Niels Vesterdal

Senior Research Engineer

Education: Industrial PhD, MSc in Electrical Engineering Specialization: Reflector antenna design, computational electromagnetics With TICRA since: 2012

Phone: +45 3312 4572

Niels is part of the Computational Electromagnetics team where he works with EM modelling and its implementation in TICRA’s software products.

Large Reflectarray for SAR for Earth Observation: RF Design and Measurement Correlation

In this paper the RF design of a large Ka-band reflectarray for Synthetic Antenna Radar (SAR) application and the correlation with the measured data are introduced. The reflectarray is part of a dual-offset antenna system for a high-resolution and wide-swath…

Advanced Antenna Modelling Tool for Performance Verification and Diagnosis

A development project of a new software tool for uncertainty quantification (UQ) of an antenna’s performance caused by the stochastic behaviour of design variables of the system has been performed within the ESA Contract No. AO/1-10116/19/NL/AS. The mathematical algorithms implemented…

RF Modeling and Measurements of a Reflectarray for Synthetic Aperture Radar for Earth Observations

Design and simulation results of a polarisation-selective reflectarray in Ka band are presented. The reflectarray is part of a dual-offset antenna system for a high-resolution and wide-swath Synthetic Aperture Radar (SAR) instrument that operates in both a high-resolution mode with…

Integrated design and analysis of large reflector antenna systems

For efficient integrated design and analysis of antenna systems consisting of waveguide harness, feed horns, and electrically large reflectors, a hybrid software has been developed. Herein, a higher-order Methods of Moments formulation using the Multi-Level Fast Multipole Method and a…

Optimization of feed chains and large reflectors

A higher-order Method of Moments formulation, accelerated with the Multi-Level Fast Multipole Method, and dedicated waveguide analysis methods constitute the foundation of efficient direct optimization of antenna systems consisting of feed chains and electrically large reflectors. A numerical example illustrates…

Direct optimization of electrically large reflectors and feed chains

The combination of a higher-order Method of Moments formulation and the Multi-Level Fast Multipole Method constitutes the foundation of an efficient direct optimization of reflector antenna systems consisting of feed chains and electrically large reflectors. Through a numerical example it…

Design of dual-band dual-polarized reflectarray for future multiple spot beam applications in Ka-band

The design of a parabolic polarization selective reflectarray for dual-band dual-circular polarization for multiple beam applications in Ka-band is presented. The reflectarray has a diameter of 0.65m and is a single-layer design consisting of rotated split hexagonal-loop dipole elements. For…

RF Design Tool for end-to-end Optimisation of High-performance Multibeam Antenna Systems

This paper describes a new integrated RF design tool for analysis and optimisation of reflector-based multibeam antenna systems. The new tool combines several powerful algorithms into a flexible software framework that allows end-to-end optimisation of antenna systems comprising of passive…

Direct optimization of quasi-periodic surfaces in multi-reflector systems

In recent years, there has been an increasing interest in replacing traditional periodic surfaces, e.g., frequency selective surfaces, with quasi-periodic surfaces (non-identical elements) in multi-reflector systems for satellite applications. Quasi-periodic surfaces can be used to improve existing antenna solutions or…

Advances in commercial software for high-gain antennas and electrically large platforms

We present the latest enhancements in the GRASP software package for analysis and design of electrically large antennas and platforms. The focus is on the hybridisation of efficient and accurate methods which allows antenna systems with very high complexity to…

Design of high-performance antenna systems with quasi-periodic surfaces

Periodic surfaces (identical array elements) have existed for several decades. However, in recent years, there is an interest in replacing such surfaces with quasi-periodic surfaces (non-identical array elements). Quasi-periodic surfaces provide additional degrees of freedom and can be used to…

Uncertainty quantification for reflector antennas

Large reflector antennas for telecommunication or space observation purposes often require a lengthy and detailed design process, where the design is carefully revised to ensure the best performance for the intended application. For many modern reflector antennas, quantification of the…

Advances on High-Performance Curved Reflectarrays for Telecommunication Applications

The latest advances on the use of curved reflectarrays for telecommunication applications is presented in this paper. For contoured beam applications, the curvature of the reflectarray surface can be used to enhance the bandwidth significantly, yielding reflectarray designs that can…

Design of Aperiodic Frequency Selective Surfaces for Compact Quasi-Optical Networks

The design of an aperiodic frequency selective surface (FSS) for compact quasi-optical networks is presented in this paper. Using a newly developed Physical Optics (PO) method in conjunction with a direct optimisation approach where all elements are simultaneously optimised, an…

Fast and Memory-Efficient Method for Full-Wave Analysis of Electrically Large Reflector Antennas and Satellite Platforms

We present a method that enables full-wave analysis of electrically large antennas and platforms, e.g., a detailed telecommunication satellite at Ka-band. Owing to the efficient formulation, even large problems can be solved on relatively modest computing platforms such as laptops…

Memory-efficient, full-wave analysis of waveguide scattering parameters for multiple reflector feeds mounted on electrically large satellite platforms

A Higher-Order Multilevel Fast Multipole Method (HO MLFMM) is presented for the efficient calculation of waveguide scattering parameters in cases where several reflector feeds are mounted on electrically large satellite platforms. The efficiency is obtained by: 1) using a Block…

New Analysis Capabilities for Electrically Large Antennas and Platforms

We present recent advances in the RF modelling of electrically large antennas and platforms, with an emphasis on reflector antennas and satellite platforms. The Higher-Order Multilevel Fast Multipole Method (HO MLFMM) was introduced recently in the commercial software tool GRASP,…

Investigations on the Analysis and Design of Aperiodic Frequency Selective Surfaces for Space Applications

An investigation on the design of aperiodic FSS is presented. First, an accurate yet efficient method which allows the analysis of finite sized aperiodic FSS has been developed. Subsequently, an optimisation method is implemented which optimises all the FSS elements…

DTU-ESA Millimeter-Wave Validation Standard Antenna (mm-VAST) – Detailed Design

This paper describes the structural solution to meet these extremely strict stability requirements and the structural analyses done in order to verify that they can be met. The paper also discusses the challenges of integrating an aluminum feed cluster with…

New Fast and Robust Modelling Algorithms for Electrically Large Antennas and Platforms

This paper presents two new modelling algorithms that were recently added to the commercially available GRASP software package for electrically large antenna and scattering problems. In particular, a new higher-order multilevel fast multipole solver (HO-MLFMM) provides very high simulation accuracy…

Fast and Accurate Analysis of Reflector Antennas with Struts and Satellite Platform Scattering

This paper presents two methods related to modelling of reflector antenna struts and surrounding structural features such as satellite platforms. One method is a MoM-based strut model and represents an improvement of an existing PO-based model, thus enabling analysis of…

DTU-ESA Millimeter-Wave Validation Standard Antenna – Requirements and Design

Inter-comparisons and validations of antenna measurement ranges are useful tools allowing the detection of various problems in the measurement procedures, thus leading to improvements of the measurement accuracy and facilitating better understanding of the measurement techniques. The maximum value from…

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