Categories

249479

Research outputs

As an application-oriented research organisation, Fraunhofer aims to conduct highly innovative and solution-oriented research - for the benefit of society and to strengthen the German and European economy.

13035

Projects

Fraunhofer is tackling the current challenges facing industry head on. By pooling their expertise and involving industrial partners at an early stage, the Fraunhofer Institutes involved in the projects aim to turn original scientific ideas into marketable products as quickly as possible.

9055

Researchers

Scientific achievement and practical relevance are not opposites - at Fraunhofer they are mutually dependent. Thanks to the close organisational links between Fraunhofer Institutes and universities, science at Fraunhofer is conducted at an internationally first-class level.

77

Institutes

The Fraunhofer-Gesellschaft is the leading organisation for applied research in Europe. Institutes and research facilities work under its umbrella at various locations throughout Germany.

Recent Additions

Most viewed

  • Publication
    Investigations of active antenna doherty power amplifier modules under beam-steering mismatch
    This letter investigates the performance of a Doherty power amplifier (DPA) in an 8 x 1 active antenna transmitter module under an average voltage-standing-wave ratio of 4 : 1 induced by the array 1-D beam steering and mutual coupling. The GaN based DPA and a 2 x 1 segment of the array are verified via measurements at the operating frequency of 3.5 GHz. The co design and co-simulation of both the antenna array and the behavioral model of the DPA show that the inherent back-off efficiency benefit-when compared to traditionally used class-AB and -B amplifiers in base stations-can be maintained when restricting the beam-steering angle, in this case theta is an element of [-45 degrees, 45 degrees], and operational bandwidth of the combined system.
  • Publication
    Automating compositional safety analysis using a failure type taxonomy for component fault trees
    ( 2017)
    Möhrle, F.
    ;
    Zeller, M.
    ;
    Höfig, K.
    ;
    Rothfelder, M.
    ;
    Liggesmeyer, P.
    Safety assurance is a major challenge in the design of today's complex embedded systems and future Cyber-physical systems. Changes in a system's architectural design invalidate former safety analyses and require a manual adaptation of related safety analysis models in order to restore consistency. In this work, we present an approach for automating the compositional assembly of Component Fault Trees by automatically generating mappings between their input and output failure modes. Therefore, we propose a taxonomy of failure types for annotating model elements and deriving a model of the failure propagation. This way, automatic and system-wide safety analyses can be executed and easily repeated after making modifications to the system's architecture. We demonstrate the feasibility of our approach using an example ethylene vaporization unit from an industrial domain.
  • Journal