Claudius Loecker

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In this work the response of a phased-array antenna at a blind spot condition is enhanced by using a metamaterial based radome. By taking advantage of metamaterials one might be able to design ad-hoc impedance matching slab with uncommon constitutive parameters. To this end, classical transmission line models and novel retrieval techniques have been applied(More)
This paper presents an S-band AESA antenna with inexpensive T/R-modules and a novel RF feeding network operation technique. The antenna ports of the front-end's feeding network have no isolation mechanisms, which can be problematic in case of not well matched T/R-modules. However, a novel operation is proposed, and the issue is overcome. A system(More)
Conformal and structure integrated antennas mounted on aircraft will play an increasingly important role in future wireless systems. Such antennas have advantages against conventional antenna design but are subject to vibrations and deformations caused e.g. by aerodynamic loads, vehicle motion or moving parts such as the turbine or jet engine. Effects of(More)
In this work, a metaradome based on a fakir's bed of nails is designed and tested in order to suppress the blind directions of a 100-element antenna array. The antenna is a microstrip array designed to operate in X-band. The fakir's bed metamaterial-like was first approximated using analytical formulas before a full-wave numerical optimization. Experimental(More)
In this work, different approaches for enhancing radiation properties of phased-array antennas based on metamaterials (MTM) are presented. In case of antenna front-end technology, efforts have been done in designing metaradomes for mitigation of the blind-spot effect inherent to the periodic structure of phased arrays and in designing a compact series(More)
A series feeding network with dispersion engineered compensation lines to reduce beam-squint radiation in linear antenna applications is investigated. The compensation lines are loaded in sections with left-handed and right-handed unit cells and branch off the main feed line. The signals from the branch points to the antenna elements are slowed down(More)
Antenna arrays on aircrafts have several advantages if they will be integrated into the skin of the aircraft. However, conformal and structure integrated antennas are subject to aeordynamical loads which will cause vibrations and deformations of the antenna elements. This will lead to severe deviations of the phase information of the incoming and outgoing(More)
Beam steering and beam shaping with parasitic array antennas pose a suitable alternative to expensive phased array technology. Parasitic array antennas mainly consist of one or few active antenna elements which are surrounded by passive elements. The parasitic reactances of the passive elements can be controlled either by electronic tuning or switching.(More)
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