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This paper investigates a low complexity high gain structure that can switch the radiation pattern from boresight to almost endfire direction. The principles of Fabry Perot, reconfigurable parasitic reflectors and partially reflective surfaces are combined to achieve the pattern reconfigurability. Two different Fabry-Perot cavity spacings are assessed and a maximum gain of 18.8 dBi is achieved at...
Professor Per-Simon Kildal passed away on April 21, 2016, at age 65. Since 1989, he was a Professor with Chalmers University of Technology, Gothenburg, Sweden, where he led the Division of Antenna Systems of the Department of Signals and Systems. The life of Professor Kildal was dedicated to Science, Education and Engineering. This paper summarizes these three aspects of his life, starting from his...
In tne context of a growing interest in tne use of millimetre wave frequencies for railway applications, we propose to analyse the influence of this environment on antenna performances. The railway environment being quite harsh with the presence of lossy and conductive particles and elements, near-field effects can be detrimental to the efficiency of wireless links at these frequencies. This paper...
The paper deals with the extensive use of optimization techniques at Space Engineering during the several phases of development of antenna sub-systems for satellite applications.
This paper presents some of our antenna activities in the TT&C, GNSS and Data-Downlink area. Our involvement in such antenna designs spans over a 40 year period starting in the mid 70ies, first within the antenna group at LM Ericsson and Saab Ericsson, and now at RUAG [3].
An hybrid array fed reflector antenna solution is described in this paper, combining a focused geometry in one plane and an imaging (defocused) geometry in the orthogonal plane. This doubly curved reflector geometry can be combined with a stack of linear phased arrays, introducing some re-configurability at a moderate cost when compared to more conventional imaging reflector solutions using planar...
A unidirectional frequency reconfigurable bow-tie antenna array (FRBAA) is presented. The array employs four doubled-sided bow-tie antennas as the radiating elements. By controlling the states of the PIN diodes mounted on the radiators, three switchable operating bands can be achieved. In order to produce unidirectional radiation patterns with low profile and good impedance matching in all the bands,...
A new paradigm for the design of reflectarrays is introduced. The proposed methodology allows the designer to specify constraints/simplifications on the antenna surface current distribution thanks to an innovative exploitation the non-radiating (NR) component, which is regarded a powerful additional degree-of-freedom (DoF) in the synthesis process. An illustrative example is presented, aimed at nulling...
Per-Simon's rise to fame started at the Norwegian University of Science and Technology in Trondheim in the late 1970s. In this paper I will reflect on those years and how it may have shaped his career.
This work presents a study of the electromagnetic performance of classical and shaped omnidirectional dual-reflector antennas in millimeter waves. An algorithms based on the concatenation of conic sections has been used to synthesize sub- and main-reflectors in order to provide a uniform phase and amplitude aperture distributions. The frequency analysis is focused on antenna radiation patterns across...
This paper presents how several technological advancements in communication satellite antennas have been transferred to other applications and synergistically combined to enable significant reductions in the cost per billable bit of throughput.
This work presents the design and implementation of a phased array antenna for reconfigurable 5G backhaul network links. In order to minimize costs, the antenna has been developed using low cost RO4003 substrates and off the shelf electronic components. The antenna operates in Ka band (19 GHz) with scan range down to 50°.
To illuminate a certain footprint on Earth, a corresponding aperture distribution of the antenna in space needs to be generated. There are various possibilities to generate this distribution. A general classification is for example the distinction between direct radiation and radiation via reflecting apertures. The way in which the illumination is realised is directly linked to the complexity of the...
This paper presents an overview of the advances in single layer reflectarrays. In particular, it reports the progress in wideband reflectarrays and reconfigurable reflectarrays.
Having a robust architecture against tolerances is one of the most important aspects in high frequency antenna design. In this paper, the effect of the fabrication errors on the power pattern of reflectarray antenna is investigated. The uncertainty on the actual size of the patch width is modeled as an interval value. The rules of Interval Analysis (IA) and Interval Arithmetic are then exploited to...
In this paper, size reduction of antenna structures taking reflection response and total efficiency into account has been investigated. In order to find available design trade-offs concerning the antenna footprint, its wideband matching, and efficiency, numerical optimization has been employed. Appropriate formulation of the objective function permits identification of the designs that exhibit the...
MWI (Micro Wave Imager) is a multi-channel microwave radiometer which will be embarked on the next MetOp-SG (MetOp Second Generation) mission aimed to provide cloud and precipitation observations as well as water vapour and temperature gross profiles. MetOp-SG includes two series of three satellites, embarking a total of 10 different instruments. The satellites are procured by the European Space Agency...
This paper presents recent developments in Liquid Crystal-based reflectarray antennas for mm-wave applications, future perspectives for this technology and its particular use in SATCOM applications.
A novel Phoenix cell for large band reflectarray antennas is presented here. The cell starts with a simple square patch whose phase shift is controlled by its sides' length. The size of the patch is then fixed and open-stubs with variable length are connected to it. To complete the phase range at the central frequency, the stub-loaded patch then shrinks gradually until it disappears completely allowing...
Professor Per-Simon Kildal passed away on April 21, 2016, after a very short period of illness. He was born on July 4, 1951. He chaired the Division of Antenna Systems of the Department of Signals and Systems at Chalmers University of Technology. He authored an antenna textbook and many journal articles and conference papers. He designed two very large antennas, including the Gregorian dual-reflector...
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