signals & Systems","","",""
"uuid:837a7520-4419-4a27-aa74-6c5197446000","http://resolver.tudelft.nl/uuid:837a7520-4419-4a27-aa74-6c5197446000","Transverse slot with control of amplitude and phase for travelling-wave SIW antenna arrays","Mikulasek, Tomas (Brno University of Technology); Puskely, J. (TU Delft Microwave Sensing, Signals & Systems); Yarovoy, Alexander (TU Delft Microwave Sensing, Signals & Systems); Lacik, Jaroslav (Brno University of Technology); Arthaber, Holger (Technische Universität Wien)","","2020","A novel basic antenna element for travelling-wave substrate integrated waveguide (SIW) arrays is proposed in this study. The antenna element is based on a transverse slot and newly complemented by a pair of vias used for matching and a phase shifter. By changing the geometries of the slot and the phase shifter, the amplitude and phase of a radiated wave can be controlled. The proposed approach extends the potential of transverse slots in SIW-based travelling-wave antenna arrays. To verify the capabilities of the antenna element, the authors demonstrate a six-element array with −30 dB side-lobe suppression, intended for a 24 GHz radar system. The measured results show good agreement with simulations.","","en","journal article","","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2021-04-22","","","Microwave Sensing, Signals & Systems","","",""
"uuid:2781645f-699e-4225-b0e6-98e4ebb83aa9","http://resolver.tudelft.nl/uuid:2781645f-699e-4225-b0e6-98e4ebb83aa9","Heat Transfer Enhancement in Passively Cooled 5G Base Station Antennas Using Thick Ground Planes","Aslan, Y. (TU Delft Microwave Sensing, Signals & Systems); Puskely, J. (TU Delft Microwave Sensing, Signals & Systems); Roederer, A.G. (TU Delft Microwave Sensing, Signals & Systems); Yarovoy, Alexander (TU Delft Microwave Sensing, Signals & Systems)","","2019","The thermal and electromagnetic effects of varying the ground plane thickness and aperture size of the 5G integrated base station antennas are investigated. A double-sided PCB structure is designed with antennas and digital beamforming chips on the opposite sides. Fully-passive cooling is achieved by using fanless CPU coolers attached to the chips. The simulation results indicate that as compared to the standard counterparts, much better cooling performance can be achieved using relatively thick ground planes with extended aperture sizes, with no significant effect on the electromagnetic properties.","active integrated antenna; base station antenna; fifth generation (5G); millimeter-wave communication; passive cooling; thick ground plane","en","conference paper","IEEE","","","","","green","","","","","Microwave Sensing, Signals & Systems","","",""
"uuid:84069d3a-dc4a-4c72-a186-77537780e9da","http://resolver.tudelft.nl/uuid:84069d3a-dc4a-4c72-a186-77537780e9da","5G Multi-User System Simulations in Line-of-Sight With Space-Tapered Cellular Base Station Phased Arrays","Aslan, Y. (TU Delft Microwave Sensing, Signals & Systems); Salman, Salman (Student TU Delft); Puskely, J. (TU Delft Microwave Sensing, Signals & Systems); Roederer, A.G. (TU Delft Microwave Sensing, Signals & Systems); Yarovoy, Alexander (TU Delft Microwave Sensing, Signals & Systems)","","2019","The performance of space-tapered multi-beam arrays with minimized side lobe levels is statistically evaluated in a line-of-sight propagation environment within a cell sector in terms of the signal-to-interference-plus-noise ratio at the multiple user ends. Comparative analyses are performed to examine the advantages of space-tapered, irregular arrays over the conventional regular array layouts. The system model is formulated with a meaningful link-budget analysis. Two different precoding techniques, conjugate beamforming and zero-forcing, are applied to compute the excitation coefficients at the antenna elements. The effects of several practical factors such as approaches in user scheduling, errors in channel state information estimation and quantization in excitation amplitudes and phases are studied. The simulation results indicate that space-tapered arrays with conjugate beamforming statistically perform better than the regular counterparts and can achieve similar performance to zero-forcing precoding when the impact of non-ideal system conditions is considered.","aperiodic array; conjugate beamforming; , fifth generation (5G) base station; multi-user communication; space tapering; zero-forcing","en","conference paper","IEEE","","","","","green","","","","","Microwave Sensing, Signals & Systems","","",""
"uuid:573a80e1-d9f6-4786-ba3c-ebdc125b7796","http://resolver.tudelft.nl/uuid:573a80e1-d9f6-4786-ba3c-ebdc125b7796","Active Multiport Subarrays for 5G Communications","Aslan, Y. (TU Delft Microwave Sensing, Signals & Systems); Puskely, J. (TU Delft Microwave Sensing, Signals & Systems); Roederer, A.G. (TU Delft Microwave Sensing, Signals & Systems); Yarovoy, Alexander (TU Delft Microwave Sensing, Signals & Systems)","","2019","A novel hybrid beamforming architecture based on aphased array of active multiport subarrays is proposed for multi-user 5G applications. The subarrays have multiple simultaneous fixed beams which are smartly combined at the user locations withrelatively large gains towards the intended co-frequency users and sufficiently low inter-user interference levels. The presented architecture has a wider angular coverage than the existing subarray-based hybrid beamforming schemes and reduces the signal processing complexity significantly as compared to the fully digital beamforming.","fifth generation (5G); space division multiplexing; multi-user communication; multi-beam antenna; hybrid beamforming","en","conference paper","","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","","","","Microwave Sensing, Signals & Systems","","",""
"uuid:276f8541-df4e-4d29-8663-12509c6ab6a6","http://resolver.tudelft.nl/uuid:276f8541-df4e-4d29-8663-12509c6ab6a6","System Modeling and Simulation in 5G: A Hybrid Beamforming Approach With Power Flux Equalization in the Elevation Plane","Salman, Salman; Aslan, Y. (TU Delft Microwave Sensing, Signals & Systems); Puskely, J. (TU Delft Microwave Sensing, Signals & Systems); Roederer, A.G. (TU Delft Microwave Sensing, Signals & Systems); Yarovoy, Alexander (TU Delft Microwave Sensing, Signals & Systems)","","2019","This paper presents a 5G downlink system model for a hybrid multi-user beamforming technique at the base station. The presented technique employs power flux equalization in the elevation plane using a fixed analog cosecant-shaped beam and digital beamforming in the azimuth plane. The system performances of various beamforming algorithms are investigated via Monte-Carlo simulations by creating simultaneous co-frequency beams towards the randomly-located users. The simulation results show that the proposed cosecant subarray hybrid beamforming statistically performs better than the state-of-the-art hybrid beamforming techniques and provides reduced complexity.","5G; cosecant radiation pattern; hybrid beamforming; millimeter waves; multiuser communication","en","conference paper","","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","","","","Microwave Sensing, Signals & Systems","","",""
"uuid:83f845f9-3eb8-4d06-b225-9d3c76bf2e7c","http://resolver.tudelft.nl/uuid:83f845f9-3eb8-4d06-b225-9d3c76bf2e7c","Phase-Only Control of Peak Sidelobe Level and Pattern Nulls Using Iterative Phase Perturbations","Aslan, Y. (TU Delft Microwave Sensing, Signals & Systems); Puskely, J. (TU Delft Microwave Sensing, Signals & Systems); Roederer, A.G. (TU Delft Microwave Sensing, Signals & Systems); Yarovoy, Alexander (TU Delft Microwave Sensing, Signals & Systems)","","2019","Minimization of the maximum sidelobe level for a given array geometry, amplitude distribution, and nulling sectors by phase-only adjustment of the element coefficients is studied. Nonlinear optimization problem for phase distribution is solved using a novel iterative convex optimization algorithm, which includes mutual coupling effects and exploits small phase perturbations at each step. Superiority of the algorithm in terms of the peak sidelobe level and nulling depth achieved over several optimization methods reported in the most relevant literature is demonstrated in several case studies. Finally, a case study is performed to demonstrate added value of the algorithm for millimeter-wave fifth generation application with phase-only radiation pattern forming.","Convex optimization; Fifth generation (5G); Interference minimization; Null steering; Phase tapering; Phase-only control; Phased arrays","en","journal article","","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2020-04-30","","","Microwave Sensing, Signals & Systems","","",""
"uuid:8d00f4b1-9ac1-46d4-8b3d-2074bd32d4c4","http://resolver.tudelft.nl/uuid:8d00f4b1-9ac1-46d4-8b3d-2074bd32d4c4","Multiple Beam Synthesis of Passively Cooled 5G Planar Arrays Using Convex Optimization","Aslan, Y. (TU Delft Microwave Sensing, Signals & Systems); Puskely, J. (TU Delft Microwave Sensing, Signals & Systems); Roederer, A.G. (TU Delft Microwave Sensing, Signals & Systems); Yarovoy, Alexander (TU Delft Microwave Sensing, Signals & Systems)","","2019","An extended-feature, system-driven convex algorithm for the synthesis of uniform-amplitude, irregular planar phased arrays with simultaneous multi-beam optimization for mm-wave 5G base station applications in multi-user scenarios is presented. The inter-user interferences are suppressed by minimizing the maximum sidelobe level (SLL) for a beam scanned freely inside a given sector. The aperture size is restricted to the size of the heatsink baseplate dimensions. A minimum guaranteed inter-element spacing in the final layout is pre-defined, which prevents element overlapping, eases the thermal problem and helps reduce the effects of high mutual coupling (MC). The algorithm performance is tested via the synthesis of a 64-element integrated array with at least half a wavelength inter-element spacing. The optimized array results show that, compared to their regular counterparts, significant reduction in the SLLs is achieved for a beam scanned inside the defined sector, while keeping the maximum temperature of the array at a reliable level. The effect of MC on the results is also investigated via full-wave simulations and it is explained how embedded element patterns can potentially be included in the optimization. Superior capabilities of the proposed method are illustrated by comparing the algorithm output to those reported in the state-of-the-art literature.","Antenna synthesis; convex optimization; fifth generation (5G); irregular antenna array; multibeam optimization (MBO); passive cooling; space tapering","en","journal article","","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","2021-12-03","","","Microwave Sensing, Signals & Systems","","",""
"uuid:7d336fd2-d4c4-407c-823d-804852b341eb","http://resolver.tudelft.nl/uuid:7d336fd2-d4c4-407c-823d-804852b341eb","Thermal-Aware Synthesis of 5G Base Station Antenna Arrays: An Overview and a Sparsity-Based Approach","Aslan, Y. (TU Delft Microwave Sensing, Signals & Systems); Puskely, J. (TU Delft Microwave Sensing, Signals & Systems); Janssen, J. H. J. (NXP Semiconductors); Geurts, Marcel (NXP Semiconductors); Roederer, A.G. (TU Delft Microwave Sensing, Signals & Systems); Yarovoy, Alexander (TU Delft Microwave Sensing, Signals & Systems)","","2018","Heat removal capabilities and radiation performances of several sparse antenna array topologies are studied for cooling enhancement in 5G millimeter-wave base station antennas. Both electromagnetic and thermal aspects are jointly considered for the first time in array layout optimization and a novel connection between layout sparsity and thermal management is presented. Two types of active electronically scanned arrays (AESA’s), based on the traditional and planar approaches, are examined. Thermal management in AESA’s is discussed, with a focus on cooling challenges at millimeter waves. Being relatively low-cost and low-profile while supporting flexible beamforming, passively cooled planar AESA’s with fanless CPU coolers are proposed, for the first time, to be used in 5G base stations. Additional cooling for such arrays is achieved by increasing the inter-element distances in the layout. Linear irregular arrays, spiral arrays, thinned arrays, circular ring arrays and heat sink antenna arrays are revisited with a critical discussion on their electromagnetic and thermal performance. The results are compared with regular and square layouts that are used as benchmarks throughout the paper.","Antenna synthesis; base station antennas; fifth generation (5G); millimeter-wave communications; passive cooling; sparse arrays","en","journal article","","","","","","green","","","","","Microwave Sensing, Signals & Systems","","",""
"uuid:f3d86aa0-18b9-4c9c-b1ba-7765f51a5965","http://resolver.tudelft.nl/uuid:f3d86aa0-18b9-4c9c-b1ba-7765f51a5965","Heat source layout optimization for two-dimensional heat conduction using iterative reweighted L1-norm convex minimization","Aslan, Y. (TU Delft Microwave Sensing, Signals & Systems); Puskely, J. (TU Delft Microwave Sensing, Signals & Systems); Yarovoy, Alexander (TU Delft Microwave Sensing, Signals & Systems)","","2018","Optimization of heat source distribution in two dimensional heat conduction for electronic cooling problem is considered. Convex optimization is applied to this problem for the first time by reformulating the objective function and the non-convex constraints. Mathematical analysis is performed to describe the heat source equation and the combinatorial optimization problem. A sparsity based convex optimization technique is used to solve the problem approximately. The performance of the algorithm is tested by several cases with various boundary conditions and the results are compared with a uniformly distributed layout. These results indicate that through proper selection of the number of grid cells for placing the heat sources and a minimum inter-source spacing, the maximum temperature and temperature non-uniformity in the domain can be significantly reduced. To further assess the capabilities of the method, comparisons to the results available in the literature are also performed. Compared to the existing heat source layout optimization methods, the proposed algorithm can be implemented more easily using available convex programming tools and reduces the number of input control parameters and thus computation time and resources while achieving a similar or better cooling performance.","heat source layout; heat conduction optimization; compressed sensing; convex optimization","en","journal article","","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","","","","Microwave Sensing, Signals & Systems","","",""
"uuid:27e0f57f-bbdd-43cf-912f-2efc913b3cf6","http://resolver.tudelft.nl/uuid:27e0f57f-bbdd-43cf-912f-2efc913b3cf6","Synthesis of Multiple Beam Linear Arrays with Uniform Amplitudes","Aslan, Y. (TU Delft Microwave Sensing, Signals & Systems); Puskely, J. (TU Delft Microwave Sensing, Signals & Systems); Roederer, A.G. (TU Delft Microwave Sensing, Signals & Systems); Yarovoy, Alexander (TU Delft Microwave Sensing, Signals & Systems)","","2018","A convex iterative algorithm for the synthesis of uniform amplitude, space-tapered linear phased arrays with simultaneous multiple beam optimization for 5G applications is presented. The performance of the algorithm is demonstrated by the synthesis of two arrays having 16 and 24 elements with 60 and 90 degree scan range, respectively. The effect of phase shifter quantization is also addressed. The results indicate that the space-tapered arrays with multiple beam optimization have improved radiation performance in terms of the side lobe level when compared to both single, broadside, beam optimized space-tapered arrays and uniformly distributed arrays with half wavelength spacing.","linear antenna arrays; phased arrays; antenna synthesis; space taper; density taper; multibeam optimization; convex optimization; 5G communications","en","conference paper","Institution of Engineering and Technology","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","","","","Microwave Sensing, Signals & Systems","","",""
"uuid:3a90bb99-28c6-43f8-8100-b5a5c0e7893a","http://resolver.tudelft.nl/uuid:3a90bb99-28c6-43f8-8100-b5a5c0e7893a","SIW Based Antenna Array with Power Equalization in Elevation Plane for 5G Base Stations","Puskely, J. (TU Delft Microwave Sensing, Signals & Systems); Aslan, Y. (TU Delft Microwave Sensing, Signals & Systems); Roederer, A.G. (TU Delft Microwave Sensing, Signals & Systems); Yarovoy, Alexander (TU Delft Microwave Sensing, Signals & Systems)","","2018","In this paper, we present a 5G base station phased antenna array concept based on the power equalization in the elevation cut. We designed aperture coupling microstrip patch array exploiting a substrate integrated waveguide structure as feeding line for realization of the cosecant radiation pattern in elevation cut. The antenna is designed to be operational at frequency about 28.5GHz targeting a candidate 5G mm-wave frequency band. The dimensions of the cosecant antenna array support wide-angle scanning in horizontal plane in the final phased antenna arrays. The antenna exhibits good impedance and radiation properties in the scanning range +/- 45deg.","5G base station; phased array antenna; microstrip patch antenna; substrate integrated waveguide; cosecant radiation pattern","en","conference paper","Institution of Engineering and Technology","","","","","Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.","","","","","Microwave Sensing, Signals & Systems","","",""
"uuid:dea8db6e-f1f9-4e4f-b378-db541b0d0f9e","http://resolver.tudelft.nl/uuid:dea8db6e-f1f9-4e4f-b378-db541b0d0f9e","Two-Port Dual-Band Microstrip Square-Ring Antenna for Radar Applications","Puskely, J. (TU Delft Microwave Sensing, Signals & Systems); Yarovoy, Alexander (TU Delft Microwave Sensing, Signals & Systems); Roederer, A.G. (TU Delft Microwave Sensing, Signals & Systems)","Mattes, Michael (editor)","2016","A novel two-port, dual-band square-ring microstrip antenna element for wide-angle scanning planar phased array is proposed. The two ports are used to operate the antenna array over the L and S radar bands. Microstrip square-ring radiators are chosen due to their smaller dimensions compared to the conventional microstrip patch. To extend operational bandwidth, the square rings placed into a single layer are fed by small coupling patches. The antenna elements demonstrate consistent radiation patterns and sufficient bandwidths in both operational bands. Due to its dimensions, the element is well-suited for application to wide-scan phased arrays.","radar; square-ring; dual-band; two-port; phased arrays; L-band; S-band","en","conference paper","IEEE","","","","","Accepted Author Manuscript","","","","","Microwave Sensing, Signals & Systems","","",""